Answer: I really can't say "why" something like this happens. It's likely some kind of adaptation, probably to allow the plants to photosynthesize and build up food reserves in their bulbs in the fall, so they have the energy to flower in the spring. It is interesting, isn't it?
Grape hyacinths are related to other hyacinths, but they belong to a different genus, Muscari. This might explain why they behave a little differently from their cousins. They do offer a welcome sight after a long winter!
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