Answer: Hostas may be deadheaded if you wish but it is not necessary. Some people like the blooms and find the seed pods decorative, other people remove them before the flowers even open. They will stay healthy either way, in my experience. Some hostas are naturally clumpers and others are naturally more stoloniferous and spread. Allowing them to bloom (or not) would not change that growth habit. Allowing them to bloom and set seed however could result in seedlings that grow in your garden nearby and this could make it seem like the parent plant was spreading out. The seedlings are easy enough to pull out. I hope this helps.
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