Mr. Dennis Pittenger

Area Environmental Horticulturist, Emeritus

Botany & Plant Sciences
2150 Batchelor Hall
Riverside, CA 92521-0124
(951) 236-9723
drpittenger@ucdavis.edu

http://www.plantbiology.ucr.edu/

http://www.ucanr.edu/cluh

Also in:
Los Angeles County

Biography

Dennis retired in July 2017 after 36 years of service with the University.  He was granted emeritus status and continues to write and consult on topics related to urban and environmental horticulture, particularly landscape water management.  During his career, Dennis supported and worked closely with green industry groups, U.C. Cooperative Extension colleagues, and U.C. campus-based faculty to organize educational events for landscape-related professionals, retail nursery professionals, agencies, and the public.  He also conducted field research projects, and prepared educational materials that interpreted research results and science-based information.  His educational and applied research programs centered on helping the landscape industry and associated agencies in Southern California resolve problems in managing and using woody plants in urban areas, particularly in landscape water management.  Tree species selection, culture of landscape palms, and managing tree roots and groundcovers were also issues addressed by his programs. Dennis is the technical editor and a contributing author for two editions of the California Master Gardener Handbook, which is an award-winning, comprehensive reference on basic horticulture from the University of California.

Education

M.S. Horticulture, Ohio State University. 1977

B.S. Agriculture, Ohio State University. 1975

Specialty

Areas of Expertise (click to see all ANR academics with this expertise)

• Ornamental Crops, Landscape and Turf
• Landscape - General
• Plants and Their Systems
• Natural Resources and Environment
• Conservation and Efficient Use of Water

