I've rarely seen such a difference between a plant grown in the ground vs a black container as I've seen with eggplant and sweet peppers.
I have the eggplant in 5 gallon grow bags in a mix of commercial potting mix and composted cow manure. That's it - I do feed weakly each week or so - once it gets warm, the plants just shoot up and my yields are impressive. I end up watering essentially daily as well.
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Craig
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