Mitch, a wild milkweed I transplanted (carefully) into the "Small Creatures" section of Pinebrook Children's Garden. I knew I needed milkweed if monarchs were to come to breed. The third season it was absolutely stunning...and highly fragrant in bloom, like a rich lilac type of scent.
But I felt great concern...it was growing with underground roots and was capable of invading the entire garden. Other plants include Butterfly Bush (Buddleia), Gaura, Joe Pye Weed, Red Monarda - Bee Balm, Black Eyed Susans, zinnias, hyssop, catmint, plus. I felt concern the wild milkweed would take over the area. I am still addressing that challenge. Honestly, I would not have planted it had I been aware of its invasiveness. (The same is true of the Chinese lanterns... beautiful orange seed pods but SO invasive!)
Whoever uses it needs to be aware of this capability! The Asclepsia/Butterfly Weed (orange and mauvy pink) meets the monarch needs as well and are far less invasive. The wild milkweed is great if one is able to "let it fly" and not rein it in!
I can remember back to the days where hundreds of milkweed shot up in the oats and wheat fields right before harvest. My dad had a couple of hook tools to cut them off by walking the field.
Since weed sprays you don't see those grain fields heavily infested with milkweeds anymore.
Back in the old days of World War !I we collected sacks of milkweed for kapock which was used in flight jackets for airmen.
This past year we had a couple of milkweeds and Monarchs really do appreciate them.