Milkweed - Monarch Butterfly

A: Hi. I believe the species is Asclepias Tuberosa. Perennial Zone 3a-9b. Spacing 15-18 inches apart. Height 2-3 feet. Sow direct in fall for spring. Needs cold before planting (I use the refrigerator for 2 weeks then scatter in flats I know, unconventional but it works for me) Doesn't become invasive. Native to most of US and Western Canada. Orange/red flowers. Better as a nectar plant, caterpillars don't seem to like the thin leaves, which don't have milky sap like other species. I plant other types of milkweed with it along with Parsley and Dill for the swallowtail butterfly. It is said that Aphids love it though I haven't had problems with them on it, but this year I will plant sunflowers for the ants to herd the aphids up them and away from the milkweed. Also Nasturtium for aphid trap crop. This trick works for peas and other aphid loving plants.