Thelocactus setispinus formerly Hamatocactus setispinus is really a thelocactus. These small little barrel cactus get large yellow flowers during the monsson summer months and then is followed by little red fruit. These plants have taken -16.6F in our garden and like being on the dry side in winter.
I do not guarantee these in a zone 5/6/7 because everyones growing conditions are different but this would be a good trial plant to grow in your cold outdoor garden. Try to plant outdoor 90 days before 1st hard freeze.
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