Bibliography

Non-Peer Reviewed

• Karlik, J. F. and Pittenger, D. R. (In Press). Ubran trees and ozone formation : a consideration for large-scale plantings. Oakland, University of California Division of Agriculture and Natural Resources Publication 8482.
• Pittenger, D. R. (209, 209). "Questions and answers about water conservation and drought in the landscape." from http://ucanr.org/sites/UrbanHort/.
• Pittenger, D. R. (2011). Evaluation of interspecific Hybrid Pears for Use in Southern California Landscapes. HortScience. 46:9, S95-96. 2011.
• Baird, J. (2011). Groundcover response to limited irrigation. University of California, Riverside, CA.
• Shaw, D. A. (2011). managing the root environment. San Diego, CA.
• Pittenger, D. R. (2011). Preventing water waste in the home garden. UC ANR Spanish-Language Outreach Radio Release. 2011.
• Pittenger, D. R. (2010). Better use of water for home garden irrigation. UC ANR Spanish-Language Outreach Radio Release. August 2010.
• Pittenger, D. R. (2010). Choosing a Christmas Tree. UC ANR Spanish-Language Outreach Radio Release. December 2010.
• Hodel, D. R. ; Downer, A. J., et al.; Pittenger, D. R. (2010). Effect of sand backfill on transplanted palms. HortScience. 45:8, S92. 2010.
• Hodel, D. R.; Downer, A. J., et al.; Pittenger, D. R. (2010). Effects of leaf removal and tie-up on large, mature date palms transplanted in extremely hot conditions. HortScience. 45:8, S91-92. 2010.
• Pittenger, D. R.; Shaw, D. A. (2010). Estimating water needs of urban landscapes. HortScience. 45:8, S96. 2010.
• Pittenger, D. R. (2010). Evaluation of interspecific hybrid pears for use in Southern California landscapes. 15 pp. September.
• Pittenger, D. R. (2010). Freshness of a Christmas tree. UC ANR Spanish-Language Outreach Radio Release. December 2010.
• Pittenger, D. R. (2010). Getting a fresh Christmas Tree. UC ANR Spanish-Language Outreach Radio Release. December 2010.
• Baird, J. (2010). Groundcovers for water conserving landscapes. University of California, Riverside, CA.
• Pittenger, D. R.; Kim, D. (2010). Holiday plants last longer with care. UC ANR Spanish-Language Outreach Print Release. December 2010.
• Pittenger, D. R.; Kim, D. (2010). Holiday plants last longer with care. UC ANR News and Information Outreach Release. November 23, 2010.
• Pittenger, D. R. (2010). Keeping a Christmas tree fresh. UC ANR Spanish-Language Outreach Radio Release. December 2010.
• Pittenger, D. R. (2010). Lawn care made simple--summer lawn watering. Sunnymead ranch Planned Community Assoc. 10. June 2010.
• Pittenger, D. R. (2010). Let's do out part to overcome the drought. UC ANR Spanish-Language Outreach Print and Video Release. 2010.
• Pittenger, D. R. (2010). Planting a live Christmas Tree in your garden. UC ANR Spanish-Language Outreach Radio Release. December 2010.
• Pittenger, D. R. (2010, 2010). "Selecting a smart irrigation controller." from http://ucanr.org/sites/UrbanHort/.
• Pittenger, D. R. (2010). Tips for selecting a live Christmas tree. UC ANR Spanish-Language Radio Release. December 2010.
• Pittenger, D. R. (2009, 2009). "Dealing with mandatory water restrictions." from http://ucanr.org/sites/UrbanHort/.
• Pittenger, D. R. (2009, 2009). "Easy calculators for estimating landscape water needs." from http://ucanr.org/sites/UrbanHort/.
• Hodel, D. R.; Downer, A. J., et al.; Pittenger, D. R. (2009). Effect of sand backfill on transplanted palms. University of California, Agriculture and natural Resources. 10 pp. 2009. http://groups.ucanr.org/slosson/documents/newsletter1713.htm
• Pittenger, D. R. (2009, 2009). "Estimating evapotranspiration ET." from http://ucanr.org/sites/UrbanHort/.
• Pittenger, D. R. (2009, 2009). "Estimating turfgrass needs." from http://ucanr.org/sites/UrbanHort/.
• Pittenger, D. R.; Downer, A. J., et al.; Hodel, D. R.; Mochizuki, M. (2009). "Estimating Water Needs of Landscape Palms in Mediterranean Climates." 19(4): 700-704.
• Pittenger, D. R. (2009, 2009). "Estimating wtaer needs of landscape plants and entire landscapes." from http://ucanr.org/sites/UrbanHort/.
• J. Werner (2009). Frequently asked questions: water conservation and drought management in the landscape. UC ANR News and Information outreach Print Drought Media Kit. 2009.
• Baird, J. (2009). Groundcovers for water conserving landscapes. University of California, Riverside, CA.
• Pittenger, D. R. (2009, 2009). "How plants use water." from http://ucanr.org/sites/UrbanHort/.
• J. Werner (2009). How to save lots of water in lawns and landscapes without replacing them. UC ANR News and Information Outreach Pring Drought Media Kit. 2009.
• Shaw, D. A. and Pittenger, D. R. (2009). Landscape irrigation system evaluation and management--workshop and training syllabus. University of California Cooperative Extension San Diego County.
• Pittenger, D. R. (2009). Lawn water use tips. UC ANR Spanish-Language Outreach Print Drought Media Kit. July 2010.
• Pittenger, D. R. (2009). Responding to water restrictions. 16:8, 1, 10. 2009.
