I believe it was the 25 quart size soil bag. I used Miracle Grow Potting Mix, so I didn’t need to fertilize at all. I wanted three small units versus one big one so I could grow various things, in sequence; lettuces, spinach and arugula. I grew some Red Orach, too, but it ended up not being appetizing to me. Fuzzy leaves? Nope! LOL!
I chose the bags, then went over to the storage area to make sure the bag fit neatly on the cover/lid of the clear storage bin. I chose a clear bin with a black lid, thinking the black might keep the soil warmer. Also, these were kept INSIDE my unheated greenhouse, so I’ve never used these grow boxes outside....but I will start greens extra early this coming Spring!
This gal is a little wordy, but she walks you through the whole process in 15 minutes or so:
https://www.youtube.com/watch?v=7IXn2t8GLh0
Thx for the info + link. I set my Fabric Smart Pots in the plastic bins, so they can wick moisture from them during hot TX summers. I am eager to try this.
I also save the styrofoam boxes that frozen foods ship in, punch holes in the bottom, and root tomato, herb cuttings in.
Sometimes the cuttings never make it out. I am picking tomatoes in my greenhouse from some cuttings I never transplanted out of the styrofoam.