I've used that and other PHC products with great results. I know several certified arborists who utilize PHC products in their work, mostly to improve the chances for trees that have suffered construction damage, compaction, or severe neglect. Most use it with new plantings, as well.

I worked with the former chief scientist of PHC, Don Marx on an experiment that was published quite some time ago in The Journal of Arboriculture. I knew Don very well, and spent a lot of time studying under him.

I bought a 1 lb. bag and was wondering how much to use per plant. The way I figured was little less than an ounce for each gallon of water , and use that on each plant. Is that about right. I see some results from the product when I applied about 3 months ago. But the one blueberry plant that I was hoping it would help has still not turned around. Any advice would be appreciated..