Several times a year, thoroughly soak them (slow running soaker hose spiraled around the base all the way out to 3 to 5 feet past the edge of the branch canopy) until the water has penetrated 12 or more inches.

If they are in a lawn area, you can use the sprinkler system - run it 15-30 minutes a day for about a week, check moisture depth.

Do this at the start of warm weather and once a month or so (depending on how they look) until is cools off. Especially the hot dry June.

I planted this 5' Afghan Pine 6 months ago and it was doing fine. Someone told me to water it with a soaker hose every two weeks for about two hours. My soaker hose is wrapped arond the tree at the drip line and beyond. Therefore the trunk/root area didn't seem to be getting enough water because the upper most branch along with two others have dried out. I am now soaking around the trunk for 3 hours every 4 days. Does anyone have any suggestions?