I used 4 10L airpots on my wilma before and they went well, wouldnt sit in the tray though without butchering some of the plastic away first. Yeah bud done summat similar with the garland trays over his big wilma 9 res mate. Youd need to support the trays with some battons or shit to handle the weight.
If ur sticking to coco and want decent size plants 10l will do but for phat old girls u want 15L minimum realy mate and if ur trying to encourage the roots to come out the base of airpots to go in the main res id fuck the airpots off all together and just use netpots with clay pebbles. The roots will be in res in less than a week and then theres no faster growth than that unless you go down lpa or hpa route
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