You can check it out beside the arbor at Charlie's Alternators. Someone has been making regular raids on specific plants at those planting beds and the idiot stole the pods when they first formed. They are worthless till they ripen and will not do so off of the bush. If you see the pods developing then just tie a piece of fine netting around it so the seeds don't escape till you collect them. Be sure they are fully ripe and either sow them in the late fall, winter germinate them, or start them indoors in the spring.
We do have seed stored for next year and will probably have plants at the spring seedling Bazaar. You have to store the seed in the refrigerator in a brown paper bag.
Collection of seeds:
http://getbusygardening.com/collect-butterfly-weed-seeds-garden/
http://www.everwilde.com/store/Asclepias-tuberosa-WildFlower-Seed.html
Propagation of seeds:
http://monarchbutterflygarden.net/milkweed-plant-seed-resources/asclepias-tuberosa-butterfly-weed/