Arbor Day 2019

by City Council Member Christy Weir

I grew up in a house between two huge walnut trees. Those old trees fed, shaded and entertained us. Many evenings were spent cracking walnuts, our fingers turning black. Summer days we enjoyed climbing, creating rope swings and building forts in our tall, sturdy trees. Fortunately, the developer who built our neighborhood preserved some of the existing walnut orchard when he built the homes. I have vivid memories of the thick, rough trunks, the strong branches, the perfect perches and the smell of roasting walnuts.

As Arbor Day (April 26) approaches, we are reminded of the crucial role trees play in our city and in our world—they are nature’s remarkable gift to us.

Here are 12 ways that trees keep our environment beautiful and healthy:

Trees combat the greenhouse effect

Burning fossil fuels and destroying tropical rainforests have created excess greenhouse gases. Heat from the sun, reflected back from the earth, is trapped in this thickening layer of gases, causing global temperatures to rise. Carbon dioxide (CO2) is a major greenhouse gas. Trees absorb CO2 and release oxygen back into the air. In one year, an acre of mature trees absorbs the amount of CO2 produced when you drive your car 26,000 miles and can provide enough oxygen for 18 people.

Trees clean the air

Trees absorb odors and air pollution and filter particulates out of the air by trapping them on their leaves and bark.

Trees cool streets and cities

Average temperatures in Los Angeles have risen 6°F in the last 50 years as tree coverage has declined and the number of heat-absorbing roads and buildings has increased.

Trees can cool cities by up to 10°F, by shading homes and streets, breaking up urban “heat islands” and releasing water vapor into the air through their leaves.

Trees save water

Shade from trees slows water evaporation from thirsty yards. Most newly planted trees need only fifteen gallons of water a week.

Trees help prevent water pollution

Trees reduce runoff by breaking rainfall, allowing water to flow down the trunk into the earth below the tree, and absorbing water through leaves. This prevents stormwater from carrying pollutants to the ocean and replenishes underground aquifers.

Trees help prevent soil erosion

On hillsides or stream slopes, trees slow runoff and hold soil in place.

Trees shield children from ultra-violet rays

Skin cancer is the most common form of cancer in the United States. Trees reduce UV-B exposure by about 50 percent, thus providing protection to children on school campuses and playgrounds – where children spend hours outdoors.

Trees provide food

Fruit trees can yield up to 15-20 bushels of fruit per year and can be planted on most urban lots. Aside from fruit for humans, trees provide food for birds and wildlife.

Trees heal

Studies have shown that patients with views of trees out their windows heal faster and with less complications. Children with ADHD show fewer symptoms when they have access to nature.

Trees provide screening

Trees can mask concrete walls or parking lots, and unsightly views. They muffle sound from nearby streets and freeways. Trees absorb dust, block wind and reduce glare.

Trees increase property values

The beauty of a well-planted property and its surrounding street and neighborhood can raise property values by as much as 15 percent.

Trees increase business traffic

Studies show that the more trees and landscaping a business district has, the more business will flow in. A tree-lined street will slow traffic, so drivers have time to look at the storefronts.

The City of Ventura has been designated a Tree City USA, and we continually strive to improve the health of our urban forest—35,000 city trees in parks and along public streets. Last year, we planted 106 new street trees, and trimmed 7630 trees. You may have noticed one of our most recent additions, slow-release watering bags on newly-planted street trees. This gives thirsty young trees the water they need and saves time for our busy urban forestry staff. We are using recycled water, trucked from the city’s wastewater treatment plant. We are also requiring that the landscaping in parking lots include plenty of canopy trees, for purposes of shade, aesthetics and water and air quality.

The City will be observing Arbor Day this year by planting six trees in Arroyo Verde Park, to replace trees destroyed in the Thomas Fire. You can help us celebrate Arbor Day by planting a tree in your yard. Recommended species for Ventura are listed on our website,, under Urban Forestry.

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