The main difference is that you should prune these trees in the summer rather than winter so that they don't lose as much sap. During the 1980s and 90s, several researchers evaluated summer pruning in apple and peach. Summer-Blooming Trees and Shrubs ... Prune shade trees like oak, linden, and ash when they are dormant in winter. If you have trees in your landscape at your residential or commercial property we can help trim them. ‘When is the best time to trim these trees? Oak trees 3 years or older can be trimmed to a certain shape, but you must only remove branches that are growing towards the center of the tree. This prevents certain types of diseases. We will help trim your trees to look their best, avoid damage to property, and help you take care of your trees any time of year. To shape a juniper tree you will want to do light pruning before the new growth starts in the season. Thinning fruits can be regarded as the first stage of pruning, as it reduces strain on the branches. For arborvitae trees you can prune in early spring or mid-summer. If your tree is under 3 years old, you should only trim the dead or broken branches. When you trim it in fall, it may not give the tree enough time to stimulate new growth. Ash trees can range in size from small to extremely tall and large. For older trees, you should mainly trim them to remove dead, weak, or crossing branches. In comparison, waiting until summer to prune an elm can deter new growth and disrupt foliage production. If you trim your pine trees during the fall season, it can cause serious harm to the trees. Good soil preparation will help your plants grow quickly. Once the cold of winter sets in, the tree will want to continue to grow but the cold weather can stop it in its tracks. Before I started researching this possibility in more depth, my hypothesis was that summer pruning was a no-way-at-any-time. Ash is a tree that grows quite fast, and, in time, the trunk can grow to a width of over 3 feet (1 meter). Carol Lewis You can mix well rotted manure or compost into the soil before planting. Summer Pruning Plum Trees. I have several olive trees and 2 redwood trees that are in need of pruning. During the early spring, hard, thick tissue, known as callus tissue, develops rapidly over the areas you prune. The Best Time of Year to Trim Pine Trees. Tree response can vary when these aspects of pruning are varied. Certain fungi and bacteria can enter the tree via these wounds and cause the woody structure of the tree to decay. If they must be pruned in summer, avoid rainy or humid weather conditions. Shaping trees can also enhance light diffusion and air flow to the tree’s crown or to someone’s home or landscape. Sap beetles – such as the picnic beetle, dusky sap beetle and strawberry sap beetle – buzz around your yard from April to August and are most active in June and July. The flowers are white and showy in the spring with red berries that appear in the summer and last through the fall. In fact you should not remove or prune any trees until late this fall. Summer Pruning. The wrong time to trim trees. Check with your county extension agent or a horticulturist for additional information. Fireblight is a bacterial disease that can be spread by pruning. Suckers, water-sprouts, and crossing branches can be easily removed during the summer and energy will be directed toward remaining branches. Though it will not kill trees, winter weather -- such as wind, frost, ice and snow -- can damage young stems and weaken trees' health. There are over 65 species of ash trees (several common species are the blue ash, European ash, green ash and white ash). Do this in early summer while fruits are still small and can be pinched out with your thumb and forefinger. Avoid trimming ash trees in the summer, when stressed ash trees prove most susceptible to the ash borer. Leafage is a bit particular in that it appears quite late, around the month of May, but it will stay on the tree until the very end of autumn. They are often used as a shade tree. Summer is a good time to prune trees if you are looking to complete structural work or control growth. Ash trees are susceptible to ash tree borers and other pests and disease. I live in the San Fernando Valley in California where it’s very hot in the summer and usually we do not have a winter, just cool to cold weather. Allow evergreens to grow freely in late spring and early summer. Evergreens. Arborvitae can handle heavy pruning or shearing. This in turn makes future trims more dangerous. Otherwise, decay-producing fungi can infect healthy parts of the trees. With younger trees, cut off branches to shape the tree. Mike McGrath. 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