I use it all the time and have for years, tho' mostly on indoor plants. I'm not sure how things would do without it as it's been so long since I started using it, but I really think they do better. Just a drop or two in a gallon of water, ten drops when starting cuttings, and a very dilute dose of fertilizer.

The man in the garden center talked me into a bottle last week. So, I am experimenting. Am putting it on one of 2 rosebushes on a trellis and will see which one does the best. Also, putting it on some poorly looking arborvitae--which is what he recommended. We shall see.

For the record--I have two big pots of rosemary. Need to have one in tip top shape for the celebration of Blessing of the Herbs on August 15. It will be in the center of the church altar (an old European custom done at herb harvest time.)
I put Super Thrive on one of the pots and not the other. The one with the ST is now greener and has hundreds of flower buds. So, it may just work!!