I know I'd have a container garden, long as I had a couple of feet outdoors to set them. Not being familiar with the plants in your zone I don't have much advice, but I don't see why it would not work!
kelly

Monarchs will locate milkweed in a container garden, if you have enough plants for them to home in on. Four or five plants is good, 10 is better. Milkweed does not like to be dug up and moved after it has leafed out, but maybe your plants are still dormant? You might end up with potted milkweed from a greenhouse, which could be toxic to butterflies during the first month, if they have been sprayed with insecticide. Eventually the plants should clear of any artificial toxins that were previously applied.

Hello, I think the best milkweed for potting is tropical and unlike other milkweed, it's easy to transplant. Good luck, Tony

Well, I'm heading out to dig up. The ones I will remove are all Incarnata and are a year old. Last year I did move and divide a five year old Incarnata without issues, so I will try it with the younger plants and see what happens.

I had some mature Tropical Milkweed, but gave it away since they have to be kept inside here to overwinter. I may try to grow more once I locate the box with the seeds I have.

I am encouraged that I may be able to continue to do something which I so enjoyed. :O)
Thanks!

So Tiffy, how did the dig up go? I hope you'll be able to grow some Milkweed in a container on your deck. You might want to put some window boxes with annuals on your deck to help attract the butterflies. Hopefully, if they see your Milkweed it will encourage them to "leave a deposit".
Good luck with your new adventures in butterfly gardening and keep us posted.
Garnet