The leaves should remain on the plant while they are still green.
When Should You Cut Back Amaryllis Leaves?
Growing Tip
Cutting back the leaves is optional.
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Cutting back the leaves does not harm the plant as long as it is done at the right time.
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Cut the leaves 2 inches above the bulb, using sharp sterilized pruners or a knife.
The Spruce / Adrienne Legault
Afterward, you have two options for what to do with the bulbs.
What Should You Do With Amaryllis Plants in the Summer?
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Amaryllis thrives in the sun.
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And a third optionflower stalks and leaves growing at the same timeis also possible.
Growing and Caring for Amaryllis.
University of Minnesota Extension.