I have a lovely little japanese maple on the side of my house here in Flower Mound, TX, and it's been suffering from drought (I can only assume - Douglas is the absolute expert...) We moved into the house just 6 weeks ago, and I don't know how long the tree's been suffering. Would it be advisable (along with regular watering via our sprinkler system) to put one of those watering bags on it? Any other hints to help this tree back to life? We've seen some improvement in the leaves since we moved in (I don't think the previous owners cared to turn the sprinkler system on with much regularity). Should I be adding any special fertilizers or anything?