Sold in 9cm pots.
Variegated Mexican Lily. Similar in appearance to yucca, but without the deadly leaf spines. Blue/grey and yellow strap leaves. When mature it can produce flamingo pink flower spikes, with mauve bracts. Eventual height x width: 50cm / 1.6' x 40cm / 1.3'.
Care requirements: Grow in full sun and provide a free draining soil. Protect from wet and cold. 
Hardy if kept dry and in a sheltered location