Quote:
Originally Posted by plugged
There's a chemical you can paint onto the inside of your pots that will make them stop growing before they get to the edge of the pot, and will make them turn and grow inward, forming a dense root ball. I forgot the name of it, I'll look it up later.
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It's called Griffin's Spin-Out, and the chemical that makes the roots act this way is called copper hydroxide. Spin-Out contains copper hydroxide.