This is the third variety of Agave desmettiana that I have in my garden. The A. desmettiana ‘Variegata’, sometimes sold as A. desmettiana v. Marginata, differs from the others in that it has a creamy-yellow band along the leaf margins. The minute spines along the margins disappear when the plant gets older.
The margins differ from plant to plant. Some plants have a wider band of yellow, others less, so check all plants for your favorite variegation if you plan to purchase one. These plants do well in USDA Zones 9b-10, and are hardy to about 25ºF.
For more information on the A. desmettiana, see previous posts. The species name, desmettiana, is also spelled desmetiana.