Caring for Trees

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Parks & Trees Division

1636 Compromise Line Road, Glendora, CA 91741-3380
Office Hours: Monday - Friday 9am - 5pm | Saturday - Sunday CLOSED
Phone: (626) 852-4869

The average Californian uses 196 gallons of water per day, the summer water use increases. Depending on the region, homeowners use between 30 and 70 percent of their water outdoors and it is estimated that 50 percent of the water we use outdoors goes to waste from evaporation, wind, or runoff due to over-watering.

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Help Your Trees Survive the Drought

Trees are valuable assets! Trees make our houses feel like home-they also improve property values, clean our water and air, and even make our streets safer and quieter. When we water wisely and maintain our trees carefully, we enjoy a wide range of benefits at a low cost and with little effort.

Young trees have less established roots and need easier access to water to establish deep root systems. During the drought, water young trees twice per week. Mature trees require more water when growing near heat traps such as driveways and foundations, water the “drip zone” area directly beneath the foliage and shaded area by the tree. Trees that are exposed to hot afternoon sun and constant wind suffer greater water loss making it important to water early in the morning or after the sun has set to replace the water lost during the day and lead to less evaporation. Mulching your tree can also lower soil temperature. Click here to get more tips on caring for your trees during a drought.


Help Preserve Our Native Coast

By virtue of their majestic beauty and the many benefits they provide to both people and wildlife, they are deserving of protection. It is the goal of the City to preserve and promote the native species and to increase the native tree population.

Over time, the native Oaks have suffered the consequences of inappropriate watering and landscaping beneath their canopy. Particularly detrimental to the health of a well-established Oak is the application of water to the trunk and base of the tree during the summer months. Because the Coast Live Oak is native to Southern California, it has adapted to our dry summers. Irrigating underneath the canopy of these trees during the warm season provides an environment conducive to the spread of Oak Root Fungus. This pathogen spreads slowly throughout the root system, and then travels up the inside of the bark, girdling the tree and causing eventual death. Oak trees existing in dry soil are not susceptible to the fungus.

It is that time of year again and the City is asking all residents to avoid irrigating underneath the canopy of the mature Oaks during the warm season. If you have questions, please contact the Parks Division at (626) 852-4869