Skip to product information
1 of 4
Caulophyllum thalictroides (blue cohosh) flowers
Caulophyllum thalictroides (blue cohosh) berries
Caulophyllum thalictroides (blue cohosh) foliage

blue cohosh

Caulophyllum thalictroides

Regular price
$8.99
Regular price
Sale price
$8.99
Shipping calculated at checkout.

FALL 2025. Sign up for the waitlist to be notified when available for purchase.

PLEASE KNOW: Plants shipped in early spring are likely to arrive dormant.

An eastern and central US native shade plant that is easy to overlook until the bight blue seed pods appear in late summer. They cling to the plant in fall even as foliage declines, lending interest to the garden. 

Easy to grow in the woodland garden with rich, moist but well-drained soil. 

Note: these plants take a long time to bloom. We do not expect to see flowers for another two to three years. 

Zones: 3 to 8
Family: Asteraceae
Type: Perennial
Height: 12 to 36 in.
Spread: 6 to 12 in.
Exposure: part sun to full shade
Soil: moist, well-drained soil 
Bloom Time: April
Native Range: eastern and central North America

image credits

Eric HuntCC BY-SA 4.0, via Wikimedia Commons
Joshua Mayer from Madison, WI, USACC BY-SA 2.0, via Wikimedia Commons
Laval University CC BY-SA 4.0, via Wikimedia Commons

Caulophyllum thalictroides (blue cohosh) flowers
Caulophyllum thalictroides (blue cohosh) berries
Caulophyllum thalictroides (blue cohosh) foliage

Ordering information

Preorders

You may place your order anytime to reserve plants for spring 2025 shipment. If you place multiple orders, we will combine plants into one box (or as many as needed) and any extra shipping charges will be refunded when we ship.

We will begin shipping plants as soon as plants begin to emerge from dormancy in spring. Woodies will likely begin shipping in April. Perennials will likely begin shipping in May. If ordering multiple varieties, we will hold until all plants are ready to ship together. If you would like to receive plants sooner please reach out.

We will check in with you a week before shipping to make sure you receive your plants at a time that is convenient for you.

Shipping

Live plants ship in spring and fall only. Plants may ship dormant, depending on variety and season. Shipping costs are most reasonable when bundling like size plants.

  • 4-inch: 1-6 plants ship for $15.00 / 7-13 plants ship for $18.00 / 14-30 plants ship for $40.00
  • 1-gal: 1-2 plants ship for $18.00 / 3-4 plants ship for $25.00 / 5-6 plants ship for $40.00
  • trees & shrubs: $27.00-$40.00 each, height dependent
  • seeds: $6.75 or free with orders over $15.00

We regret that we cannot ship internationally or to the following states: AK, AZ, CA, CO, FL, HI, ID, MT, NV, OR, UT, or WA.

Read more about our shipping policies here.

Nursery pick up

Plants can be collected from the nursery Monday through Sunday from 10am-4pm in Spring, Summer, and Fall. We prefer 24 hour notice to get your order together and will email you when ready for collection.

If you place a SPRING 2025 PREORDER, we will contact you in spring when your plants are ready for collection. Woodies will likely become available for collection in April. Perennials will likely become available in May. If ordering multiple varieties, we will hold until all plants are ready to be collected together.

Plant Sizes

We most commonly use the following pot sizes for perennials:

  • 4-inch pot: 3.5" H x 3.5" W x 3.5" D
  • 2-quart pot: 6" H x 5.25" W x 5.25" D
  • 1-gallon pot: 6.87" H x 8" Dia (this is a true one gallon pot, not the smaller 'trade' one gallon pot used by many nurseries)

Check out our illustrated pot size guide here.

Representative trees & shrubs are photographed in their pots and posted on each plant page.

Sustainability

Sustainability is at the heart of what we do at The Old Dairy. We grow all of our plants outdoors without the use of chemicals, fertilizers, carbon fuels, or peat.

Many of our perennials are grown in the ground and dug upon order (this is especially true for larger sizes). This practice allows us to grow stronger, healthier plants using native soil, and ultimately reduces our impact on the environment.

Our open-pollinated seeds are collected from plants in our mother beds, which have never been treated with chemicals or sprays of any kind.

Read all about our sustainable practices here.

garden location coming soongarden location coming soon
garden location coming soongarden location coming soon

view this plant in our garden

Caulophyllum thalictroides |

seedling image

Caulophyllum thalictroides

We are slowly creating a seedling image library to help make weeding easier.
garden location coming soongarden location coming soon
garden location coming soongarden location coming soon