Yuccas are divided into three distinct types as described in 1, 2 & 3 below. As well as regular feeding with 'Blood, Fish and Bone' (for example) to get lots of lush growth, by far the most important part of successful Yucca cultivation is the oft mentioned technique known as BROWN BITTING - removal of the spent flower spikes before they are fully faded (to prevent unsightly build up of rotten old flowers) and removal (by cutting) of unsightly, dying or dead leaves:

Those that form a trunk and branch after flowering:
Those that form a clump of several trunkless plants together. When an individual within the clump flowers, it dies, to be replaced by a new plant from underneath: Yucca filamentosa and Yucca flaccida - two rather unexciting plants, neither of which we sell.
That which forms a short trunk and does neither after flowering - it just carries on as if nothing had happened:

Recommended Essentials:: Yucca aloifolia; Yucca aloifolia variegata; Yucca gloriosa; Yucca gloriosa variegata; Yucca recurva; Yucca x floribunda