FLOATING - Water lily, common water-crowfoot, frogbit.
POND EDGES - Marsh marigold, globeflower, pillwort, brooklime, watermint, lesser spearwort, water forgot-me-not.
SUBMERGED - Water violet, rigid hornwort.
Gardenis.co.uk sell 3 sizes of preformed pond;
Small - 85 litres is about the size of a large Belfast sink (£30 inc UK delivery)
Medium - 200 litres is about the size of a small bath (£48 inc UK delivery)
Large - 420 litres, the surface area of an average fireside rug. (£78 inc UK delivery)
(Delivery is usually 1 to 2 days excluding weekends)
Once complete, children can monitor the pond over the next few years to see if it has any attracted any wildlife, such as frogs. Ponds are not suitable for gardens of homes with very young children, eg 3 and under. If one is installed in such a garden, it should be in area only accessible behind a fence, with a locked gate that only adults can open.