It carries a parasite of Monarch Butterflies referred to as Ophryocystis elektroscirrha, or OE, which can induce defects during the wings of Monarchs. As it doesn’t die back again and may bloom late, the plant itself could also confuse Monarchs by signaling a breeding year when it’s time to migrate. https://swampmilkweedannualorpere31974.onzeblog.com/30936599/is-swamp-milkweed-a-perennial-secrets