CactiGuide.com

I have a very healthy, smaller specimen, which I have in a filtered sunlight area in my backyard. Seems to like the location and so far is thriving.
My question is about watering. I know they don't require much, and have heard a couple different theories. One is only in October when they supposedly flower and very little at that. Its planted in a well draining limestone substrate.
Temps here btw, can get up to 105 in the summer to freezing in winter.

Thanks.
Dave

It needs regular watering in summer, none in winter. The flats where those grow can can turn muddy from summer storms, they can take quite a bit of water then, but they're rot-prone in cooler seasons. Rather than watering only in October, you should be reducing its water then.