OK, I just purchased from Rose Franklin's Perennials & Herbs their special Tropical Milkweed. I will put it in my Greenhouse and see if it grows and hopefully, the Monarchs will find it and enjoy a snack. Thank you for your help. I may just give them a try sometime if I could be sure they had enough to eat here on this farm. We are not really set up for much of a butterfly garden. The neighbor's field is a better place than our Christmas Trees. I am going to learn all I can and then I will see what happens after I am sure I can grow the Milkweed. I remember as a kid we had milkweed all over the place but now is another story.