• Pittenger, D. J. and Hodel, D. (2009). "Six-year evaluation of circular root barriers on two tree species." 35(1): 41-46.
• Hodel, D. R.; Downer, A. J., et al.; Pittenger, D. R. (2009). "Transplanting Palms." 19(4): 686-689.
• Pittenger, D. R. (2009, 2009). "Understanding soil water holding characteristics." from http://ucanr.org/sites/UrbanHort/.
• Pittenger, D. R. (2009, 2009). "Using ET data to estimate turfgrass and landscape plants' water needs." from http://ucanr.org/sites/UrbanHort/.
• Pittenger, D. R. (2009, 2009). "Water needs of landscape plants."
• Pittenger, D. R. (2008). Caring for fresh-cut flowers this Mother's Day. Los Angeles County, University of California Coop. Ext. 2008.
• Hilaire, R. S.; Arnold, M. A., et al.; Wilkerson, D. C.; Devitt, D. A.; Hurd, B. H.; Lesikar, B. J.; Lohr, V. I.; Martin, C. A.; McDonald, G. V.; Morris, R. L.; Pittenger, D. R.; Shaw, D. A.; Zoldoske, D. F. (2008). "Efficient Water Use in Residential Urban Landscapes." 43(7): 2081-2092.
• Pittenger, D. R.; Downer, A. J., et al.; Hodel, D. R. (2008). Estimating water needs of landscape palms. HortScience. 43:4, 1060. 2008.
• Pittenger, D. R. (2008). Makingsense of amendments. 15:3, 1, 14. 2008.
• Downer, A. J.; Hodel, D. R., et al.; Pittenger, D. R. (2008). Pruning palms. HortScience. 43:4, 1060. 2008.
• Hodel, D. R.; Downer, A. J., et al.; Pittenger, D. R. (2008). Transplanting and planting palms. HortScience. 43:4, 1060. 2008.
• Baird, J. (2008). Water needs of landscape plants. University of California, Riverside, CA.
• Wu, L. (2007). Conserving wate rby understanding water needs of landscape plants. Woodland, CA. April 19, 2007.
• Downer, A. J.; Hodel, D. R., et al.; Pittenger, D. R. (2007). Poor Postharvest Handling and storage of transplanted. HortScience. 42:4, 978. 2007.
• Hodel, D. R., Downer, A. J., and Pittenger, D. R. (2007). "Recent palm horticultural research at the University of California." 187: 39-44.
• Pittenger, D. R. (2006-present, 2006-present). "Center for Landscape and urban Horticulture." from
• Pittenger, D. R. (2006). Diagnosing plant problems. Oakland, University of California Division of Agriculture and Natural Resources Publication 3492.
• Hodel, D. R.; Downer, A. J., et al.; Pittenger, D. R.; Beaudoin, P. J. (2006). "Effect of amended backfill soils when planting five species of palms." 16(3): 457-460.
• Pittenger, D. R. and Gay, R. (2006). House plants. Oakland, University of California Division of Agriculture and Natural Resources Publication 3492.
• Pittenger, D. R. (2006). Implementation of statewide landscape irrigation management recommendations. 8, 14-16. 2006.
• Pittenger, D. R. (2006). Introduction to Horticulture. Oakland, University of California Division of Agriculture and Natural Resources Publication 3492.
• Gan, J., Wilen, C., and Pittenger D. R. (2006). Landscape pesticides and surface water qualitiy. 1, 1-3. 2006.
• Hodel, D. R., Downer, J., Pittenger, D. R. (2006). Palm Research Compendium. University of California Cooperative Extension Ventura and Los Angeles Counties.
• Pittenger, D. R. (2006). Retail Garden Center Manual. Oakland, University of California Division of Agriculture and Natural Resources Publication 3492.
• Hodel, D. R., and Pittenger, D. R. (2006). Woody landscape plants. Oakland, University of California Division of Agriculture and Natural Resources Publication 3492.
• Merhaut, D. and Pittenger, D. R. (2005). A snapshot of California's wholesale nursery industry. 7, 1-7. 2005.
• Pittenger, D. R. and Stamen, T. (2005). "Effectiveness of Methods Used to Reduce Harful Effects of Compacted Soil Around Landscape Trees." 31(3): 62-64.
• Pittenger, D. R.; Shaw, D. A., et al.; Richie, W. E. (2005). Evaluation of weather-sensing landscape irrigation controllers. HortScience. 40:4, 1078. 2005.
• Pittenger, D. R., Garrison, N. F., Geisel, P. M., and Unruh, C. (2005). Growing tomatoes in the home garden. Oakland, University of California Division of Agriculture and Natural Resources Publication 8159.
• Pittenger, D. R. (2005). Managing water: reduced stress means optimal growth. 16:11, 64-68, 70. 2005.
• Merhaut, D. J. and Pittenger, D. R. (2005). "Marketing trends and business management practices for the whoelsale nursery industry in California." 15(2): 381-385.
• Hodel, D. R., Pittenger, D. R., and Downer, A. J. (2005). "Palm root growth and implications for transplanting." 31(4): 171.
• Pittenger, D. R.; Hodel, D. R., et al.; Downer, A. J. (2005). "Transplanting specimen palms: A review of common practices and research-based information." 15(1): 128-132.
• Shaw, D. A.; Pittenger, D. R., et al.; McMaster, M. (2005). Water Retention and Evaporative properties of Landscape Mulches. Phoenix, AZ.
• Pittenger, D. R., Shaw, D. A., and Skindrud, E. (2005). Water-saving irrigation controllers: put to the test. November. 2005.
• Pittenger, D. R., Shaw, D. A., and Skindrud, E. (2005). Water-saving irrigation controllers: put to the test. December. 2005.
