Pretty vicious as in pretty vicious, not pretty and vicious. Pretty hardy.
Yucca aloifolia 'Variegata'
Same as above - more pretty but no less vicious.
Makes a nice pot plant when grown from seed.
The house-plant yucca. Survives mild winters and is very cheap to replace if it dies. A non aggressive yucca.
The hardiest of yuccas. Not a great performer in pots.
Attractive when grown in a pot. Once again - mean spikes.