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?

Squirrels: Topic for Webinar on May 19

California ground squirrel

If you are battling with ground squirrels or tree squirrels around your home or property, join us on Thursday, May 19 at noon for UC IPM's one-hour seminar on Squirrels! Dr. Niamh Quinn, UC ANR's Human-Wildlife Interaction Advisor in Orange, Los Angeles,...

Drought Resources for Keeping Trees Alive

keep trees alive during drought

University of California Cooperative Extension Drought Resources To Keep Your Plants Alive "Trees Come First Under Drought and Water Restrictions" Keeping Plants Alive Under Drought and Water Restrictions (English)...

Woodpeckers fact sheet updated

Pecking damage by woodpeckers. [Credit: James Jay Farrar]

Woodpeckers are well known, colorful birds often found in wooded neighborhoods and forested areas. While they are wild creatures many people appreciate, they can become a pest problem when they damage buildings in search of food and nest building...

CANCELED: Webinar This Thursday 4/21: Invasive pests!

Spotted lanternfly is an invasive insect not yet found in California. [Credit: Lawrence Barringer, Pennsylvania Department of Agriculture,]

Due to unforeseen circumstances, the webinar scheduled for April 21 has been canceled and will be rescheduled for another date. We apologize for the inconvenience. --- What are you doing the third Thursday of each month at noon? Joining UC IPM for our...

Easter egg hunt 2022-- ANSWERS

D. Indian walking stick egg.

Below are the answers to our 2022 virtual Easter Egg hunt! How did you do? Brown widow spiders, a relative of black widow spiders, have egg sacs which are cream colored and spikey, compared to western black widow egg cases which are smooth. Find out...

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