I have used Superthrive with Miracle gro but not as much as I use MG. I like to use it more in the hot weather. It gives them a pick me up. There is no PNP rating on the bottle I have. That kind of scares me. So. for me not as my #1 fertilizer. I honestly thought the old guy was drinking it himself he was super charged at 93.

I thought the one that Al recommended was Dyna-Gro Foliage Pro. That is the one I have.

Dyna Gro was bought out by Superthrive. I have major reservations about Superthrive as the original Superthrive formulation was just a bunch of hocus pocus ingredients and some natural plant hormones. But it is what it is.....just make sure the jug says Foliage Pro or Grow on it to make sure you are getting a real fertilizer.

FWIW, I use the Foliage Pro 9-3-6 formulation on all my containers, indoor and out. And since my entire outdoor garden is grown in containers, that means everything, including hostas, receive it weekly or biweekly all through the growing season. I apply it with a watering can and it is a bit time consuming with that many containers to fertilize and water but it is manageable.

Interesting that Dyna Gro was bought out by Superthrive.

As a container grower gardengal, how much of the fertilizer do you use when you water? I've never really understood how much I was supposed to use. Always wanted to ask that question.

I use the maintenance level - 1/2 tsp per gallon of water. Weekly, weakly :-))