I have a mulberry tree that's at least 10+ years old. The trunk is about 6-8 inches thick. It's beginning to fruit and I[m wondering if I'm wasting my time hand watering it. I don't have access to any other type of watering so I"ve been using my hose to water it for about a couple of minutes a week. Is this a waste, do the roots go deep enough to access water assuming we have no rain for a week or so? I live in Southeast Coastal Georgia so we usually have rain but this week, no rain.