Nymphaea 'Hollandia' Koster (H)

Grow in undisturbed water in full sun. Plant in baskets in loamy soil with crowns just below soil surface and covered with pea shingle. Position basket so that it is covered by 15-25cm of water; as the plants establish gradually lower the plants to a depth of 50-70cm. Feed during the growing season with aquatic fertiliser at the manufacturer's recommended rate. See hardy waterlily cultivation for more advice

Deadhead and remove yellow leaves regularly

Propagate by division of rhizomes or offsets in summer, place pots in shallow water until established

May be susceptible to brown china-mark moth, false leaf-mining midge, water lily beetle and water lily aphid. See waterlily pests for more details

May be susceptible to brown spot, crown rot and water lily leaf spot