slippery elm

Slippery elm (Ulmus rubra) should be watered regularly and deeply during the active growing season (spring to early fall). Water the plant once a week, providing enough water to moisten the soil to a depth of 6 to 8 inches. Do not allow the soil to dry out. During prolonged drought periods, water more frequently to keep the soil evenly moist. During the winter and fall, water less often, as the plant will be dormant and does not require as much water.

Slippery Elm thrives in full sun, and it can tolerate partial sun or shade. In general, Slippery Elm does best with at least 6 to 8 hours of direct sunlight each day. During the summer months in the Northern Hemisphere, Slippery Elms should receive approximately 12 hours of sunlight, or more if possible. In particularly hot climates, however, it is best to provide some afternoon shade to avoid leaf burn on the trees. In the winter months, the amount of sunlight for Slippery Elms can be reduced to as little as 4 or 5 hours of direct sun per day.

Slippery elm is an excellent shade tree, and it is relatively low-maintenance. Pruning should be done to encourage a strong structure and create a more attractive shape. Pruning is best done during late winter or early spring, before the tree has put out new leaves. Any pruning that occurs after leaves have grown could stress the tree and put it at risk for disease. Remove any dead, hanging, or weak branches to promote a healthier and more attractive tree. Additionally, cut back any branches that are crossing, rubbing, or growing out of shape. It is best to aim for removing no more than 1-fourth of the tree’s total foliage with each pruning session. If selective pruning is not done, it can cause excessive stress to the tree and limit its ability to photosynthesize.