Flowers should be removed when petals begin to fade, so they will not go
to seed. If seed pods are allowed to remain, they will draw off the food
needed to nourish your bulbs
for next year's growth. All petals should be removed from the blooming area after
they have fallen. Even where bulbs have been naturalized in
a lawn, leaves should not be cut until they turn yellow and whither
naturally. While they are still green, the leaves serve as a source of
nourishment to the bulbs.