• Pittenger, D. R., Shaw, D. A., and Skindrud, E. (2005). Water-saving irrigation controllers: put to the test. 2005. http://www.landscapeonline.com/research/article/6038
• Pittenger, D. R., Shaw. D., and Richie, W. E. (2004). Background and evaluation of weather-sensing landscape irrigation controllers. 6, 2-6. 2004.
• Henry, J. M.; Pittenger, D. R., et al.; Snyder, R. L. (2004). Determining evapotranspiration using temporary weather stations. 34 pp. April 2004.
• Pittenger, D. R.; Shaw, D. A., et al.; Richie, W. E. (2004). Evaluation of weather-sensing landscape irrigation controllers. 25 pp. June. www.ucanr.org/cluh
• Shaw, D. A.; Pittenger, D. R. (2004). Landscape species performance under irrigation levels based on reference evapotranspiration. Tampa, FL.
• Shaw, D. A. and Pittenger, D. R. (2004). "Performance of landscape ornamentals given irrigation treatments based on reference evapotranspiration." 664: 607-613.
• Shaw, D. A. (2004). Transplanting specimen palms: a Review of Common Practices and Research-Based Information. San Diego, CA.
• Pittenger, D. R. (2004). Western weater situation. 6, 1-2. 2004.
• Pittenger, D. R. and Shaw, D. (2004). What we know about landscape water requirements. 6, 1-4. 2004.
• Pittenger, D. R.; Merhaut, D. J. (2003-2006). CO-HORT. 5-8. 2003-2006.
• Pittenger, D. R. (2003-2005). Spanish-language Urban Horticulture Radio Features. ANR Spanish Broadcast & Media Services by A. Hauffen. 2003-2005.
• Hodel, D. R., Pittenger, D. R., James Downer, A., and Richie, W. E. (2003). "Effect of Leaf Removal and Tie Up on Juvenile, Transplanted Canary Island (." 47(4): 177-184.
• Gan, J., Zhu, Y., Wilen, C., Pittenger, D. R., and Crowley, D. (2003). "Effect of Planting Covers on herbicide Persistence in landscape Soils." 37(12): 2775-2779.
• Gan, J.; Wilen, C., et al.; Pittenger, D. R. (2003). Landscape Herbicides: What happens after application?
• Shaw, D. A.; Pittenger, D. R. (2003). Performance of landscape ornamentals given irrigation treatments based on reference evapotranspiration. Davis, CA. September 1-5, 2003.
• Hodel, D. R.; Pittenger, D. R. (2003). Root system regeneration and resprouting of cut roots in palms (aracaceae). Rancho Santa Ana Botanicle Garden, Claremont, CA. March 30-April 5, 2003.
• Hodel, D. R. and Pittenger, D. R. (2003). "Studies on the Establishment of Date Palm (." 47(4): 201-205.
• Hodel, D. R. and Pittenger, D. R. (2003). "Studies on the Establishment of Date Palm (." 47(4): 191-200.
• Pittenger, D. R.; Pittenger, D. R. (2003). Transplanting palms: effects of leaf removal and tie-up. Univeristy of California, Riverside. 5-6. September 24, 2002.
• Pittenger, D. R.; Hodel, D. R., et al.; Downer, A. J. (2003). Transplanting specimen palms: common practices and research-based information. HortScience. 38:5, 836. 2003.
• Pittenger, D. R. (2003). What we know about landscape water requirements. March/April, 28-29. March/April.
• Pittenger, D. R. (2003). What we know about landscape water requirements. July, 40-41. July.
• Pittenger, D. R., and Downer, J. (2002-2003). The herbicide-contaminated compost issue. 16, 5, 1-4, 1-5. 2002-2003.
• Pittenger, D. R. (2002). Appendix B--useful conversions. Oakland, University of California Division of Agriculture and Natural Resources Publication 3382.: 669-672.
• Pittenger, D. R. (2002). Diagnosing plant problems. Oakland, University of California Division of Agriculture and Natural Resources Publication 3382.: 651-660.
• Pittenger, D. R.; Richie, W. E., et al.; Green, R. L.; Hartin, J. S. (2002). Evaluating irrigation needs of mixed landscapes for water conservation. 150 pp. 1997-2000.
• Pittenger, D. R. (2002). facts and information related to the Coachella Valley environmental horticulture industry. Coop. Ext./Western Coordinating Committee 58. 12. 2002.
• Pittenger, D. R. (2002). Glossary. Oakland, University of California Division of Agriculture and Natural Resources Publication 3382.: 673-684.
• Garrison, N. and Pittenger, D. R. (2002). Home vegetable gardening. Oakland, University of California Division of Agriculture and Natural Resources Publication 3382.
• Gay, R. C. and Pittenger, D. R. (2002). House plants. Oakland, University of California Division of Agriculture and Natural Resources Publication 3382.: 271-294.
• Pittenger, D. R. (2002). Introduction to horticulture:what plants are, how they grow, how they function. Oakland, University of California Division of Agriculture and Natural Resources Publication 3382.: 5-28.
• Pittenger, D. R. (2002). Overview of the California master Gardener Program. Oakland, University of California Division of Agriculture and Natural Resources Publication 3382.: 1-4.
• Pittenger, D. R.; Richie, W. E., et al.; Hodel, D. R. (2002). Performance and quality of landscape tree species under two irrigation regimes. 1996-2000.
• Pittenger, D. R. (2002). The California Master Gardener Handbook. Oakland, University of California Division of Agriculture and natural Resources Publication 3382.
