Thanks to the Monarch Watch Forum and other similar websites, we have the opportunity to share techniques and practices largely borne out of trial and error. The education pages are invaluable for keeping all us abreast with the newest research such as the benefits of using native milkweed and drawbacks of using non-native varieties (particularly tropical). I will defer to the actual researchers on milkweed education. Articles on the interplay between tropical milkweed and migratory habits are fascinating. The harsh winter of the past year and large loss of habitation have created a monarch tailspin. Most of us are adapting and changing our established practices. As I mentioned in the original post, new monarch rearers in our inner-ring suburban neighborhood often like to take a container grown common milkweed home with their cat. They can chose whether to keep the plant as a container grown or transplant to the yard, if they have one. Common milkweed has a wonderful bloom but unfortunately is very aggressive. For my own yard, I grow it along a fence in a contained area. I did like having the pots for backup food. My cats hatch, grow, emerge and prepare for flight on my screened in porch. Every once in awhile a monarch is unable to fly due to a damaged wing. I have had a couple live their life span on the porch hanging out on the plant and feasting on watermelon below. I will give a plug here for milkweed as a desirable plant for anyone to grow. It would be great if even non-rearers would consider growing native milkweed. The bloom on the common provides a fabulous aroma. It requires next to no care and may even draw in some monarchs to the yard or patio. It will take over a flower bed so for many gardeners without the luxury of a dedicated bed, container growing is the best option. Up until this winter the plants over-wintered just fine in the pots outside in zone 5. Now I would recommend over-wintering with some protection.