Dividing & Transplanting: All Milkweed, and swamp milkweed in particular, develop a deep tap-root, so we do not recommend dividing or transplanting milkweed plants once they've been established in your garden or meadow.
Milkweed will naturally reseed and spread over time. You can harvest the seeds to plant them where you'd like. If you want to prevent volunteer seedlings a garden setting, remove or secure all seed pods in early fall, before they split open and spread their seeds. Learn More: Managing Asclepias Plants - How To Harvest Seeds And Control Spreading
Pests & Disease: Typically there are no serious pests or diseases that affect mature milkweed. In certain situations, aphids or whitefly can overrun your milkweed plants. Use a jet of water to hose them off. When you spray, be sure to avoid any clusters of Monarch eggs that are growing on the affected plants. Move any Monarch larvae that have already hatched to a clean place before spraying.