I have a sick tree with with carpenter ants already and a particularly difficult treatment problem. It is in a flower bed with ground cover, very close to the house and has a driveway on one side and a sidewalk on another. This condition makes it almost impossible to use the recommended sick tree treatment. Any ideas?

Where are you, what kind of tree? Are you an organic gardener, what have you tried already? Do you have a watering system in your yard?
This information will help a lot in offering some recommendations.