Center for Landscape & Urban Horticulture
University of California
Center for Landscape & Urban Horticulture


Oak Trees on Golf Course
Welcome to the Center for Landscape and Urban Horticulture (CLUH), an information resource of the University of California Cooperative Extension (UC Cooperative Extension). The CLUH supports UC Cooperative Extension educational and applied research programs serving California's environmental horticulture industry. This site features science-based information on:


Please review our Mission Statement.


Low Water Landscape
For the latest science-based information on landscape water needs, please visit our pages under Landscape Water Conservation and Irrigation Management.




Cactus Garden LA Arboretum
Information is contributed by University of California Cooperative Extension scientists. All content is reviewed by these or other experts to assure it is authoritative and science-based. Featured are summaries of technical topics, fact sheets, newsletters, reports, commentary, and web links.



Calif. water use pie chart 2015
THE 9%: Landscape irrigation accounts for just 9% of water use in California, yet landscapes are under relentless attack as California confronts ongoing drought.  The facts presented here show how these attacks are misguided and that there are ways to conserve water without degrading landscape plantings.


Does the landscape you manage have a water budget or water conservation goal that seems impossible to meet? Read about Five Simple Steps for Conserving Landscape Water.



For Home Gardening information and resources, please visit the University of California Garden Web 

Raised Bed Gardening


What's new in Landscape and Urban Hort?

April Pest Prevention Tips

Visit the UC IPM Seasonal Landscape IPM Checklist for a list of pest prevention activities for each month.

Spring is here and if you are like us, you can't wait to get outside and see how your plants and garden are doing! As usual, UC IPM has useful tips for the month of April to prevent pests in the garden and landscape. To see more tips specific to your...

Easter Egg Hunt Answers!

Leaffooted bug eggs. Photo by David R. Haviland, UCCE.

Below are answers to UC IPM's 2024 insect Easter egg hunt! Click on the name of each insect to learn more.  A. Brown marmorated stink bug These eggs belong to the brown marmorated stink bug (BMSB) a pest of many types of plants and occasional...

Invasive Pest Spotlight: West Nile Virus

West Nile virus is mainly spread by Culex mosquitoes. Photo by Matthew Bertone, North Carolina State University Extension.

The invasive pest spotlight focuses on emerging or potential invasive pests in California. In this issue we are covering West Nile virus. West Nile Virus Facts West Nile virus disease was first reported in California in 2003 and has become the most...

Need Help Identifying Weeds?

Figure 1. Broadleaf plant characteristics page from the UC IPM Weed Gallery.

After all the winter rains you may find yourself dealing with weeds and struggling to control them. The first step in successfully controlling weeds is knowing what weed you have. Well, you're in luck: the UC IPM website contains many useful resources to...

Wet Weather Tree Diseases

Figure 3. Shot hole symptoms on apricot leaf and young fruit. Photo by Jack Kelly Clark.

After years of drought, we welcome rain in California. But we also recognize that rain can help spread a number of plant diseases. Rain and wind can splash bacteria and fungi from infected leaves, branches, and blossoms to uninfected parts of the tree....

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