A long time ago I came across a concoction posted in the garden center of Wal Mart to use on ferns. I know one of the ingredients was epsom salt... there were a few other ingredients but I sure don't remember what they are; Had it written down somewhere... well ya'll know how that goes... lol Anyway, if anyone knows what the ingredients for this "tonic" are ... I would greatly appreciate it. It works pretty good on greening up ferns. thanks, dee