My computer is broken so I haven’t been able to regularly update. I was able to expand thesize of my garden by 6 x 12 feet. I filled thespace with mounds for zucchini, cucumber, watermelon and squash. It’s been really dry so I’ve had to water with the hose almost daily.
Well I keep gardening spilme. So to me all this potting mix, container soil and that is just for people who want to get maximum results. I use regular dirt from the ground, compost and some vermiculite. I even grow stuff in seaweed so . I guess you could mik potting soil and compost in your boxes and be allright.Keeping thing spilme makes gardening fun. hope it helps!