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?

Oh Dallisgrass

Mature dallisgrass plant, Paspalum dilatatum. [Credit: K Windbiel-Rojas]

Knowing what weedy grass you have in your lawn or landscape is very important in being able to properly control it. Dallisgrass is a common perennial weed that is easily identified and grows in uneven clumps in lawns and turf. This growth pattern creates...

Bad Bunnies

A black-tailed jackrabbit, also known as a hare. [Credit: US Fish and Wildlife Service]

Many people think wild rabbits hopping around are adorable—there's even an international rabbit day celebrating wild and domestic rabbits—but they're less welcome when they're eating your carefully tended garden. Wild rabbits in California...

What are Abiotic Plant Disorders?

Sunburned bell pepper with a necrotic spot. [Credit: Jack Kelly Clark]

Abiotic plant disorders are generally caused by environmental conditions, rather than microorganisms. They are sometimes called noninfectious diseases. Abiotic disorders can develop if a plant's needs are not being met. Abiotic disorders can not only...

Invasive Pest Spotlight: Brown Marmorated Stink Bug

Features of brown marmorated stink bugs. [Credit: Steve Jacobs, PSU]

The invasive pest spotlight focuses on emerging or potential invasive pests in California. In this issue we are covering the brown marmorated stink bug (BMSB).    Brown marmorated stink bug facts    BMSB can cause severe...

Drought or Disease?

A drought-tolerant garden bed of California poppies, Ceanothus, and Watsonia. Photo by Tina Saravia, UC ANR.

With ongoing drought and local water restrictions in place in many areas of California, you may start to see landscape plants suffering from stress caused by a lack of water, calledwater stress. Water-stressed plants can have symptoms that resemble...

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