California Ash Tree Care And Maintenance Guide

The California ash tree is native to the southwestern part of Northern America. With a height of approximately 20 to 25 feet, it is the smallest of all species of ash trees. They have fluffy white blooms with a sweet smell. They are popular in landscape and lawns as they add shade and aesthetics. Best of all, they do not require a lot in terms of care and maintenance. 

From proper watering to tree trimming California, growing ash tree requires a proactive approach. Read on and we’ll talk about how you can ensure its health and survival. 

Tips and Tricks for California Ash Tree Care and Maintenance 

While growing an ash tree does not require too much on your end, it is important to exert effort in taking care of it. Below are some of the best things to do, which are also applicable in other species, such as the Modesto ash tree


According to providers of tree services California, watering should be done at least every after few days when the tree is young. This will help in establishing healthy roots. After the roots are established, you do not have to water frequently. Watering is needed only during drought. They are quite resistant to the heat, so no need to water often. Over-watering can cause problems. 


When the California ash tree is young, there is no need for fertilizing. It is enough to make sure that there is high-quality and well-draining soil for the tree to establish. Nonetheless, at least once a year, it is a good idea to apply an organic and well-balanced fertilizer. Putting wood mulch around the base of the tree will help retain the necessary moisture. When choosing a fertilizer, see to it that it contains essential macronutrients to sustain its nutrition needs.


California ash trees require little pruning, making its maintenance a lot easy. Despite this, you need to get rid of damaged branches. The failure to do so will result in the spread of diseases. Not to mention, it also weakens the structural integrity of the tree, and without the proper intervention, can be a safety hazard. 

In some instances, pruning won’t be enough. Tree removal California is necessary when the damage is severe, and the tree can no longer be spared from significant damage. The tree can turn too brittle as a result of pest infestation, leaving you with no other option but to have it removed. Work with the pros who have the tools and expertise! 

California Ash Tree Pests and Diseases 

For a comprehensive understanding of ash tree care and maintenance, you should know the pests and diseases that can cause harm. Early identification of these problems is necessary to execute an effective solution. 

Related Post: Oak Tree Diseases California


A common problem during cool and wet spring, the ash anthracnose disease is caused by Plagiostoma fraxini, which overwinters in the petioles and twigs. The most common signs include the presence of water-soaked spots on the leaves. Cultural controls include pruning and raking diseased leaves. Foliar chemical sprays are also helpful. While fungicides can help, take note that they are only best when used as a preventive measure. 

Verticillium Wilt 

It is a fungal disease that thrives in the soil. Curling, wilting, and discoloration of leaves are some of the most common symptoms of this disease. It invades the ash tree through its roots and will eventually spread to the vascular system. Aside from discoloration, it also causes the bark to peel. Once it has entered the host, there is no cure. To prevent the disease, execute the best ash tree care and maintenance to make it healthier. 

Ash Flower Gall

Galls are caused by tiny eriophyid mites that cause male ash flowers to turn round and green. It results in the formation of about half an inch tumor-like damage. While this disease does not kill the tree, it is a cause of concern because it is unsightly. It is difficult to control, but effective interventions include the application of carbaryl when the first blooms appear in spring. 

Emerald Ash Borer 

When it comes to pests affecting the California ash tree, the emerald ash borer is one of the most popular. While it is native to Asia, it has already reached many parts of the United States. It has destroyed millions of ash trees. If the tree is young, it can die within a year after the infestation. Some of the most common symptoms include yellow foliage and shoots appearing from the roots. Limit movement of firewood and burn supply with the pest before spring to control the population of emerald ash borer.  


Q: How do I identify an ash tree? 

A: One of the best ways to identify an ash tree is through its branches. It has a pair of branches that grow on opposing sides. It has one leaf in a bud with up to 11 leaflets. Once the tree matures, the bark grows tight and develops a diamond pattern. 

Q: Are ash trees worth money? 

A: Yes, ash trees are worth money. While it is far from being the most expensive wood, in recent years, its value has significantly increased. Make sure that the lumber is in good condition to ramp up its price. 

Q: How fast do ash trees grow?   

A: The ash tree is known for growing moderately fast. Depending on the species, it can grow anywhere from 18 to 25 feet within ten years. 

Q: What does the bark of an ash tree look like? 

A: The bark of an ash tree is smooth when it is young. As the ash tree grows older, however, it develops a highly visible diamond pattern. 

Local Tree Experts Overview 

Taking care of the California ash tree is quite straightforward. From regular watering during its establishment to pruning diseased branches, take note of the things mentioned above to ensure its survival! Learn how to identify pests and diseases to execute the necessary interventions as early as possible. 

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