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Products > Agave 'Risner Bill'   Agave 'Risner Bill' - Hardy Cow Horn Agave Note: This plant is not currently for sale. This is an archive page preserved for informational use.     Habit and Cultural Information Category: Succulent Family: Agavaceae (now Asparagaceae) Origin: Mexico (North America) Evergreen: Yes Bloomtime: Infrequent Parentage: (Agave colorata x A. bovicornuta) Height: 2-3 feet Width: 3-5 feet Exposure: Full Sun Summer Dry: Yes Irrigation (H2O Info): Low Water Needs Winter Hardiness: 10-15° F Agave 'Risner Bill' (Hardy Cow Horn Agave) - A medium sized rosette forming succulent to 3 feet tall with 2 foot long gray-green broad leaves that have prominent mammillate margins bearing reddish teeth that make distinctive bud prints on th inner leaves. Plant in full sun. Little irrigation required. Hardy to 15 to 20 degrees F. This plant was received as Agave colorata x A. bovicornuta from Mark Sitter of B&B Cactus Farm in Tucson and upon further investigation we have found out that the cross was made by Gene Joseph of Plants for the Southwest in Tucson who named the cross Agave 'Risner Bill'. The plant looks intermediary between the parent species with grayer leaves than Agave bovicornuta has and also lacking its characteristic cow horn-like teeth along the margin but also growing less upright in a fuller rosette of greener leaves than one expects from Agave colorata. The plant has proven to withstand considerably more cold in Tucson than Agave bovicornuta and so was a good replacement for it in colder areas. Gene Joseph also made the reverse cross (A. bovicornuta x A. colorata) that he named 'Bill Risner'.  The information on this page is based on research conducted in our nursery library and from online sources as well as from observations made of this plant as it grows in our nursery, in the nursery's garden and in other gardens that we have visited. We have also incorporated comments received from others and always appreciate getting feedback of any kind from those who have some additional information, particularly if this information is contrary to what we have written or includes additional cultural tips that would aid others in growing  Agave 'Risner Bill'.     [MORE INFO]