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 Landscape design :: Pond :: about ponds :. Water plant propagation
Division

Plants with fibrous or creeping roots, such as sedges and reeds, may be divided in spring by levering apart the roots. Each division should have at least one terminal bud. Cut off the old roots and remove dead leaves. Trim new roots before replanting in individual containers and top-dressing with gravel. Cover the container with 5-7.5cm (2-3in) of water.

For plants with rhizomes, such as irises, use a knife to divide into sections, each with at least one bud and some young roots. Trim the foliage and long roots and replant with the rhizome almost exposed. For waterlilies cut the rhizomes into sections with two or three growth buds.

Cuttings

Oxygenating plants are propagated by cuttings taken in spring or summer. Cut off healthy, young shoots and insert into pots of loam. Submerge the pots. Cuttings establish quickly and may be potted up after two to three weeks.

Root-bud cuttings

Tuberous waterlilies and Acorus can be propagated from root buds or 'eyes' which are cut from the rhizome, while bulbils of plants such as Butomus umbellatus are simply detached. Pot up and keep just submerged.

Runners and Plantlets

Many floating plants, such as water hyacinth (Eichhornia crassipes), produce plantlets. These can be snapped off and placed on the water surface to grow on separately.

Turions

Some water plants, such as Hydrocharis morsus-ranae, produce swollen buds known as turions that become detached from the parent and survive the winter at the bottom of the pool. In spring the emerging buds float to the surface, where they can be collected and potted up.

The turions of Hottonia palustris grow from the mud in spring without floating to the surface. When they have developed into young plants they can be lifted.

Seed

Many water plants can be propagated from seed sown as soon as it is ripe. Use pots filled with aquatic compost and sow the seed on the surface, covering with a thin layer of grit. Just submerge the pot and place in a well-lit situation. The seed should germinate the following spring but may take three or four years to reach flowering size. Some species germinate more readily with gentle bottom heat of about 18oC (65F). 

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