Clusters of greenish-white flowers appear from late spring through summer, in loose heads over attractive, thread-like foliage. The plants are upright and sparingly branched. Seed pods are narrow, unlike many other milkweeds, and about 3″ long. The whorled name refers to the foliage that arises from the stem in a whorl.
Full sun, dry soil. Grows well in light shade at woodland edge and in regular garden soil.
Germination: To start whorled milkweed inside, seeds need to go through a cold stratification period. Cold stratification is very important for the germination and growth of Milkweed. It helps break the seeds natural dormancy cycle. Place Milkweed seed in a damp paper towel or damp sand in a zip lock bag and place in your fridge for 3 – 6 weeks (30 days). Place in an area of the fridge, where it won’t get damaged.
Planting In Spring: Once the 30 days are complete, it’s time to plant the cold stratified seeds. Plant in 2-4” peat pots. Fill peat pots ¾ of the way with seed starting potting soil and gently add water. Water should be able to drain through the peat pots. Once the soil is damp, place 1-2 cold stratified seeds into each pot. To finish, place 1/4 inch of soil on top of the seed.
Planting In Fall: If you're planting Milkweed seed in the fall, let nature do the cold stratification for you! There is no need to place your seeds in the refrigerator before planting, you can plant seeds directly into the soil after there have been a few frosts in your area. This allows for the seeds to remain dormant for the winter and come up in the early spring. Clear away any existing growth and using your index finger to measure, create 1.5" holes for each Milkweed seed. Space seeds about 4-6” apart. Place a seed in each hole and cover. Water thoroughly.