I've grown a lot of black-eyed susan vines and they've all been started indoors on a heat mat. Results have varied for me, a lot. I have bought all my seeds for them from the same place. One year I got near 100 percent germination, the next only 25 percent. I'm thinking this plant needs really fresh seeds and there is really no way of knowing how fresh they are when you buy them. I have had really mixed results with MG's too. People see my seed trays and think I have some magic touch, I tell them "no I just plant mass quantities".
