Bullrushes, 2 questions, what would uproot them, and why no flowerheads this year?

[difflock]

As above, I have noticed uprooted bullrushes,i.e. the roots floating, plus no distinctive flowerheads this year.

Guessing an otter might be responsible for the uprooting while attempting to dig out a frog?

But this is the first year with no flowerheads.

BTW The bullrushes seeded themselves and are now well established in the pond.

Cheers,

mth