"Cereus-validus....." wrote:

Most of the succulent plants in cultivation aren't from Arizona and abiding
by their weather would not provide accurate info about how to care for them.

It would depend a lot on which part of Arizona, the high mountains or
the low desert or in between.

However some of the world's greatest succulent gardens are in Arizona:

Arizona Cactus Botanical Garden, Brisbee
Tucson Botanical Gardens, Tucson
Arboretum and Desert Arboretum Park at Arizona State University, Tempe
Arizona-Sonora Desert Museum, Tucson
Desert Botanical Garden, Phoenix

also, they raise a lot of roses and don't have any black spot.

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