should be planted after the middle of April and during May and June. Firm planting is essential. Pressure should be applied around the . To prevent the plants from rising as the water runs into the pool place large stones around the plants and leave them in for, say, six weeks. It is always better to cover the plants with only a 100 mm (4 in) or so of water until growth commences and then as the plants progress the pool may be filled. If hardy species of are grown, they will stand all the frosts experienced in this country. There are many different varieties of water lilies. Some need 300 mm (12 in) of water and will cover an area of 600 mm (24 in) square, others need 600 or 900 mm (2 or 3 ft) of water and will cover an area of from 2 to 3 m (7 to 10 ft) square. Good varieties for small pools are:
CHRYSANTHA A yellow tinged with red.
GRAZIELLA A coppery-red to orange yellow. TETRAGON A ALBA A white which can be grown in a pool only 150 mm (6 in) deep and 375 mm (15 in) across.
For the larger pools I recommend:
ATROPURPUREA A deep crimson with yellow stamens.
INDIANA A yellowy-orange to coppery-red.
JAMES BRYDON A crimson pink with golden stamens. COLOSSEA Very large pale pinkfrom May until October. It needs plenty of room.