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?

Quarantine Baking and Kitchen Pests

Indian meal moth adult in wheat flour. (Credit: Jack Kelly Clark)

As many people you know have turned to baking during quarantine, it is likely that ingredients such as flour will continue to be in high demand. While you may be tempted to stock up when you find these ingredients, you should also consider how to...

Watch Out For Invasive Shot Hole Borers on Your Landscape Trees

adult ishb (photo by G. Arakelian)

Watch out for these insects! Invasive shot hole borers (ISHB) represent two related species of beetles (polyphagous and Kuroshio) in the genus Euwallacea. Both spread fusarium dieback, a disease that restricts the flow of water and nutrients in the tree,...

Correct Use of Disinfectants

covid-infographic NPIC

Many people have increased their use of disinfectants and sanitizers due to the COVID-19 crisis. It is important to use these products correctly to ensure they are effective and to protect ones health. See the info graphic below from the...

Murder Hornets! Everyone Calm Down

Asian Giant Hornet <i>V. mandarina</i><br>(Credit: Washington State Department of Agriculture)

First things first: "murder" hornets, or more correctly, the Asian giant hornet, have NOT been found in California. The term murder hornet is also not quite accurate. It attacks honey bees, which isn't desirable of course, but the important thing to...

Anthracnose Pest Note Updated

Black leaf spots caused by Chinese elm anthracnose.<br>(Credit: Jack Kelly Clark)

Anthracnose is a group of fungal diseases that infect many trees and shrubs, causing dark lesions on leaves and cankers on twigs and stems. In some areas of California, vegetables and turfgrass can also be infected with anthracnose. Symptoms of...

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