Ash Tree Care

Ash Tree Care

Ash Trees

Ash tree care vary widely. An autumn purple ash is 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 prone to stress. Borer diseases are the main vector but ash have some common problems  in the Denver metro area. 

read about ash tree care on ArborScape Denver Tree Service blog

Denver Ash Tree Care

With the continuing spread of the invasive Emerald Ash borer (EAB),  emerald ash borer (EAB) prevention is required if you want an ash tree in Colorado to survive. There are two treatments you will want to know about to protect your tree. These have to be done BEFORE a tree is hit! The first step is to decide which ash trees you want to save-most can’t afford to treat every tree especially if you a have a lot of ash. Then you need to keep track of ash borer sightings in your neighborhood to gauge the timing. We recommend sooner than later though because EAB can be an area without official detection.  To learn more about EAB, the most famous beetle in Denver since mountain pine, check out our blog posts here, here and for EAB symptoms here

If your ash tree seems robust, doesn’t have evidence of borer activity, but has some browning of leaves: try a deep root wateringTreating for drought can bring the tree back to life. 
A quick note that there are three distinct ash borers or beetles common to Colorado ash trees.  A preventative spray is available from our ash tree care facility and is recommended in late April and May when the lilac/ash borer is flying, and will protect the tree from ash borer.  Also it’ s important to plan to replace ash trees near the end of their life or when invasive species threaten them.
Ash Tree Trimming

Ash trees become un-sightly very quickly without consistent pruning. This due to their complex and quickly-growing branch structure habit.  Trimming an ash tree is important to reduce competing branches, and help promote healthy branch development. These will quickly become overgrown!

Compared to other types of trees, ash thinning is crucial to allow the tree to process energy.  Ashes frequently get nailed as far as snow collection and branch damage, so removing branch area makes it less prone to breakage from collected snow weight.

Ash tree trimming can be quite extensive at the time time of service and there is 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

Ash trees will become the most common hazard tree removal in Colorado soon. This means it becomes more dangerous to remove increasing the cost substantially. Decide now to remove and replant or take a risk of sticker shock down the road. 

Why are ash trees becoming the most common hazard tree, a dubious honor belonging to cottonwoods for the last decade? 

The discovery of EAB and the continuing spread of lilac ash borer. 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, causing the cost of a ash tree removal to increase up to three times. 

One question that we often get 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. 

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