Timely Trees: Denver’s Fall Foliage

With the stunning fall foliage brightening up our landscape, let’s delve deeper into the trees that form these delightful colors. Instead of one ‘Tree of the Month’, we thought ashes, aspens, and maples deserve a massive shoutout for decorating Colorado in autumn brightness.

Despite it still feeling like summer during the days, the colder nights are bringing about that beautiful change in color to these trees.

Did you know? Leaves are green because of their chlorophyll production. Once the nights get colder, the trees stop producing as much chlorophyll as they begin to go into dormancy. 

Another fun fact about the leaves changing colors is that depending on the altitude, they’ll change color at different times during the season. 

For instance, if you’ve already made a trip through the Rockies, you’ve seen that many aspens have already turned that vibrant yellow. Meanwhile, the ash trees in the Metro Area are just now turning red and orange, and some maples are still green in some areas!

Good health is essential for keeping any tree looking bright and brilliant; otherwise, the leaves will simply turn brown and fall off, often prematurely. So here are some ways to care for your trees:

Ash Trees

Proper watering and overall maintenance are essential to keeping your ash tree healthy. But the biggest concern here for ashes is the Emerald Ash Borer. Now spotted as south as Littleton and Lakewood, keeping an eye on your ash is vital. You can spot the symptoms here.

We offer a seasonal spray or injection to manage these borers, and keeping your trees stress-free will also help you avoid these pests. 

Aspen Trees

Did you know? Aspens shouldn’t even really be planted below 6,000 feet in elevation. Since Denver is slightly below that, it takes a bit of upkeep to maintain their health. We recommend regular fertilization to provide them with the nutrients they need.

We also highly recommend raking these leaves in particular, since aspen leaves are more prone to fungal disorders that can harm the tree. By leaving them unraked, the fungus can rise into the open bud pores of the branches and damage the tree even further.

Maple Trees

There are many different species of maples, some of which are even on Denver’s list of Prohibited Street Trees due to their brittle branches and tendency to hollow out. However, many types of maples thrive in the Denver climate.

However, these maple trees are susceptible to aphids. But don’t worry, we have a spray for that. Maples are also vulnerable to chlorosis- a lack of nutrients caused by soil compaction. This is where our iron treatments come in handy.

We also recommend wrapping young maples in the winter to prevent sun-scalding.

Trimming & Pruning

ash trees in denver turning red

Our certified arborists recommend trimming any tree every 3-5 years. Trimming and pruning are done for more than just aesthetic purposes. Regular trimming can help regulate growth and prevent storm damage by removing brittle limbs that would otherwise collapse under the weight of snow or hail.

While our professional tree crews can trim or prune trees throughout the year (weather permitting), it can be better for some trees to be pruned at certain times of the year.

For instance, maple trees shouldn’t be trimmed right before winter. If it’s done during that time, excessive amounts of sap will build up and rain down on cars and sidewalks come spring.

However, some trees should wait for trimming to be done in the winter. This is usually reserved for some species of fruit trees, as they’re pretty prone to fireblight- and won’t catch this disease while they’re dormant.

Regardless of what kind of tree is in your yard, ArborScape is here to help! Our certified arborists provide free estimates and can write up a treatment plan tailored to your tree’s needs.

Give us a call today at (303) 806-8733 or visit our website to fill out a contact form, and we’ll address your tree care needs.



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