An unusual little sedge to about 12ins high, with prominent white bracts beneath the heads of flowers - a bit like an umbrella grass (Cyperus) but with conspicuous 'flowers'. This is a wetland plant from warmer parts of the USA, often seen growing with Sarracenia (pitcher plants) in the wild.
In cultivation it is easy to grow in shallow water but likely to need some protection from intense cold, and shallow water that warms up quickly in summer.
Clump-forming - not invasive.
10cm pots ~ £5