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Originally Posted by Clare_CA
Interesting. So they can be too hot. My plumerias love the super high temps, but I guess that is not so of bananas. Richard, 12-gallon containers seem very large for small pups and a sword pup. Wouldn't five-gallon be better? Maybe I should show you the plants when I get them before I pot them up. I do know that overpotting can lead to soil that stays too moist and rot ensues (been there; done that).
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If the corm is tennis ball size, then 12-gallon squat should be just right. Try a soil mix of 1/3 perlite, 1/3 fine-grained compost, and 1/3 your local sandy soil. Leave room for an inch or so of 1/2 diameter mulch (not compost or coir) on top of the soil after you pot the plant. From now until spring feed them something like 10-20-30 or small doses of Sul-Po-Mag.