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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?

Can I Use Vinegar to Control Weeds?

The potential health hazards of concentrated vinegar. Photo from the National Pesticide Information Center (NPIC).

Acetic acid, also known as vinegar, is used in products for weed control. Many people choose it because it is natural. However, acetic acid can damage skin and eyes, especially at concentrations commonly found in weed killers. What is the difference...

What are exotic and invasive pests?

Glassy-winged sharpshooter adult. Photo by Jack Kelly Clark, UC IPM.

Exotic and invasive pests threaten California's natural environments, agricultural production, structures, landscapes and gardens. Exotic pests are organisms introduced into an area beyond their natural range and become pests in the new...

Urban Pesticides, Fertilizers, and Water Quality

Urban parkway next to a large canal. Photo by Larry L. Strand.

Pesticides and fertilizers applied around homes, residential or commercial landscapes, school sites, and other areas can enter our creeks, rivers, and oceans, degrading water quality. While pesticides and fertilizers can be useful in controlling pests...

Organic, Natural, and Less Toxic: What’s the Difference?

You've heard of terms such as green, organic, natural, ecofriendly, and less toxic to describe pest control products and services. But what do these terms really mean? To different people, they can mean different things, creating obvious confusion. But...

July Pest Prevention Tips

Follow these tips for the month of July to prevent pests in the garden and landscape. To see more tips specific to your region, visit the Seasonal Landscape IPM Checklist on the UC IPM website. Clean up fallen fruit or nuts to avoid...