I've never heard of watercress before. I thought maybe it was something that we call by a different name, because it reminds me a little bit of wheatgrass and it grows like chia. But no, it's called watercress here too.

"It is one of the oldest known leaf vegetables consumed by humans. Watercress and many of its relatives, such as garden cress, mustard, radish, and wasabi, are noteworthy for their piquant flavors."

Is the flavor very strong?