Blue Cohosh Plant

Blue Cohosh (Caulophyllum thalictroides) is a medium-tall woodland perennial in the Barberry family that is native to the hardwood deciduous forests of the eastern part of the United States. As its name implies, the Blue Cohosh plant provides deep blue berries preceded by clusters of cheerful yellow flowers among blue-green foliage. Flowers bloom from April through early summer, and the autumn foliage is bright gold.

The Blue Cohosh Plant Likes Rich Organic Soils

Like other perennials native to woodland environments, Blue Cohosh thrives in soils rich in organic content. Those who have planted Blue Cohosh under canopies of hardwood trees to replicate its natural environment should allow some of the fallen leaves to remain on the ground in autumn to decompose and contribute to the soil's organic matter. Adding layers of organic mulch or compost in spring and autumn helps keep soils rich in nutrients, and as a bonus, it will help protect the plant's roots during temperature extremes.

The Black Cohosh Plant Likes Water

Because this plant is native to areas with high seasonal rainfall, consistent moisture is one of its primary requirements. Be sure to add extra water during drought or if a heat wave dries out the soil. The Blue Cohosh plant is also a good choice to plant near water features such as ponds, creeks, and low-lying parts of the property that receive rainwater runoff.

The Blue Cohosh Plant Grows Quickly

Because the Blue Cohosh plant grows quickly and reaches a mature height of between two and four feet, it's an excellent choice for homeowners trying to establish definition and height in a new landscape. Regular fertilizing in spring and autumn will help Blue Cohosh grow more quickly and promote strong and healthy development.

The Blue Cohosh Plant is Versatile in the Home Landscape

Blue cohosh performs just as well in naturalized parts of the home landscape as at the back of the shade border or in a large container on a patio or deck. No matter where it's planted, Blue Cohosh is a long-lived plant that provides homeowners with years of unique beauty. If grown in a container, the container should have sufficient organic matter and good drainage and be placed where the plant doesn't receive the harsh midday sun. Top-dressing the soil in the container with organic mulch or compost helps these plants thrive and protects their root systems by regulating soil temperatures.

To produce berries, the Blue Cohosh plant requires another plant close by to act as a pollinator, so it's best to have at least two. Because of their height and attractive flowers, berries, and foliage, Blue Cohosh plants make an excellent hedge when planted in a straight row about one foot apart.