Tropical milkweed, Asclepias curassavica, has become a commonly grown monarch host plant in many gardens. It grows very well in our climate and survives into Fall and Winter during many years. This long life of Tropical milkweed is not necessarily a good trait for the monarch butterfly. In the Fall, monarchs are in migration mode and need to move out of our area to overwinter in warmer climates. Live host plants that are found during migration may interrupt the process. An additional problem is that Tropical milkweed may be host to a disease caused by a parasite that can impact the health of Monarch butterflies. The best tip to help our migrating Monarch butterflies, is to cut back your Tropical milkweed to the ground each Fall or better yet, grow native milkweeds that usually die back on their own.