• Pittenger, D. R. and Downer, A. J. (2002). The herbicide-contaminated compost issue. November/December, 32-34. 2002.
• Pittenger, D. R.; Gibeault, V. A. (2002). Turfgrass and Landscape Management Field Day. University of California, Riverside.
• Hodel, D. R. and Pittenger, D. R. (2002). Woody landscape plants: selection, planting and care. Oakland, University of California Division of Agriculture and Natural Resources Publication 3382.: 331-336.
• Pittenger, D. R. (2001-2002). Urband Horticulture Radio Features. ANR Communication Services-Broadcast Media by R. Singleton. 2001-2002.
• Pittenger, D. R.; Pittenger, D. R. (2001). Applications of recent research in ladnscape irrigation management. University of California, Riverside. 17-18. September 18, 2001.
• Hartin, J. S., Pittenger, D. R., and Henry, J. M. (2001). Best management practices to reduce production of organic materials in landscape plantings. 8:1-2, 1-6. 2001.
• Pittenger, D. R., Shaw, D. A., Hodel, D. R., and Holt, D. B. (2001). "Responses of Landscape Groundcovers to Minimus Irrigation." 19(2): 78-84.
• Downer, A. J.; Pittenger, D. R., et al.; Hodel, D. R. (2001). Root regeneration of landscape palms. HortScience. 36:3, 430. 2001.
• McPherson, E. G., Simpson, J. R., Peper, P. J., Xiao, Q., Pittenger, D. R., Hodel, D. R. (2001). Tree guidelines for Inland Empire communities. Sacramento, CA, Local Government commission.
• Pittenger, D. R.; Gibeault, V. A. (2001). Turfgrass and Landscape Management Field Day. University of California, Riverside.
• Hartin, J. S., Pittenger, D. R., and Henry, J. M. (2000). Basic plant management techniques--part I. 9:11, 1-8. 2000.
• Hartin, J. S.; Pittenger, D. R., et al.; Henry, J. M. (2000). Best management practices to reduce production of organic materials in landscape plantings. San Bernadino, University of California Coop. Ext. California integrated Waste Managment Board. 2000.
• Shchuch, U. K., Pittenger, D. R., and Barker, P. A. (2000). "Comparing Effects of Container Treatments on Nursery Production and Field Establishment of Trees with Different Root Systems." 18(2): 83-88.
• Pittenger, D. R. (2000). Effective tree planting practices. University of California, Riverside. 22. September 13, 2000.
• Pittenger, D. R. (2000). Greening Our Future: a synopsis of mycorrhizal research in trees. 26:1, 16. 2000.
• Pittenger, D. R. (2000). Growing Tomatoes. Los Angeles County, University of California Coop. Ext. Garden Information Series. 2000.
• Pittenger, D. R. (2000). Landscape Management Research Conference and Field Day. University of California, Riverside.
• Pittenger, D. R. (2000). Mixed ladnscape irrigation findings. University of California, Riverside. 14-15. September 13, 2000.
• Pittenger, D. R.; Downer, A. J., et al.; Hodel, D. R. (2000). Palm Root Regeneration and its significance in transplanting. Gresham, OR.
• Shaw, D. A. (2000). Palm root regeneration and transplanting. San Diego, CA.
• Pittenger, D. R. (2000). Research on palm root systems. University of California, Riverside. 20. September 13, 2000.
• Pittenger, D. R. (2000). Soil and water management for vegetable gardens. Los Angeles County, University of California Coop. Ext. Garden Information Series. 2000.
• Green, R. L., Pittenger, D. R., and Gibeault, V. A. (2000). The benefits of urban landscapes and the need for water conservation. 7:3, 9-11. 2000.
• Pittenger, D. R. (2000). When and how to amend landscape soils. Los Angeles County, University of California Coop. Ext. Garden Information Series. 2000.
• Pittenger, D. R. (1999). Amend the soil: when and how. 6:4, 6-7. 1999.
• Pittenger, D. R. (1999). Effects of root barriers on tree adn root growth. University of California, Riverside. 1-2. September 15, 1999.
• Pittenger, D. R. (1999). Evaluation of landscape tree species. University of California, Riverside. 17-20. September 15, 1999.
• Pittenger, D. R. (1999). Impact of container size on future growth rates of landscape trees. Uniersity of California, Riverside. 3-4. September 15, 1999.
• Pittenger, D. R. (1999). Landscape Management Research Conference and Field Day. University of California, Riverside.
• Shaw, D. A. (1999). Recycled Water Quality. San Diego, CA.
• Green, R. L.; Pittenger, D. R., et al.; Richie, W. E. (1999). Turfgrass and Landscape Irrigation Studies. 127 pp. 1999.
• Pittenger, D. R. (1999). Weed barriers and herbicides for landscape weed control. University of California, Riverside. 10-12. September 15, 1999.
• Pittenger, D. R. (1998-2000). Urban Horticulture Radio Features. 1998-2000.
• Pittenger, D. R. (1998). A photo CD of herbicide damage symptoms on ornamentals. 4, 8. 1998.
• Gibeault, V. A. (1998). Irrigation management of Mixed Landscapes. University of California, Riverside. 35-37. September 16, 1999.
• Pittenger, D. R. (1998). Landscape Management Research Conference and Field Day. University of California, Riverside.
