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| Category: Succulent |
| Family: Agavaceae (Agaves) |
| 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'.
This description is based on research and observations of this plant as it grows in our nursery, in our nursery garden and in other gardens that we visit. We also incorporate comments received and appreciate getting feedback of any kind from those who have any additional information about this plant, particularly if they disagree with what we have written or if they have additional cultural tips that would aid others in growing Agave 'Risner Bill'.
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