When researching edibles that would do well in low water conditions, I bumped into Prickly Pear Cacti of the genus Opuntia. Turns out there are even natives that grow nearby. Most of them seem to have small or dry fruit though my understanding is that you should be able to eat the pads of all of them. This would be tricky with my fragilis as it is quite small and a challenge in learning how to process the rest. They are cool to grow regardless.
All about growing, selecting and using edible plants in the Ottawa valley.