I sprinkle the dry granules into the backfill soil and then water the heck out of the tree. The granules absorb the water and hold it in the soil longer. It's not dipping the roots, but at least for me it seems to work. I've had very few dry up. When I plant, I come back over the trees 3 or 4 times during the day I plant them and hit them w/ more water. It gives a more thorough soaking instead of all running off. I think that helps.