One of my 3 mature in ground Satsuma trees is not doing so well (I also have 6 more younger 1-3 year in ground citrus trees, mostly Satsuma varieties) on th3e 8b/9a line in Louisiana. This particular tree was planted about 20 years ago and is located about 200 feet from the nearest other citrus, in a more exposed wetter part of the yard. It has never done as well as its contemporary aged Satsumas, reaching only about 8 ft in height and maybe 10 ft in width. This tree was hit hard with freeze damage 3 years ago and lost the northern third of the tree as well as some limb damage all around, then was hit again with freeze damage this last January even though it was covered and had a heat lamp during our 40 year low with 13F two nights in a row, this time with only minimal additional dieback but it did loose about 80% of its leaves. In general this tree is looking scraggly, it has leaves and fruit on it, but the foliage is not as dense as it should be, with only about 70% of the leaf density of my other large Satsumas, and maybe 1/3 of the fruit set.
Which brings us to the big question, what should I do, leave it as is, cut it down, prune it back considerably, etc?