How different pond plants grow and reproduce themselves:
For more details on how to do these repotting tasks: See Repotting a pond plant.
1. Rafting pond plants that grow horizontally across the water surface from a position on a pond shelf or ledge will send out runners or stems that extend the plant size and coverage. This is advantageous to the pond and to wildlife. They root out from the nodes (where the stem forms new leaf growth) into the water allowing the plant to be viable a long way from the original basket. Sometimes the plant can look straggly at the basket as all the fresh new growth will be some distance away.
To propagate plants of this kind: Cut back the stems with each cutting containing a shoot and a portion of stem with root growth during summer when the plant is in active growth and repot.
2. Upright plants can be divided when active by using a knife to split the rhizomes or root clumps if they grow too large or if the centre has become bare or dead.
3. Some upright plants will also form new plants from stem cuttings rooted from the original plant by placing a portion of stem with leaf nodes in water. These can be grown on in a new basket once they have developed roots of their own.
4. Bulbous plants will produce new bulbils which can be removed from the turions (the long stems which attach the bulbil to the parent plant) and replanted.
5. Some pond plants will set seed to form new plants.