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| Ferocactus x californicus, a natural hybrid of (Ferocactus peninsulae x Ferocactus rectispinus) |
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| My Ferocactus x californicus variety walmarticus, appears to be hardy to about 18F degrees, and starts to scar along the ridges from freeze damage below this temperature. |
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| Fire Barrel Cactus (Ferocactus gracilis) - Some varieties are hardy to 15F degrees. |
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| Both of these Ferocactus are painfully slow growers putting on only two or three tubercles a year. |
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