Q.do you trim allium foliage
I have a lot of foliage with the alliums that is flopping on the garden. Should I cut it back?
Floppiness seems to be an unfortunate trait of alliums. I have seen recommendations to plant it among other perennials, such as tall hardy geraniums, for support (or a clever disguise).
I wouldn't recommend cutting back all the foliage because your bulb's vitality depends on it. Your leaves absorb sunlight which is needed for photosynthesis which the bulbs need to create food to survive through dormant periods.
For more information on growing alliums, please visit the following link:
https://www.gardeningknowhow.com/ornamental/bulbs/allium/growing-alliums.htm