Everybody loves the changing leaf colors that fall brings, with leaves changing from green to shades of red, orange and yellow, before falling off the trees during winter. However, if you see leaves that have began to change color or yellow during the summer months, this is a sure sign of a health problem with your tree.
Leaves on your tree should never change color during the summer. If you have noticed a change in your tree's leaf color during summer months, below are a few reasons this could be happening.
Tree or Root Trauma
If you tree has just undergone some sort of trauma, this can often lead to leaf yellowing. Some instances of this may be if a tree has been improperly trimmed, or too many branches have been removed during a trimming, this can often send the tree into shock, causing leaf yellowing.
Another cause of trauma can occur at the root level. Often times, excavation projects can damage root systems of large trees, leading to shock and a change in leaf color to indicate the tree has undergone trauma.
Often times the traumatic events do not kill the tree, but the yellowing leaves are a sign that the tree is under some kind of stress and it could heal itself over time.
Under-watering your tree
Most people don't realize that even large mature trees do require watering. Often times people think the water their yard gets from their sprinklers will suffice for their trees as well, but the truth is that your grass soaks up most of this water before it even has then chance to reach the root system of your tree. Large mature trees on average require up to 5 gallons of water a week. A good way to make sure your trees are being properly watered, especially during the long summer droughts we experience here in Arlington and North Texas, is using a 5 gallon bucket to water all around your tree's base once a week.
If your tree is not getting enough water, it will often show this stress by a yellowing of it's leaves. Make sure you check the soil around your tree and try to drive a steak through the ground. If the ground is hard and you can't get the steak through it easily, then that's a good sign your tree isn't getting enough water.
Over-watering your tree
Like any other plant, your trees can also become over-watered. If your tree has become over-watered during a period of flooding or this can usually happen in a yard with poor drainage, where water and rain run-off may collect around an area near your tree, your tree will usually tell you it's being over-watered by changing leaf color.
Any time your trees begin to change their leaf color or lose leaves during the summer, this is a problem and it should be looked at immediately for the health of the tree.