Black Cohosh Actaea racemosa

☠ Toxic to humans
🐾 Toxic to pets
🌸 Blooming
🍪 Not edible
‍🌱 Easy-care
cohosh bugbane


Actaea racemosa, commonly known as black cohosh, is a plant with an elegant appearance. It bears tall, straight stems that are capped with long, fluffy spires of tiny, white flowers, which collectively resemble an elongated bottlebrush. The blossoms often have a slightly sweet smell and are known for their ability to attract pollinators such as bees and butterflies. The foliage of the black cohosh consists of large, compound leaves that are deeply lobed and often have a toothed margin. These leaves are mostly green, and the texture can be noticed from a distance, contributing greatly to the plant's lush and bushy appearance. The leaves have a matte finish and can showcase subtle hues of blue or green, depending on the light. Below ground, the plant develops a thick, knotty rhizome, which is the key to its survival and propagation. Despite the common name, the plant does not bear any actual black coloration; it stands out in a garden due to its uniquely shaped floral spikes and stately foliage.

Plant Info
Common Problems

About this plant

  • memoNames

    • Family


    • Synonyms

      Black Cohosh, Black Snakeroot, Fairy Candle, Bugbane, Rattle Root, Macrotys, Snakeroot, Bugwort.

    • Common names

      Cimicifuga racemosa, Actaea monogyna, Actaea gyrostachya, Botrophis actaeoides, Cimicifuga americana, Cimicifuga bifida, Cimicifuga cordifolia, Cimicifuga serpentaria, Macrotys actaeoides, Macrotys racemosa.

  • skullToxicity

    • To humans

      Black cohosh, common name for Actaea racemosa, contains several chemical compounds that can be toxic to humans when ingested in significant amounts. While black cohosh is used in traditional medicine and is available as a dietary supplement, improper use can result in adverse effects. The toxic components, such as glycosides and isoferulic acid, may cause symptoms like stomach pain, nausea, headache, dizziness, vomiting, visual disturbances, and weight gain. In severe cases, liver toxicity has been reported, and people with pre-existing liver conditions should be particularly cautious. It is essential that individuals use black cohosh under the guidance of a healthcare provider.

    • To pets

      Black cohosh is potentially toxic to pets if ingested. Symptoms of poisoning in pets may include vomiting, diarrhea, abdominal pain, and difficulty in breathing. Depending on the quantity ingested, more severe symptoms such as seizures or liver failure might occur. If you suspect your pet has ingested black cohosh, it's important to consult a veterinarian immediately. As with humans, the plant's glycosides and other compounds can be harmful, and pets may be more sensitive to smaller amounts of the plant material.

  • infoCharacteristics

    • Life cycle


    • Foliage type


    • Color of leaves


    • Flower color


    • Height

      4-6 feet (1.2-1.8 meters)

    • Spread

      2-3 feet (0.6-0.9 meters)

    • Plant type


    • Hardiness zones


    • Native area

      North America


  • money-bagGeneral Benefits

    • Attractive to Pollinators: Actaea racemosa, commonly known as black cohosh, supports a variety of pollinators by providing nectar.
    • Garden Aesthetics: With its tall, white flower spikes, black cohosh adds an elegant and dramatic structure to shade gardens.
    • Natural Soil Improvement: As a native plant, black cohosh can help maintain healthy soil ecosystems in its natural habitat.
    • Supports Biodiversity: By being a part of native plant communities, it supports a diverse range of other plant and animal species.
    • Erosion Control: Its robust root system can help stabilize soil and prevent erosion in shaded areas.
    • Low Maintenance: Once established, black cohosh requires minimal care and is relatively pest-free, making it an easy addition to gardens.
    • Educational Value: It can be used to educate gardeners and visitors about native plants and their role in local ecosystems.
    • Cultural Significance: Black cohosh has historical significance to Native American cultures, providing an opportunity to explore and respect traditional uses of plants.

  • medicalMedical Properties

    • Menopausal symptom relief: Actaea racemosa, commonly known as black cohosh, is often used to help reduce symptoms associated with menopause, such as hot flashes, night sweats, and mood swings.
    • Menstrual discomfort management: It has been traditionally used to help alleviate menstrual cramps and premenstrual syndrome (PMS).
    • Anti-inflammatory properties: Black cohosh may possess some anti-inflammatory properties, which could be beneficial in the treatment of arthritis and other inflammatory conditions, although evidence is limited.
    • Sedative effects: The plant has been reported to have sedative effects, which might help with sleep disturbances or anxiety.

  • windAir-purifying Qualities

    This plant is not specifically known for air purifying qualities.

