Growth habit of a. syriaca in a garden
When I see asclepias syriaca growing along the roadside, it often looks like just a single stem coming up, but I'm wondering how wide it will spread in a garden (weed free) area. Will it send up several stems? I don't know how to space mine. The plants I got my seeds from were growing in a butterfly garden at a school and were about five feet tall and had very large leaves. I couldn't tell whether there were lots of plants or just a few that had spread.
This spring, the ones at the school's garden were already quite a bit taller and had bigger leaves than the wild ones coming up in the ditches although I'm pretty sure they were both syriaca. (I think)