Answer: Container grown plants need regular fertilization when they are actively growing. Bananas in particular need a rich soil. I would suggest using a slow release granular fertilizer such as 10-10-10 plus minors for all three, read and follow the label directions for how much to use. You could also top dress with compost. For the banana, I would also use a water soluble fertilizer every other week during the growing season, per the label directions.
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