Water mint (Mentha aquatica) is a British native perennial that is an excellent plant for wildlife.  All the mint family are a valuable source of nectar for bees and butterflies and the foliage provides food for a variety of caterpillars.  Profuse tiny lilac flowers are produced from July to as late as October.  It is a vigorous grower so it is best to plant in baskets to keep under control and not recommended for very small ponds -for these Pennyroyal is a very good alternative

Height: 40-60cm

Planting position: Pond marginal shelf up to 30cm deep; or very wet soil in full sun or part shade

Form: 9cm litre in a solid pot

Recommended basket size min./ideal: 2 litre round/3 litre hexagonal

(Recommended basket sizes are for potting up 9cm (0.5 litre) plants only as these are supplied in solid pots.  Larger sized plants are already in aquatic baskets so can go straight in the pond, however they may need potting up or splitting at some point)