Y. filamentosa. Some Yuccas are said to flower only once in seven years, but Y. filamentosa seldom misses a year, given a sunny place and well drained soil, once it has become established. This is a subject for isolation, where its symmetry can be appreciated, and when in flower during July and August it is an imposing sight with its ivory bells on spikes 4 or 5 feet high. The sharp pointedof this species has small drooping loose threads along the edges, and being evergreen, the woody lengthens with age. Plants will however produce suckers from the which in time mature to make a single plant become a group. When planting in autumn, a collar of litter should be placed around for protection over the first winter, but once established it can take care of itself.