What is this?
This newly planted tree has been over-watered, whether by nature, humans or both. Overwatering can kill new trees.
How do I fix it?
Allow the tree pit to dry out for a week. If water is sitting in the tree pit, bail it out the best you can. Pull mulch away from the tree’s rootball to allow the soil to dry.
Can it be prevented in the future?
Newly planted trees need about 20 gallons of water per week. Dig down into the tree pit, outside of the tree’s rootball, about 6 inches using a hand trowel. If the soil is wet, do not water your tree. Wait until the soil in the tree pit is dry. You can also purchase a moisture meter to help determine the wetness of the soil.
Special Note:
Over-watered and under-watered trees can look surprisingly similar. Stick your hand in the soil if you are unsure. You can also use a moisture meter to monitor and test the soil.
See below for more images of over-watered trees:
