Tony Gomez says September 6 at 11:44 am Yes Nancy, I haven’t grown it in pots before because of the taproot but have seen others do it successfully. What’s going on? If the coldest winter temperature expected in your area is -15°F (zone 5) then any plants rated zones 3-5 will Johnny’s offers several species, including famed Asclepias tuberosa, which was named 2017 Perennial Plant of the Year and is the favored food source of endangered monarch butterflies. Plants grow 3’ tall with 3’ spread. Very pleasant surprise!