Description of Nymphaea 'Formosa'

Nymphaea 'Formosa' is a hardy water lily bred for garden ponds, producing summer flowers over a steady raft of pads. It grows from a rhizome and expands as a clump in a basket. Some listings describe it as a larger, free-flowering cultivar, so it tends to look best when you give it space. Most gardeners call it simply Formosa water lily, without any extra common name.

Appearance

The pads are rounded and create good surface cover, with young leaves sometimes showing warmer tones before they turn green. Flowers open in daylight and show medium pink petals that deepen towards the centre. Many descriptions mention fine flecking on the petals, which gives the flower a textured look rather than a flat block of colour. A light fragrance is often reported, especially on warm days.

Care Guide

Plant Formosa in still water and full sun for the best flowering. Use a wide aquatic basket with loam based compost and top with washed gravel. Lower the basket in stages and aim for a medium to deeper position once the plant is established. A useful working range is around 45–90 cm over the crown, adjusted so pads reach the surface without stretching. Feed with aquatic fertiliser tablets from late spring through summer. Remove yellowing leaves and old flowers to keep the plant open and reduce debris. As a hardy lily, it can overwinter outside when planted below ice.

Suitability for Garden Ponds

Formosa suits medium to larger ponds where you can spare a decent patch of surface room for pad cover. It gives shade and shelter for fish and helps reduce light penetration in summer. The flecked flowers look best when you can view them close up from the pond edge. If your pond is small, keep it in a basket and divide when the pot fills. In ponds with fish, a gravel cap helps stop compost being disturbed around Formosa. If Formosa makes lots of leaves but few flowers, feeding often helps more than changing depth. In ponds with fish, a gravel cap helps stop compost being disturbed around Formosa. In ponds with fish, a gravel cap helps stop compost being disturbed around Formosa. If Formosa makes lots of leaves but few flowers, feeding often helps more than changing depth. Clear floating debris so buds on Formosa can rise and open cleanly at the surface. If you lift Formosa for repotting, do it in late spring when new shoots are obvious. If you lift Formosa for repotting, do it in late spring when new shoots are obvious.