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| 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 |
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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 about this plant that is conducted in our nursery library, from online sources, as well as from observations made of this plant as it grows in the nursery, in the nursery's garden and in other gardens where we have observed it. We also incorporate comments received from others and welcome getting feedback from those who may have additional information, particularly if this information includes additional cultural tips that would aid others in growing Agave 'Risner Bill'.
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