NOW shipping 2025 packets! Grow Perennial Swamp Milkweed to save the Endangered Monarch Butterfly Monarch numbers and milkweed plants are down 90% from what they were. Milkweed plants are the only source of food for the monarch caterpillar. Make a difference by planting milkweed! Also called Rose Milkweed, its pink flowers attract many pollinators. Plants grow 36-60". Direct sow in late fall or spring. Cold stratify for 30 days before seeding. Start 7-9 weeks before last frost. Transplant into 4" pots after 3-5 weeks. Harden off and transplant to well-drained soil. In the United States Swamp Milkweed (Asclepias incarnata) is native to the following states: AL, AR, CO, CT, DE, FL, GA, ID, IL, IN, IA, KS, KY, LA, ME, MD, MA, MI, MN, MO, MT, NE, NV, NH, NJ, NM, NY, NC, ND, OH, OK, PA, RI, SC, SD, TN, TX, UT, VT, VA, WV, WI, WY Asclepias plants and sap may cause skin irritation in humans and animals. Do not ingest seed or plants. Packet size: 3 ¼" x 4 ½" *Online Resale Prohibited