On Sep 24, 2:37?pm, "W. Watson" wrote:
Isn't it true though that deeper roots add strength to the tree, that is,
hold it firmer in winds?

Less water, not more, is what encourages stronger root systems. Deep
watering of trees should only be done during extended periods of very
short water supply... and then no more than twice a growing season.
If a tree needs deep watering more often then that type of tree should
not have been planted there. Over watering is far more damaging to
trees than the occasional shortage.