  • leavesOther Uses

    • Actaea racemosa, commonly known as black cohosh, is sometimes used in landscaping for its tall white flower spikes that provide a dramatic backdrop in shade gardens.
    • The roots of black cohosh can be used as a natural dye, yielding colors ranging from yellow to deep orange when applied to fabrics.
    • Gardeners sometimes plant black cohosh near vulnerable crops to ward off pests, as its strong scent is believed to repel insects.
    • The dried seed pods of black cohosh can be utilized in floral arrangements, bringing an interesting texture and height to the display.
    • Some people use the leaves of black cohosh to create a natural insect repellent by crushing the leaves and applying the extract to the skin.
    • Black cohosh can also play a role in composting, as its leaves and stems break down and add nutrients back into the soil.
    • The plant has been traditionally used by some indigenous cultures as a ceremonial plant in various rituals and ceremonies.
    • In craft-making, the sturdy stems of black cohosh have been used to create woven goods or as part of plant-based sculptures.
    • Photographers and artists may use the striking appearance of black cohosh in their work for its aesthetic qualities and representation of natural beauty.
    • Due to its adaptability to shade, black cohosh is sometimes used in erosion control for shaded or woodland areas where other plants might not thrive.

Interesting Facts

  • bedFeng Shui

    The Black Cohosh is not used in Feng Shui practice.

  • aquariusZodiac Sign Compitability

    The Black Cohosh is not used in astrology practice.

  • spiralPlant Symbolism

    • Protection: Actaea racemosa, commonly known as Black Cohosh, is often associated with protective properties, which might stem from its traditional use by Native Americans to fend off evil spirits.
    • Feminine energy: Black Cohosh is symbolic of female empowerment and energy because it has been widely used to treat women's reproductive issues and menopause symptoms.
    • Transformation: The plant's association with female life stages makes it a symbol of transformation and change, reflecting the significant transitions in a woman's life.
    • Healing: Since Black Cohosh has a history of being used for medicinal purposes, it symbolizes healing and physical wellness.

Every 1-2 weeks
500 - 2500 Lux
Every 2-3 years
Spring to early summer
Not needed
  • water dropWater

    Actaea racemosa, commonly known as black cohosh, prefers consistently moist soil, so water the plant when the top inch of soil feels dry to the touch. Typically, this equates to watering approximately once a week, but this frequency may need to increase during hot, dry periods or decrease during cooler, wet seasons. When watering, aim for about 1 gallon of water per plant, ensuring that the water penetrates deeply into the soil to encourage deep root growth. Over-watering can lead to root rot, so it is important to allow for proper drainage and not leave the plant in standing water.

  • sunLight

    Black cohosh thrives in a spot that offers partial to full shade. The ideal lighting condition includes filtered sunlight or dappled shade, as too much direct sunlight can scorch the foliage. This makes it suitable for woodland gardens or other areas that mimic its natural, forested habitats.

  • thermometerTemperature

    Black cohosh prefers moderate temperatures and does not fare well in extremes. The plant can survive minimum temperatures down to about -20°F and maximum temperatures that do not exceed 90°F. However, the ideal temperature range for optimal growth is between 50°F and 70°F. Extreme temperatures outside these ranges can be detrimental to the health of the plant.

  • scissorsPruning

    Pruning black cohosh is not routinely necessary, but deadheading spent flowers after blooming can promote a tidy appearance and may encourage additional flowering. Cut back the dead foliage in late fall or early winter to prepare for new spring growth. Prune the plant as needed, typically no more than once a year, to remove any dead or damaged stems and to maintain its shape.

  • broomCleaning

    As needed

  • bambooSoil

    The Black Cohosh prefers a well-draining soil that is rich in organic matter with a pH of 5.5 to 6.8. A mixture of loamy soil, peat, compost, and a small amount of sand is ideal to maintain appropriate moisture and nutrient levels.

  • plantRepotting

    Black Cohosh does not require frequent repotting and can be repotted every 3 to 4 years or when it is visibly outgrown its current container. It's best to repot in the early spring or fall.

  • water dropsHumidity & Misting

    Black Cohosh thrives in moderate to high humidity conditions. Aim to maintain a humidity level above 50% for optimal growth.

  • pinSuitable locations

    • Indoor

      Place Black Cohosh in bright, indirect light and ensure high humidity.

    • Outdoor

      Plant Black Cohosh in partial shade and moist, rich soil.

    • Hardiness zone

      3-8 USDA

  • circleLife cycle

    Actaea racemosa, commonly known as black cohosh, begins its life as a seed that germinates in the spring, preferring a moist and rich soil environment within forested areas. The seedling emerges with a set of primary leaves and gradually develops a rhizome from which further foliage will grow. As a perennial, the plant then enters a vegetative stage, producing large compound leaves that form a clump and will do so for several years. After reaching maturity, which can take several years, the black cohosh plant will produce tall, white flower spikes typically in the midsummer, attracting pollinators such as bees and butterflies. Following pollination, the flowers develop into seeds by late summer or early fall, which are then dispersed, often by small mammals or gravity, completing its reproductive cycle. During winter, the above-ground parts of the plant die back, while the rhizome survives to regenerate above-ground growth the following spring.

  • sproutPropogation

    • Propogation time

      Spring to early summer

    • Black cohosh, Actaea racemosa, is commonly propagated by dividing its rhizomes or roots in the fall or early spring. The most popular method involves carefully digging up mature plants and separating the thick, knobby rhizomes into smaller sections. Each section should have at least one bud or eye to ensure successful growth. These divisions are then replanted in well-drained soil, ideally at the same depth they were growing previously. The soil should be kept moist but not waterlogged to encourage root development and plant establishment. This method allows gardeners to create new plants that are genetic clones of the parent, preserving the desired characteristics of the original plant.