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I'm considering buying this Echinocactus horizonthalonius. It's supposed to be one of the only (if not the only) Echinocactus that will bloom when small, young and in a pot. It must already be a few years old too from the size of it. The flowers are large and pink in the spring. Fragrant too apparently.
The thorns are pretty cool looking for the rest of the year it isn't in bloom.
Very tempted... It is expensive but it looks like it's already a few years old so maybe it's worth the price.