Crinum : Greenhouse Plants
C – cool, minimum of 7°C (45°F) / W – warm, minimum of 13°C (55°F) / T – tropical, minimum of 18°C (65°F)
These evergreen bulbous plants with showy, often scented flowers, are easy to grow. Some, such as Crinum X powellii, can grow outside but still need a sheltered south border. Do not forget that if your greenhouse is heated there is a valuable asset in the borders that run alongside it. They will receive a good deal of frost protection from the heat inside. Such borders are ideal for trying tender subjects. C. asiaticum and C. makowani from Natal are more tender and are better inside a cool or warm house. Others such as C. pacificum need tropical conditions to do well. As plants are naturally found by water they can tolerate moist conditions when being grown warm. It is wise to give an occasional drier rest after flowering. Seed is simple to raise provided it is fresh. It should be sown in 8- or 10-cm (3- or 4-in) pots as the roots will be long. A temperature of 15°C (60°F) seemed ideal when I germinated some seed which had been brought back from British Honduras. Plants usually take four years to flower from seed. Offsets are often produced which can be carefully taken off and potted separately. I favour a loam-basedfor these.