GETTING MY ARE MILKWEEDS ANNUALS OR PERENNIALS TO WORK

Kinds of Butterfly Weed There are plenty of named cultivars of the plant. Most varieties, and also the native species, are orange. But some well known versions provide colour versions:I dug up alot of these last yr, bur they continue to keep appearing everywhere in my flower bed. HOW I do I get them wholly outside of my flower beds?This species is