It could be Opuntia basilaris( beavertail cactus).
Allen
You don't have to be crazy to grow palms in Alberta..... But it helps
I think it is probably Opuntia phaeacantha. It grows equally well here in zone 4b/5a!
Allen, if you want to try a few pads in Edmonton, let me know this spring!
Thanks for the offer Paul.
I'll contact you in the spring.
Allen
You don't have to be crazy to grow palms in Alberta..... But it helps