Ash Tree Care 2017-06-06T14:26:13+00:00

Ash Tree Care

read about ash tree care on ArborScape Denver Tree Service blog

Ash Trees

Ash treatments vary widely. An autumn purple ash is bit more vulnerable to ash borer.  Due to poor soil quality in Colorado, we recommend a deep root fertilization in spring and fall/early winter for all varieties of ash trees that are stressed or are prone to stress. Following are some common problems we see with ash trees in the Denver metro area.

Is my tree an ash? Identify an Ash tree in two steps (video)

Denver Ash Tree Care

The health of your ash tree is hampered when it is stressed from dryness or is lacking nutrients. This makes it a prime target for the lilac ash borer.

With continuing spread out of Boulder county, Emerald ash borer (EAB) prevention is required if you want an ash tree in Colorado to survive.

A preventative spray is available from our ash tree care facility and is recommended in late April and May when the insect is flying, and will protect the tree from ash borer.  Look for small, circular holes in the trunk and curling or brown leaves.
If your ash tree seems robust, doesn’t evince borer activity, but has some browning of leaves: try a deep root watering.

Ash Tree Trimming

Ash trees get overgrown quickly due to their habit of growth. Trimming an ash tree is important to reduce competing branches, and help promote healthy branch development.  Compared to other types of trees, ash thinning is crucial to allow the tree to process energy.  Ashes frequently get nailed pretty badly as far as snow collection, so removing branch area makes it less prone to breakage from collected snow weight.

Ash tree trimming can be quite extensive and there is some potential to lose some shade in the short term.  We disclose this upfront, because it’s usually the ash tree trim that can cause our customers to  panic about how much has been trimmed out. However, over the course of the growing season, you’ll find that the tree grows rapidly into its new look. Ash trees branch out again quickly, so the newly pruned ash will really beautify and provide shade cover for years to come.

Trim an ash correctly the first time, and it will hold its value and curb appeal, and avoid breakage in the winter.

Ash Tree Removal

Since the discovery of EAB in Colorado in 2013, it’s become a major factor in considering what ash trees you might remove. Dying, old, and poorly placed ash trees should be designated for removal before EAB hits them. The ash tree becomes more unstable once ash borer is in the tree, making the cost of ash tree removal increase up to three times. Low profile ash trees should be removed sooner, rather than later.

One question that occurs is whether removing an ash tree will help control the spread of EAB to other nearby ashes. While there is no absolute, in the urban forest of Denver, it’s not likely to prevent the spread of EAB to other trees. However, there are now injections available for ash trees.

Try our fast, free Emerald Ash Borer cost calculator to get an idea of projected costs to treat or remove your ash trees in the coming years.

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