Cut the bloom stems back but not the foliage. Do you cut off daffodil leaves before they turn yellow? The plant is rebuilding the its strength for the winter. I think it would look odd - all spikey instead of a graceful arch but that is an esthetic - no right or wrong on that point. The plant continues to make leaves so you'll be trimming until frost. You won't kill it if you cut it back, say by half, but will it bloom as well next year? I often run little "experiments" like this. Take notes in case you forget, like me, what you've done.
Answered on July 26, 2017
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