honestly, miracle grow slow release formula works well for growing big plants with minimal effort (so i've heard). If you can give your plants a little more love, then something without any nutes is better so you can control the feeding yourself.

If you use rich top soil or loam or something like that to fill in your growing holes, you probably won't have to worry about fertilizing the plants at all, just watering. I'm planning on trying something like this in the future.

Gl!