Watercress

I sometimes forget that I have access to the worlds tastiest watercress. It's a slight exaggeration since I haven't sample the earths entire offering of watercress but out in the woods where I grew up there's a fresh water stream that wanders in and out of the properties, it's ground/spring water that's a steady 45 degrees all year round and this particular watercress thrives in it. I was walking by it yesterday and was reminded about this delicious beauty in the hot summer. You can see in the above photos that this coming springs new growth is starting to perk up. If black pepper could be a leafy green it would be this. Has any one else had any run ins with watercress growing in cold water in the northeast?