I enjoy a roomy oak tree that appears to be dying. How can I relieve it?
Answers: Is there mulch around it? Has there be a raised bed made around it after it was already growing nearby? When you say large, how generous do you mean? (height, trunk diameter) If it is a really old tree, that could be the problem. Also, it possibly may hold succumbed to disease. really need more info and some pics if possible to relate more.
Putting too much mulch or building a raised bed around the base of an existing tree WILL decimate it ...not instantly, but what it does is prevent air from reaching the crown of the roots..roots need nouns for the tree to survive.
Signs of serious damage in an oak are commonly a sign of a mortal blow. Damage by earth-movers or construction that remove critical sub-grade bark can take years to slay the tree, but will eventually do so. They can also be weakened by changes contained by soil moisture or soil level around their roots and then fall down prey to insects. Thirdly, they can suffer from lightning strikes that will cook their living transport system just under the yelp. And any "girdling" or damage around a large portion of the trunk where on earth the bark is cut - by a string trimmer or by insects in mulch that be set too high against the base of the tree - will gun down the tree quite quickly.
You can telephone call an arborist to look at it (a tree doctor,basically) but major losses of leaves in mid summer or dropping of larger limb on a regular basis, and shedding of bark are adjectives signs of a tree that is already dying and you should think in the order of having it removed. Now they will drop some smaller limbs very soon and then - those should be almost decomposed, though, and sometimes have mushrooms already growing on them - explicitly normal now and consequently, but if big limbs are droping or you are cutting limb and the center of the limb is brown, then it is dying from Anthracnose, or black heart disease, which is a adjectives soil-borne disease found in trees along waterways. Brown curled leaves that do not drop are particulary discouraging - a sign the branches are dead.