Frosty watercress growing in our pond; it all started a few years ago when Rachel said one day “that looks just like watercress” as we sat on the side.
“try tasting it” I suggested.
“Errr no thanks, not my cup of tea”
And so I tasted it and sure enough, watercress it was. Lots of it, taking over in fact.
Rachel had a while beforehand, planted some cress in a near by pot and all we can guess is that some of those tiny seeds had drifted across and got established before our very eyes.
So it seems that our watercress is really good for us. Having circulating water helps by means of the pond pump and its always nice in a salad, or as Rachel puts it so nicely, a compost sandwich.