Then, short rhizomes develop to produce a tuft of any shoots. Also reproduces with stolons. Young roots have been observed developing near stolon tips. A prolific seed producer. Shoots can be spread by fragmentation.
Ice can break off old shoots with associated roots.
Shoots may be transported by water and caught by floating mats or end up on the shore. These shoots can root from the base and establish. There is a decrease in root biomass, and most energy is allocated to height increment . In July, when almost at its full height, energy allocation is shifted to shoot production. Shoots emerge between July and August but may emerge in autumn also.