Yuccas are not true succulents but have become adapted to very harsh arid environments in the deserts of southern America and Mexico from where they originate. There are about 40 species. All are slow growing, most, in maturity developing a trunk topped with a rosette of spirally arranged leaves. They range in size from stemless clump forming species such as Yucca glauca, to 8m high multi-branched trees such as Yucca aloifolia. Yuccas need good drainage and full sun and are fairly frost hardy. They make a good container plant and given plenty of light can be grown indoors. Their leaves are sword like and tipped with a sharp spine. In summer they produce showy panicles of white or cream, bell shaped flowers on spikes up to 3.5m long.