Cacti and Succulents for Cold Climates by Leo J Chance
Apparently Leo has been growing tons of varieties of Cold Hardy Cacti in Zone 5 CO for over 30 years. He talks about absolutely hundreds for varieties describing them, where they originate from, how they tolerate cold/wet protection mechanism's. Really nice photo's definitely worth a read.
Interesting book on Cold Hardy Cacti/Succulents/Agave
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