Regularly remove spent leaves and flowers. Plants that grow too tall can have their trunks pruned. This will stimulate new branches to form
Plants grown indoors will need periods outside to stay healthy, for example 6 months inside then 3 months outside.
Can be propagated. Take stem cuttings, with leaves removed from the lower 300mm and allow to dry out (in a cool place out of direct sunlight) before planting. They will take up to 6 months to establish. Strike cuttings in Spring to Summer. Plants can also be grown from suckers or from seed.
The sap of some species can cause skin irritation.
Some varieties include:
The spineless Y. elephantipes - in both its plain and variegated forms, has become popular for its architectural shape and its versatility – it can be used both indoors and out, grows to 8m tall in its natural habitat but in home gardens closer to 1.5 - 3m high.
Y. whipplei – known as ‘Our Lord’s Candle’ grows into a large rosette of very stiff blue-green leaves that after many years bears white flowers.
Y. filamentosa – known as ‘Adam’s Needle’ is widely grown, especially its yellow or white-margined varieties. It rarely grows more than 1m high.
Y. aloifolia – known as the ‘Spanish Bayonet’, which reaches 8m high.
Y. brevifolia – known as the ‘Joshua Tree’ from the southwestern United States, can grow to 12m tall.