Neomexicana & Havardiana are some of the most cold hardy agave species in existence, able to withstand temperatures down to -20 degrees. Deborah says that no North Texas winters will affect these agaves! She loves the look of the Neomexicana and thinks the dark burgundy, almost black tips add a lot of interest to the plant.
Neomexicana
Havardiana
In sharing my demise and failures in growing agave through the years, please bear in mind that cold hardiness depends on more than just temperature. For the majority of agave species, the most crucial factor aside from the absolute air temperature is how wet or dry the soil is when a cold spell hits. Completely dry soil allows agaves to withstand colder temperatures than they would be able to tolerate if the soil is wet. The worst-case scenario would be a deep freeze following rain, especially if the soil is heavy and has poor drainage. (common in the upper and mid south states)
You can give your agaves the best chance at winter survival if you plant them in loose, well-draining soil. Many gardeners aren’t blessed with such conditions so don’t be frustrated. Agaves have a shallow root system so you only need to amend the soil to a depth of 8-12 inches. Adding coarse inorganic material such as pumice, decomposed granite, chicken grit, or even small rocks or pebbles is a great way to improve your soil. Better yet is to plant agaves (and other succulents) on a slight mound so the rain runs off more quickly
* Lloyd in NW Iowa has explored many routes on the hardiest agave in America and he might share another species or two if he see's this. One thing is sure, they are fairly rare, often seen sold-out, and can be decently or outrageously priced. Living in the world we do as of today and if your wanting one, you should be looking this season. Thanks.
Agave Hall of Fame for cold hardiness:
Agave Utahensis
Agave Montana, is one of the best choices for cold and wet winters
Agave Parryi (several subspecies)
Agave ovatifolia, the whale’s tongue agave, another of the best choices for cold and wet winters.
Agave neomexicana
Agave harvardiana
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