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This is my favourite cactus ever (of the two that I grow). It grows without protection in Toronto no problem. My drainage isn't even that good where I have it and it doesn't seem to care.
Pictures were taken in 2008 when it looked its best (It's really interesting to look through old pictures. Now I've got content for a few more posts as well!). Only a few flowers last year, with any luck we'll get a good show this year.