Crinum is a half hardy bulb, that is often grown as an annual by gardeners.
Crinum lilies bloom in the late summer. They have lily like flowers of red, pink, or white. These appear atop stems that are 45 to 90 cm (18 to 36 inches) in height.
Crinum powellii - Cape Lily by Drew Avery.
Common names for Crinum plant members include Cape lily, Bengal Lily, Crinum Lily, Spider Lily, and Swamp lily.
Their beauty makes them ideal to grow as solitary plants.
Crinum asiaticum (Giant Crinum Lily / Spider Lily / Poison bulb), photograph by Forest and Kim Starr; CC.
Crinum latifolium (Pink-striped Trumpet Lily / Wide-leaved Crinum Lily), picture by Dinesh Valke; CC.
Crinum americanum (Florida Swamp-lily / String Lily / Southern Swamp Crinum), picture by Rictor Norton & David Allen; CC.
Crinum × powellii (Swamp Lily Hybrid / Cape Lily Hybrid), photograph by eonora (Ellie) Enking; CC.
Cape Lily and other lilies of the Crinum genus can be grown either from seed or bulbs.
If growing from bulb then they should be planted at a depth of 20 cm (8 inches) at the end of spring.
If you plan to grow Crinum plants from seed, then you should use fresh seed as soon as it is ripe, and sow at a depth of about 6 mm (1/4 inch).
The plants should be spaced between 45 cm (18 inches; small species) to 80 cm (32 inches; large species), and grown in a sunny area of the garden.
They like to grow in an humus rich moist soil that is well drained.
If you first plan to grow Cape (Crinum) lilies indoors, then fresh seed should also be used.
It should takes from one to three weeks to germinate lilies. Ideally grow at a temperature of 15 to 20 degrees centigrade (59 to 68°F).
Members of the Crinum family are not the easiest to look after. They should be fertilised about three times a year.
The leaves and flowers should be cut off once they have died.
If you live in a very cold area, then the bulbs should be removed from the garden in the autumn and stored indoors in a cool place.
It may take as long as five years before you see flowers from your seed-grown Crinum lilies.
I hope that you enjoyed this guide on how to grow Crinum plants. You may also enjoy the following Gardener's HQ Amaryllidaceae growing guides: How to grow Allium schoenoprasum, Jersey Lily, and Amaryllis plants.