Now correctly named Actaea racemosa Black Cohosh Ranunculaceae:
Summer (mid July and August) blooming plants. Attractive clumps with tall flowering stems reaching 4 to 7 feet tall. Plants will not bloom until the third year after germination but well worth the time invested in them. They form long lived clumps that can be divided every few years. A worthwhile species for an open shade garden. For a shade margin they give some height and thus are ideal along the edge of a woodland or wooded trail and driveway. They have attractive foliage, and mix well with other large woodland species. Best in moist, well draining soils in open shade to part sun.
Native to central eastern North American.
Best to soak the seeds in warm water for 8 hours, sow and lightly cover the seeds with moist soil medium. Start seeds off with 16 weeks at 68-75F, move to 25-35F indefinitely, germination is spread out over two years. Best if moved outside during winter for the cold period. This species like many woodland species is often best sown in a prepared bed out side in the fall. A humus rich soil mixed with 25 percent sand or perlite, in an area that has morning sun but shade in the afternoon.