If the water does the trick, you'll be doing it forever. By the way, it
really isn't such a chore. Find a non-oscillating sprinkler, or even better,
get a soaker hose. Arrange it around the tree, turn it on for a few hours,
and walk away. Soaker hoses don't shoot water up in the air like a
sprinkler, so nothing's wasted. It's a slow oozing kind of thing. And,
they're useful in your flower beds, too.
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