It carries a parasite of Monarch Butterflies termed Ophryocystis elektroscirrha, or OE, which often can lead to defects from the wings of Monarchs. Since it doesn’t die back again and can bloom late, the plant alone might also confuse Monarchs by signaling a breeding period when it’s time to migrate. https://aremilkweedplantsannualor55442.bcbloggers.com/30341213/the-best-side-of-are-milkweed-plants-annual-or-perennial