Common milkweed Asclepias syriaca is a favorite of monarchs, hardy in zones three to eight, but very aggressive, spreading by deep rhizomes and seeds. The purple-pink flowers are fragrant at night ...

Butterfly milkweed (Asclepias tuberosa) is one of the tamer milkweeds with lots of ornamental appeal. This adaptable milkweed is hardy in zones 3-10 and was named the 2017 Perennial Plant of the Year.