Underground seeds are a rarity because most plants require pollination to develop seeds and flowers underground can’t be easily reached by pollinating insects or wind bourn pollen. It does happen though, one example is the peanut, its flowers are above ground, but as the seeds develop the peanut plant pushes them into the ground. I’m not sure what the evolutionary advantage of such a growth habit is.
I haven’t the foggiest idea if this is right– but I would guess the peanut and other plants that grow their seeds underground do so to protect them from being eaten before they are fully developed?
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