DrGribble
Well-Known Member
6" are plenty, you don't need anything bigger and you'd be fine with smaller even. I use the 6" netpot lids and there's no conceivable way I'd ever need anything larger unless I was growing 5lb trees... I use 1 or 1.5" starter plugs and clay pebbles easy breezy. As you can see from this photo taken today I'll never even come close to using that whole 6 inches of space.