It carries a parasite of Monarch Butterflies named Ophryocystis elektroscirrha, or OE, that may result in defects during the wings of Monarchs. Since it doesn’t die back again and will bloom late, the plant itself might also confuse Monarchs by signaling a breeding period when it’s time to migrate. The https://exploreyourgarden.site/are-milkweeds-perennials-or-annuals/