Prune apple trees, including flowering crabapples, mountain ash, hawthorns and shrub cotoneasters in late winter (February-early April). Spring or summer pruning increases the chances for infection and spread of the bacterial disease fireblight.
Autumn or early winter pruning is more likely to result in drying and die-back at pruning sites. Apr 05, When to prune ash trees depends in part on why you are making the particular pruning cut. Unless you are pruning to remove dead and diseased branches, you should take care to prune in late winter, while the tree is still dormant. Most trees perform best when trimmed in the spring, according to University of Illinois Extension. Some trees, including oak, ash and elm, thrive with late summer or fall trimming.
Ash trees should be trimmed in the fall. Avoid trimming ash trees in the summer, when stressed ash trees prove most susceptible to the ash borer. Recommended trees for each region perform reliably in that environment and should thrive for many years. Recommendations include trees to replace ash trees harmed by emerald ash borer.
For a short list of selected winter-hardy, disease resistant trees and shrubs for home yards and gardens, see Select trees and shrubs for Minnesota landscapes.
Identify Ash Trees. Keys to identify ash trees. 1. Has branches that grow directly across from one another Minnesota's ash trees. Black ash tree. Black ash trunk. Black ash leaves. Black ash seeds. Black ash (Fraxinus nigra) Form. grows best in rich soil; intermediate in shade tolerance. Questions?
Call or MINNDNR ( Sep 29, Starting October 1st, it is safe to begin cutting and pruning ash trees in Minnesota. Due to Emerald Ash Borer (EAB), a non-native insect transported from Asia to the US that kills ash trees, we generally do not work on ash trees from May 1 – September 30 when the insect is most active and likely to spread to other trees.
CUTTING ASH TREES IN MINNESOTA. Nov 20, If your tree has a less severe problem, one of the best times to remove trees is during the dormant season, between late winter and early spring. Here’s why. Dormant trees are leafless and lighter, so it’s much easier for a certified arborist to cut and handle the branches. Even if the branches aren’t bare, like on pine trees, the frozen.