The thing about grow bags is that they are too shallow for the plants to develop a decent rooting system. They also dry out too fast.

The way to fix this is to use the grow bag on end, like a cylinder, and put one plant in the top instead. Chop the bottom corners off for drainage. This will give you a much better result.

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Do not meddle in the affairs of dragons, for you are crunchy and taste good with ketchup.