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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.

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

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.

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.

UPCOMING EVENTS

What's new in Landscape and Urban Hort?

Spring Cleaning for Pest Prevention

A clothes moth larva with its feeding case attached. (Credit: DH Choe)

Spring has arrived and with many Californians at home due to local coronavirus directives, now could be an opportune time for some spring cleaning. This annual ritual also has the benefit of preventing and reducing indoor pests. Cleaning and...

Disinfectants are pesticides–so use safely!

Antimicrobials include several categories of products. To maintain virus-free surfaces use a disinfectant or a virucide. Sterilants are generally more toxic and reserved for critical environments like hospitals. Infographic courtesy Enviroxyclean.

What do “pest control” and public health campaigns against SARS Cov-2 have in common? Both activities use pesticides. In the eyes of the law, sanitizer and disinfectant products are considered pesticides. And if you're a...

Using hydrogels to develop a yellowjacket bait

Figure 1. Western yellowjacket baiting with the hydrogel bait. After a short handling behavior on the bait, yellowjackets flew away with a small piece of the hydrogel bait. (Credit: DH Choe)

Many parks, recreational areas, and outdoor venues in California are home to yellowjacket wasps (Vespula spp.). Yellowjackets are commonly attracted to human food items, creating a serious nuisance and a potential stinging threat. If found, nests...

Online training courses and webinars available from UC Statewide Integrated Pest Management Program

This spring if you are looking for options to obtain your continuing education units (CEUs) and not sure where to get them, why not check out the online options that the UC Statewide IPM Program (UC IPM) has to offer. For license and certificate holders...

"Virus Shut Out" is Illegal Product in U.S.

U.S. EPA Acts to Protect the Public from Unregistered “Virus Shut Out” Product Imported into Honolulu and Guam Unsubstantiated claims to protect against viruses threaten public health HONOLULU – Today, the U.S....