Thanks Lin, it might be since it's in the unheated greenhouse.
I didn't think of that Elaine, I found a 4lb box of Epson Salts in the bathroom closet after I read your post. I'll wade through the jungle after while, pull it out and give that a try. Wondering also if on nice days when the temperature is decent and there's full sun if it would benefit from sitting outside for the day. I guess it wouldn't hurt.
