Native Tree Sale › Swamp Milkweed Image 1 of 1 Swamp Milkweed $7.00 Soil: moist-wet loam or claySize: 4-5’ Coloring: pink/purpleNative Plant pick up dates are May 11-12. Quantity: Add To Cart Added! Soil: moist-wet loam or claySize: 4-5’ Coloring: pink/purpleNative Plant pick up dates are May 11-12.