When I've done it before, I find they tend to come away fairly easily if you give them a good tug.
I have two little floating islands of them which were beyond my reach last year and have kinda worked free from the bottom, they move about with the wind. ( new chest waders will bring them within reach )
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Maybe trunks and a snorkel? Dive and cut the iris off at the roots if you can't pull it up?
When I've done it before, I find they tend to come away fairly easily if you give them a good tug.
I have two little floating islands of them which were beyond my reach last year and have kinda worked free from the bottom, they move about with the wind. ( new chest waders will bring them within reach )