• Neely, D.; Neely, D. (1998). Palm root regeneration. San Francisco, CA.
• Pittenger, D. R., Braman, S. K., Kabashima, J. N., and Shaw, D. A. (1998). "Reducing pesticides in urban landscapes. Proc. of Workshop at 1995 Annual Conference of American Soc. for Hort. Sci., Montreal, Can." 8(2): 143-158.
• Pittenger, D. R. (1998). Root barriers. University of Hawaii at Manoa Coop. Ext. Service. 3, 6. 1998.
• Downer, A. J. (1998). Strategies for managing tree roots in urban landscapes. Oak View, CA.
• Shaw, D. A. (1998). Trees for dry environments. San Diego, CA.
• Green, R. L.; Pittenger, D. R., et al.; Richie, W. E. (1998). Turfgrass and Landscape Irrigatoin Studies. 129 pp. 1998.
• Pittenger, D. R. (1997). Avoiding the great barrier grief. 17:6, 18-20. 1997.
• Shaw, D. A.; Pittenger, D. R., et al.; Sachs, R.; Richter, M.; Mazalewski, R. (1997). Drip irrigation of shrubs and groundcovers. University of California, Riverside. 9-10. September 18, 1997.
• Pittenger, D. R.; Hodel, D. R. (1997). Excavation of tree root barriers. University of California, Riverside. 20-21. September 18, 1997.
• Hartin, J. S.; Pittenger, D. R. (1997). Growth of landscape trees platned from three container sizes. University of California, Riverside. 19. September 18, 1997.
• Pittenger, D. R. (1997). Internet resources for horticultural sceince information. 3, 1-2. 1997.
• Pittenger, D. R. (1997). Landscape Management Research Conference and Field Day. University of California, Riverside.
• Hodel, D. R.; Downer, A. J., et al.; Pittenger, D. R. (1997). Palm root regeneration study. University of California, Riverside. 7-8. September 18, 1997.
• Kjelgren, R.; Pittenger, D. R. (1997). Precision landscape irrigation management. Logan, UT: Dept. of Plants, Soil, and Biometeorology, Utah State University. 1997.
• Green, R. L.; Pittenger, D. R., et al.; Gibeault, V. A.; Richie, W. E. (1997). The development of efficient landscape and turfgrass irrigation practices. 89 pp. 1997.
• Pittenger, D. R. (1997). The politics and practices of landscape water conservation regulation. 3, 12-13. 1997.
• Richie, W. E.; Pittenger, D. R. (1997). Update on landscape water requirements study. Univeristy of California, Riverside. 13. September 18, 1997.
• Wilen, C. A.; Holt, D. B., et al.; Pittenger, D. R.; Mabie, R. (1997). Weed barriers and herbicides for landscape weed control. University of California, Riverside. 11-12. September 18, 1997.
• Gibeault, V. A.; Green, R. L., et al.; Pittenger, D. R. (1996). A turf, shrub, and groundcover landscape water conservation study. 119 pp. 1996.
• Pittenger, D. R. (1996). Bacterial leaf scorch of oleander--a newly identified disorder in California. 2, 5-6. 1996.
• Richie, W. E.; Pittenger, D. R. (1996). Determining landscape water requirments. University of California, Riverside. 17-18. September 18, 1996.
• Pittenger, D. R.; Schuch, U. K. (1996). Effects of size, shape, and copper coatings of nursery containers on tree root development. University of California, Riverside. 11-12. September 18, 1996.
• Pittenger, D. R. (1996). Landscape management research conference and field day. University of California, Riverside.
• Pittenger, D. R. (1996). Lotusland: a photographic odyssey.
• Pittenger, D. R. (1996). Measuring light in horticulture. 2, 6-8. 1996.
• Pittenger, D. R. (1996). Ornamentals need balanced nutrition. Calif Fertilizer Assoc. May, 5-6. May 1996.
• Pittenger, D. R. (1996). Performance of six groundcover species under minimum irrigation. San Jose, CA. 50. June 23-27.
• Hodel, D. R., and Pittenger, D. R. (1996). "Root and Shoot Growth of Eucalyptus in Response to Container Configuration and Copper Carbonate." 31(1): 165.
• Schuch, U. K.; Pittenger, D. R. (1996). "Root and shoot growth of eucalyptus in response to container configuration and copper carbonate." 31(1): 165-165.
• Pittenger, D. R.; Hodel, D. (1996). Tree root barrier study. University of California, Riverside. 13-14. September 18, 1996.
• Pittenger, D. R.; Schuch, U. K., et al.; Gibeault, V. A. (1995-1998). CO-HORT. 1-4. 1995-1998.
• Gibeault, V. A.; Green, R. L., et al.; Pittenger, D. R. (1995). A turf, shrub, and groundcover landscape water conservation research study. 110 pp. 1995.
• Pittenger, D. R. (1995). Autumn color of trees. 1, 5. 1995.
• Pittenger, D. R. (1995). Diagnosing abiotic tree disorders. San Diego, CA, University of California Coop. Ext.
• Hodel, D. R. and Pittenger, D. R. (1995). For healthy ground covers: mow. 30:5, c-2,4,6. 1995.
• Pittenger, D. R.; Shaw, D. A., et al.; Hodel, D. R.; Richie, W. E. (1995). Influence of irrigation scheduling on ground cover performance. HortScience. 30:4, 799. 1995.
• Pittenger, D. R. (1995). Landscape Management Resarch Conference and Field Day. University of California, Landscape.
• Pittenger, D. R. (1995). Preventing graffiti by design. 1, 3-4. 1995.
• Richie, W. E., Pittenger, D. R., Hodel, D. R., Shaw, A., and Holt, D. B. (1995). Summary of irrigation management studies on groundcovers. 1, 6-7. 1995.
