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?

Abiotic Problems of Tomato

Horn/nose development on tomato fruit (Credit: N Volesky)

  Originally published in the Summer 2021 issue of Utah Pest News.  Many problems that gardeners experience with tomato plants are not related to insect pests or diseases. Rather, they are associated with adverse growing...

Poison Oak: Leaves of Three, Let Them Be

Poison oak showing 3 leaflets.<br>(Credit: J DiTomaso)

Poison oak is a common native plant in California, growing everywhere from oak woodlands to urban parks. Chances are, you or someone you know has suffered from a rash due to poison oak at some point. The best way to avoid exposure to poison oak is...

New WeedCUT online tool to manage invasive weeds in wildlands without herbicides


California has abundant wildlands — forests, rangeland, open areas, wildlife refuges and national, state, and local parks — that need protection from invasive plants. Invasive plants affect all Californians by increasing wildfire potential;...

Tips to Keep Your Landscape Plants Alive During Drought

trees shade and conserve energy

• Your trees come first! If there just isn't enough water to go around, your lawn and flowers should be sacrificed instead. Trees are our most valuable landscape resource and take years to maximize their benefits (shade, cooling, habitat/ecosystem...

Wild Turkeys: Is This a Pest?

Adult male wild turkeys (toms). (Credit: K Windbiel-Rojas)

Have you seen wild turkeys wandering through your neighborhood? These American birds were once on the verge of extinction but now can be found foraging for food in urban and suburban neighborhoods. Some people enjoy the sight of a flock of wild turkeys...

Webmaster Email: