This list highlights some common issues affecting trees in the Colorado Springs area. For more detailed help, please consider contacting a certified arborist to assist in tree health care.
Read the label before applying any herbicide. We have been seeing an increase in sudden tree death (2019) due to improper applications. Many readily available weed control products contain imazapyr or imazapic, which can be harmful or even fatal to trees. Be wary of products marketed for “season-long control” or “extended control” of weeds.
If using a product known to be harmful to trees, avoid applying it within the dripline (area beneath the crown of the tree), and consider that tree roots are concentrated in the upper 12-18” of soil and may extend in a radius 2-3 times the size of the above ground crown.
Xeriscaping done improperly or without consideration for an existing tree
Consider how you will need to maintain a newly xeriscaped area. Will you need to apply herbicide to prevent weeds? Will you stop watering? To protect trees during a xeriscape conversion, consider applying an area of wood mulch to retain moisture and moderate temperature. While rock mulch may seem to be an attractive and more permanent solution, it can increase soil temperature, which is detrimental to the tree roots, and makes cleaning up fallen leaves more challenging.
Lawn mower or string trimmer damage
Consider adding a layer of wood mulch underneath the tree’s canopy (2-4” deep and not directly against the trunk) to eliminate the need to cut grass immediately next to the trunk. Be mindful of shallow roots and avoid running a lawnmower over them on a low height setting.
Cutting roots for driveway expansion, sidewalk repair, xeriscape conversion, or other construction could significantly affect the health and stability of a tree. Consult an arborist when planning projects.
Construction vehicles or even just parking a personal vehicle close to a tree can compact the soil and make it difficult for the tree to absorb sufficient water, nutrients, and oxygen. Consult an arborist or designate a tree protection zone close to the tree. The majority of compaction occurs in the first few passes and is extremely difficult to reverse.
Storm damage or structural failures
Though storm damage is not always preventable, you can improve tree outcomes by consulting with an arborist about the need for structural pruning. Training young trees during the first 10 years after planting can have the greatest effect on long-term tree structure. Minor pruning of young trees improves long-term structure and strength, while maintenance pruning of mature trees can significantly improve tree resiliency by identifying weak areas and proactively reducing potential hazards.
All trees should get supplemental watering for at least the first 3 years after planting. Be aware that a tree’s water needs will vary by species. Selecting drought tolerant trees will save money on watering over the lifetime of the tree. All trees benefit from additional water throughout their lifetimes, especially in periods of excessive heat and drought, and even more so if their water needs are high. Remember that we live in a high, arid desert and our average rainfall amounts are much lower than what some of these non-native trees require. Add mulch (2-4” thick but not directly against the trunk) to help retain moisture and protect the roots from excessive temperature changes. Consider winter watering if it has been a very dry winter. Water on warm days when the water can penetrate into the soil.
Cutting a limb too close to the trunk (flush cut) removes critical tissues that can help the wound callous over to protect the tree from disease and decay. Likewise, cutting a limb and leaving a stub also slows the tree’s response and can lead to increased decay. Learn about proper pruning techniques courtesy of Ed Gilman at the University of Florida, but also consider calling a certified arborist to assist you.
Read more on the Colorado State Forest Service website. Click on Trees and explore the publications under Tree Selection, Planting & Care.