If you’re familiar with the story in the bible where the loaves and fishes were multiplied to feed many people, you can do the same sort of thing with your Asclepias incarnata, Swamp milkweed.
Violets are a bit aggressive in my yard and garden and will take over a garden if allowed to do so. I was digging up some violets surrounding one of my milkweed plants and in the process I was able to divide the milkweed into twenty-three plants. I potted twenty-two and put one back in the original location. I’m not sure if they will all come back, but even if only 50% make it, it’s an easy way to increase your milkweed plant population.
Butterfly Gardening 
Fortunately people are ignoring the naysayers about ‘tropical” I’ve raised and attempted to raise many natives. TOOOO slow and right down impossible with many species. Classroom rearing of monarchs requires an available supply of tropical. Educating the next generation is our most important task. Misinformation about tropical can cause much damage. I appreciate your selling and promoting tropical milkweed for education nationwide. Natives obviously survive winters in their respective states and are best to put in the ground to get established if available. Fortunately there is a robust supply of native milkweed in all areas of the monarch range and I’ve documented it this year. A major drought from 2009-13 caused all wild creatures to decline in population although with normal rains returning populations of all wild creatuires are recovering including monarchs https://en.wikipedia.org/wiki/Droughts_in_the_United_States#2010s
Available habitat area is up over the last 20 years contrary to reports to the contrary. Study the USDA land use charts to satisfy yourself this is true. http://www.ers.usda.gov/data-products/major-land-uses/major-land-uses/#Total If you have questions and would like to discuss any of this please contact me. https://www.google.com/maps/d/u/0/viewer?mid=1pog1Dkr-1Ie6Pz_hQKud49h1i3s