There is absolutely no damage in leaving the plant stalks in place, though this encourages rampant self-seeding, which is frequently not sought after. Never mulch above the foundation crowns, as This may promote rot. By clicking “Settle for All Cookies”, you conform to the storing of cookies with your gadget https://myeasybookmarks.com/story3872561/the-ultimate-guide-to-is-milkweed-an-annual-or-perennial