I don't know what kind of watercress I get. SUPER cress I suppose.
This stuff grew in the waterfall and out into the water. The water was
turned off last fall so the stems are all brown but the stuff in the
water kept on going. It got frozen in the ice all winter, snowed on and
generally abused.
It is growing gang busters right now. We're zone 7a.
That said, it is acclimatized.
I don't know if stuff from the store right now would do as well but
since it is fairly cheap I'd give it a whril.

kathy