Glad I spotted this thread... I just got a pot full of black gamecock last weekend, and spent today trying to tease apart bundles of bulbs. I noticed it seems like a much smaller plant than my other irises, but I've been setting them in between the rocks around the edges of the pond, where their roots are directly in the water. Not sure if they will still bloom this year (some irises are temperamental about that), but by next year they'll be fully established. Can't wait to see the show!