Did you know that the environment plants grow in can actually change the dispersal characteristics of the seeds? There was a study published in 2014 that shows this for an invasive species of thistle (Teller et al 2014). It’s especially interesting when you consider that this plasticity in dispersal could play a role in its ability to invade new places successfully.
Thistles have wind dispersed seeds, and there are many other wind-dispersed plant species…including milkweeds. I would bet that they have similar adaptations to the thistles in how they regulate dispersal!