- Latin name: Asclepias cordifolia
- Quantity of seeds per packet: 25
- Monarch butterfly host plant
- Purple and pink flowers
- Native to California, Neveda, and Oregon
- Hardy perennial
- 24" - 36" tall
- Blooms from April until July
- Cold hardy in USDA zones 3 - 11
Growing Instructions: Start Heartleaf Milkweed seeds outdoors in late November. Pick a location with full sun and prepare soil for good drainage, if needed. Plant seeds 1/8" deep and 18” apart, using 3 seeds per hole. Water once, and then allow the winter rain and/or snow to provide moisture until the spring. The seeds will germinate 10 - 20 days after the danger of nighttime freezing has past. Once the seedlings reach 1", thin out so you have individual plants spaced 18” apart. Water regularly allowing the soil to go nearly dry between each watering. Fertilize monthly in the summer with a general purpose fertilizer. If you prefer to plant the seeds outdoors in the spring, read our detailed instructions on cold moist stratification.
Heartleaf Milkweed Range Map:
Map ©: Kartesz, J.T. 2013. Floristic Synthesis of North America, Version 1.0. Biota of North America Program (BONAP).
Purple Milkweed is native to the following states: California, Nevada, Oregon