I agree that the blood meal idea is tricky because it's very hot in N. I'd rather see a more balanced fast acting liquid fertilizer that covers a good part of the macro and micronutrients because N probably is not be the only deficiency. That's why I suggest the fish or fish/kelp. A plant in a little pot can use up what was available in the soil pretty quickly and the roots and the microorganisms can't go any further in search of nutrients.
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