My Calla Lily bulbs are planted in a pot every spring (I bring them into the house in the winter and store them in a cool dark place). During the summer they get many blooms, but only a few of them turn white. Most of them remain green. I occasionally fertilize them and I try to keep them watered sufficiently. The plant itself is lush and looks very healthy in all other respects. Why don't the majority of the blooms turn white?
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