Question
I have several cottonless cottonwood trees.  They are on a drip
system, once a week for two hours.  They are growing tall but do
not leaf out very much.  The leaves are small and sparse.  Should I
feed them or what am I doing wrong.  They do have a mulch of leaves
around the trunk.
Thank You

Answer
I assume you planted these this year. Hardwood trees tend to grow a good root system before they add foliage. I would think this is the case here. I would fertilize with 10-10-10 fertilizer at he rate of 1 lb per inch of trunk diameter scattered around the tree and watered in good do this now and again in the sprung. This will encourage root and foliage growth.