Q.Deadheading
When deadheading an allium plant, should I just cut below the purple or white “globe” flower OR should I cut all the way to the bottom of the long stem?
Certified GKH Gardening Expert
Either way will not hurt. Some plants are sensitive to removing flowering hormones, but this will not be the case here.
What I do, is cut the bloom first. Then, once the stem has died and the plant has pulled back the nutrients and hormones, I will cut the rest of the stem.
This collection of articles will help you to grow Alliums:
https://www.gardeningknowhow.com/ornamental/bulbs/allium/page/2