• Pittenger, D. R. (1995). The controversy over trees' contribution to air pollution. 1, 7-8. 1995.
• Gibeault, V. A.; Green, R. L., et al.; Pittenger, D. R. (1994). A turf, shrub, and groundcover water conservation resarch study. 104 pp. 1994.
• Schuch, U. K.; Pittenger, D. R. (1994). Container shape, size and cupric hydroxide coating affect root and shoot growth of ficus and pepper trees. HortScience. 29:5, 481. 1994.
• Pittenger, D. R. (1994). Journal of Home and Consumer Horticulture.
• Pittenger, D. R. (1994). Landscape Management Research Conference and Field Day. University of California, Riverside.
• Pittenger, D. R. (1994). Landscape Management Research Conference and Field Day. University of California, Riverside.
• Downer, A. J.; Shaw, M., et al.; Pittenger, D. R. (1994). The effect of pruning on branch growth in two oak species. HortScience. 29:5, 550. 1994.
• et al. (1993, revised 2001). The resource recovery handbook. Sacramento, CA, California Landscape Contractors Association.
• Schuch, U. K. (1993). Findings of the U.S. EPA's nathional home and garden pesticide use survey. Riverside, CA.
• Pittenger, D. R. (1993). Getting to the root of your problem: root system structure, function, and management. San Diego, CA.
• Hodel, D. R.; Pittenger, D. R. (1993). Palm Mangement and Culture Seminar. Riverside, CA.
• Downer, A. J.; Pittenger, D. R., et al.; Faber, B.; Rogers, P. (1993). Sewage sludge increases yield and color of perennial ryegrass when added to yardwaste composts. HortScience. 28:5, 541. 1993.
• Shaw, D. A. (1993). Winter irrigation of urban forests with reclaimed water. 201-205 pp. 1993.
• Downer, A. J.; Faber, B., et al.; Schuch, U. K.; Pittenger, D. R.; White, R. (1992). Composted and fresh eucalyptus chip mulches promote early establishment of California sycamore. HortScience. 27:6, 686. 1992.
• Pain, T. D., Hanlon, C. C., Pittenger, D. R., Ferrin, D. M., and Malinoski, M. K. (1992). "Consequences of Water and Nitrogen Management on Growth and Aesthetic Quality of Drought-Tolerant Woody Landscape Plants." 10(2): 94-99.
• Pittenger, D. R., et al. (1992). Determination of minimum irrigation needs of non-turf groundcovers in the landscape. 24 pp. August.
• UC (1992). Home vegetable gardening. University of California DANR. 72. 1992.
• Pittenger, D. R. (1992). Landscape Management Research Conference and Field Day. Univeristy of California, Riverside.
• Pittenger, D. R.; Hodel, D. R., et al.; Shaw, D. A.; Holt, D. B. (1992). Minimum irrigation of groundcovers`. HortScience. 27:6, 570. 1992.
• Pittenger, D. R. (1992). Plants suggested for providing and aesthetic means of deterring graffiti. Coop. Ext. 1. 1992.
• Hodel, D. R.; Pittenger, D. R. (1992). Responses of groundcovers to renovation by mowing. HortScience. 27:6, 631. 1992.
• Varcoe, K. P (1991). A cost/benefit perspective of urban landscapes. Riverside, CA.
• Pittenger, D. R. (1991). A few common questions and answers. UC DANR Misc. 4. 1991.
• Pittenger, D. R., et al. (1991). A review of the communication needs of Cooperative Extension Advisors and Specialists. 7 pp. October 14, 1991.
• Pittenger, D. R. (1991). Can you save water with groundcovers? Sacramento, CA.
• Pittenger, D. R.; Hodel, D. R., et al.; Shaw, D. A.; Meyer, J. L. (1991). Determination of minimum irrigation needs of non-turf groundcovers in the landscape. U.C. Water Res. Cetner. 7 pp. June 1991.
• Pittenger, D. R., Gibeault, V. A., and Cockerham, S. T. (1991). "Environmental Horticulture: Growth Industry in California." 45(3): 15-19.
• Pittenger, D. R. (1991). Realities of landscape water requirements and irrigation. Palm Springs, CA.
• Pittenger, D. R. (1991). Research report: A survey of home gardeners in southern California. 174:4, 136-138. 1991.
• Karlik, J. (1991). Research results: Water use by groundcovers. Visalia, CA.
• Pittenger, D. R., Gibeault, V. A., and Cockerham, S. T. (1991). The California environmental horticulture industry. 41:1-4, 1-20. 1991.
• Pittenger, D. R. and Henry, M. (1991). Weighing landscape costs, benefits. 16:5, 18-23. 1991.
• Pittenger, D. R.; Gibeault, V. A., et al.; Hartin, J. S.; Shaw, D. A.; Cress, F. (1990). Dealing with a drought for California Landscapes. 1990.
• Pittenger, D. R., Hodel, D. R., Shaw, D. A., and Meyer, J. L. (1990). Determination of minimum irrigation requirements of six non-turf groundcovers in the landscape. 6 pp. 1990.
• Pittenger, D. R. and Stamen, T. (1990). "Effectiveness of Methods SUed to Reduce Harmful Effects of Compacted Soil Around Landscape Trees." 16: 55-57.
• UC (1990). How to buy a Christmas Tree. 3. 1990.
• Pittenger, D. R. (1990). Marigolds for the garden. 81:1, 9. 1990.
• Pittenger, D. R.; Hodel, D. R., et al.; Shaw, D. A. (1990). Relative water requirements of six groundcover species. HortScience. 25:9, 1085. 1990.
• Pittenger, D. R.; Cress, F. (1990). Results from a survey of California print mass media garden news editors and reporters. 25 pp. 1990.
