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Contact Us

University of California Cooperative Extension Ventura County
669 County Square Drive, Suite 100
Ventura, CA 93003
Phone: 805.645.1451
Fax: 805.645.1474

Office Directory

Office Hours:
Monday - Friday from 9 a.m. to 4 p.m. 

The office will be closed for the following holidays:

May 27 – Memorial Day
June 19 – Juneteenth
July 4 - Independence Day

Room Reservation Requests


Lawn vs Tree

Lawn grasses are very competitive with trees and shrubs, especially young stock, for nutrients and water. Grass roots will slow down and restrict the growth of tree and shrub roots that are planted in a lawn. Some grasses produce substances that are antagonistic (alleopathic compounds) to other plants that are planted in the grasses’ sphere of influence. Older, established trees and shrubs can survive and grow, although at a reduced rate, in a lawn environment as they are able to withstand the competition of the lawn grasses.
When planting trees and shrubs in a lawn area, a grass-free zone should be maintained for about one foot outside the original rootball for at least a year while the new plant becomes established in its new surroundings. If you want your tree or shrub to thrive, the grass-free zone should be maintained out to the drip line of the plant as it grows.