To propagate water hyacinth, the most common method is to simply detach and separate the “runners” or stolons that grow out from the main plant, which are essentially small daughter plants, and then place them in a new body of water where they will root and grow independently; this is considered vegetative propagation as the plant doesn’t need seeds to reproduce in this way. 

Key points about propagating water hyacinth:

Use sharp scissors: When detaching the runners, use sharp scissors to cleanly cut them from the parent plant to avoid damaging the new plantlets. 

Check for new growth: Look for visible new growth on the runners, indicating they are ready to be separated. 

Consider invasive nature: Be aware that water hyacinth is considered an invasive species in many regions, so always check local regulations before propagating it.