Green ash trees are deciduous trees that grow natively in North America. These trees often grow in home landscapes and in median strips along city streets. Green ash trees typically grow to approximately 60-feet tall and 45-feet wide. As green ash trees grow to maturity, they become an attractive oval shape. Gardeners must prune green ash trees when they are young to promote one strong center trunk and lateral branches growing evenly out from the center trunk.
Examine the green ash tree in the autumn prior to winter. If gardeners leave green ash trees to grow without pruning, they will grow more than one center trunk. This will result in a compromised tree that is not sturdy and strong. Spread the tarp under the tree to collect removed branches. Set up the stepladder to enable you to reach upper branches if necessary.
Use the lopper to remove any secondary leader trunks before they become large. Trim these leaders off even at the intersection with the main trunk.
Look at the lateral branches next. For best results, encourage evenly spaced lateral branches on both sides of the center trunk. If two branches grow out from either side of the center trunk at the same point, remove the less vigorous branch at the main intersection. This will promote a strong and healthy tree.
Examine the green ash tree again in the late winter to assess any winter damage that often occurs with wind and ice. Remove any broken or damaged branches prior to the growing season.
Pull away the tarp after pruning, and discard the branches.