• Lanini, T.; Graves, W., et al.; Munoz, F.; Pittenger, D. R. (1990). The use of legume living mulches for managing pests in vegetable production systems. U.C. Sustainable Agr. Res. and Edu. program, U.C. Davis. 37-38 pp. July 1990.
• Lanini, W. T.; Pittenger, D. R., et al.; Graves, W.; Munoz, F. (1990). The use of subclover mulches for weed control in vegetable production. Sacramento, CA.
• Pittenger, D. R. (1990). Water conservation in traditional landscapes. San Diego, CA.
• Pittenger, D. R. et al. (1989). Cooperative Extension Specialist Appointment and Promotion Procedures. 34 pp. April 1988.
• Pittenger, D. R., Grieshop, J. J., Smith, M. F. (1989). Evaluability assessment of the master Gardener program of California Cooperative Extension. Kluwer Acad. Publ.: 203-208.
• Bennett, H. (1989). Factors which influence irrigation scheduling. Anaheim, CA.
• Pittenger, D. R. et al. (1989). Review of the 1988-1989 Merit and Promotion process for Cooperative extension Specialist. 10 pp. August 24, 1989.
• Lanini, W. T., Pittenger, D. R., Graves, W. L., Munoz, F., and Agamalian, H. S. (1989). "Subclovers as Living Mulches for Managing Weeds in Vegetables." 43(6): 25-27.
• Pittenger, D. R. and Lazaeno, V. (1989). "Tailoring Cooperative Extension Programs to Serve Home Gardeners." 43(5): 28-29.
• Pittenger, D. R. (1989). The Master Gardener program in California. 2 pp. 1989.
• Lanini, W. T.; Pittenger, D. R., et al.; Graves, W. L.; Munoz, F. (1989). The use of subclover mulches in vegetable production systems. 42, 41. 1989.
• Pittenger, D. R., Kabashima, J., and Shaw, D. A. (1989). Trial results of phytotoxicity in groundcovers with Poast. 8 pp. 1989.
• Newman, J.; Cockerham, S., et al.; Downer, J. (1988). Amending the soil: when and how. Anaheim, CA.
• Hartin, J. S. and Pittenger, D. R. (1988). Sugessted landscape trees for the San Bernadino Valley. San Bernadino Co. Printing and Reprographics Department.
• UC (1988). Vegetable varieties for home gardeners. 12. 1988.
• Pittenger, D. R.; Lazaneo, V. F., et al.; Stamen, T. W. (1987). Analysis of the interests and needs of the urban horticulture audience. HortScience. 22, 1152. 1987.
• Pittenger, D. R., garrison, N., and Ririe, D. (1987). Evaluation of tomato varieties for home and urban gardners in California. 3 pp. 1982-1986.
• Pittenger, D. R. (1987). gardener's checklist for the west. 66:11, 9. 1987.
• UC (1987). Tomato varietites recommended for home and urban gardeners. 1. 1987.
• Pittenger, D. R. (1987). U.C.-tested tomato varieties recommened for southland gardeners. 78:3, 77. 1987.
• Pittenger, D. R. and Holt, D. (1986). Evaluation of fresh market tomatoes for urban gardeners. 8 pp. 1986.
• Pittenger, D. R. and Holt, D. (1986). Evaluation of fresh tomatoes. 77:2, 52-54. 1986.
• Pittenger, D. R. (1986). "Potting Soil Label Information is Inadequate." 40: 6-8.
• Pittenger, D. R. and Holt, D. (1985). "Evaluation of fresh market tomatoes for urban gardeners.": 8 pp.
• Pittenger, D. R. (1985). The relationship between packaged potting mix ingredients and quality. HortScience. 20, 546. 1985.
• Pittenger, D. R. (1984-1997). Home Horticulture Radio Features. UC DANR. 1984-1997.
• Pittenger, D. R. (1984). Master Gardener Compendium of Instructional materials. 103. 1984.
• Pittenger, D. R. and Holt, D. (1984). Urband horticulture resarch project reports. 11 pp. 1983-1984.
• Johnson, H.; Pittenger, D. R., et al.; Jr. (1983-1988). Vegetable Briefs. 1983-1988.
• Pittenger, D. R. (1983). Beneficial insects in home gardens. UC Davis. 1983.
• Pittenger, D. R. (1983). Care of cottonwoods. 1. March 1983.
• Pittenger, D. R. (1983). Controlling pests with chemical sprays. 1. January 1984.
• Hickman, G. W.; Pittenger, D. R. (1983). Diseases and pests of turfgrass--identification and control. University of California, Davis. 1983.
• Grieshop, J.; Pittenger, D. R. (1983). Master Gardener Sprouting Kit. 54. 1983.
• Pittenger, D. R. (1983). Oak root fungus. 1. October 1983.
• Pittenger, D. R.; Garrison, N. (1983). Pests and problems in vegetable gardens. University of California, Davis. 1983.
• Pittenger, D. R. (1983). Proper Pruning. 1. February 1983.
• Pittenger, D. R. (1983). Stress on urban trees. 1. May-June 1983.
• Pittenger, D. R. (1983). Trees' responses to autumn. 1. September 1983.
• Pittenger, D. R. (1983). Twig dieback of oaks. 1. April 1983.
• Pittenger, D. R. and Holt, D. (1983). Urban horticulture research project reports. 17. 1982-1983.
• Pittenger, D. R. (1982-1991). Urban Horticulture Help Notes. 1982-1991.
• UC (1982). A framework. 30. 1982.
• UC (1982). Home vegetable gardening. 37. 1982.
• Pittenger, D. R.; Gibeault, V. A., et al.; Davis, W. B. (1981). Home lawn care. University of California, Davis. 1981.
• Ohio State (1980). Care of foliage and flowering plants for retail outlets. 20. 1980.
• Poole, H. A. and Pittenger, D. R. (1980). Care of foliage and flowering plants for retail outlets. Produce Marketing Assoc., Inc. 115-149. 1980.

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