I was looking for cuttings that were between 2-4 inches in length and green. Birch trees can be grown from seed, but it is a long process. jbug1960. Softwood cuttings are done in summer, while hardwood cuttings are done in winter. For these birch tree cuttings I wanted the green stem tip growth. Here are a few pieces I trimmed off initially. Pruning should not be done between May 1 and Aug. 1, the flight period of the birch tree's greatest pest enemy, the bronze birch borer. North Carolina State University recommends the rooting of stem cuttings as a means of propagation for woody ornamental plants and some species of trees, including elm, crape myrtle and birch. But all other types of dogwood trees, including the flowering dogwood and pink dogwood, follow the same routine and care. They can be propagated by seed, but the trees produce a low yield of seeds and cones. The trees are fast-growing hardwoods. The beetles are attracted to … Branches that rub together offer entry points for insects and disease, so remove one of them. Insects tend to target birch trees where they are cut or damaged so keep trees free of damage and avoid excessive pruning. Take your cuttings of dogwood to start a tree in late spring or early summer, and allow it to grow enough to be a sapling to be planted in the ground when autumn comes. There are several reasons for cutting back birch trees: Remove dead, diseased and injured branches for the health of the tree. cutting back river birch tree to trunks. River birch grows in U.S. Department of Agriculture plant hardiness zones 4 through 9a and cuttings from the tree propagate readily. ... Keep in mind that when you top vigorous trees they just grow back, this time with an ugly shape, possible rot in the trunks (quite likely with a birch) and poorly attached replacement trunks which may break away from the original trunks later. Softwood cuttings show the greatest success. Larches are easy to graft and therefore easier to grow vegetatively than by seed. they still have some of the older wood material from the birch tree. Reasons for Cutting Back Birch Trees. Branches that grow nearly straight up have weak attachments to the trunk.