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?

Maggots in your food waste bin?

A kitchen food waste bin. Photo by Lauren Fordyce, UC IPM.

Indoor food waste bins (also known as kitchen bins or compost bins) have become a popular addition to Californian homes. They are a great way to collect food scraps and divert food waste from landfills, but they can sometimes attract pest insects like...

Emerald Ash Borer Awareness Week 2024

Adult emerald ash borer on a US penny for size comparison. Photo by Howard Russell, Michigan State University,

The emerald ash borer (EAB) may be beautiful, but it is the most destructive forest pest ever seen in North America. Hundreds of millions of ash trees across 36 states and 5 Canadian provinces have been killed by this invasive insect. Fortunately, EAB...

What are “Good Bugs”?

Four syrphid flies around a poppy flower in a garden. Photo by Belinda Messenger-Sikes, UC IPM.

There are many types of “good bugs” commonly found in the garden or landscape. In integrated pest management (IPM) we refer to “good bugs” as “natural enemies” or “beneficial organisms”. Natural enemies can...

Updated Pesticide Active Ingredient Database from UC IPM

Information on the pesticide active ingredient neem oil. From the UC IPM Pesticide Active Ingredient Database.

The University of California Statewide IPM Program (UC IPM) has an exciting, newly updated resource to help you better understand pesticide active ingredients and the risks different active ingredients pose to people and the environment. The Pesticide...

Summer IPM Webinars

New IPM webinars announced!

Need some summer plans? Join UC IPM at 12:00pm on the third Thursday of every month to learn about pest identification, prevention, and management around the home, garden, and landscape! These free IPM webinars are open to the general public so...

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