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How to get amaryllis to rebloom
Remove each flower as it fades.
Once a flower has faded, cut the flower where it meets the main stalk with a clean knife or scissors. Make sure to remove the green lump and thin green stem attaching the flower to the stalk.
This prevents the plant from producing seeds, which requires a lot of energy that could be going into survival and growth instead. Cut the flower stalks once they yellow or sag.