Eupatorium (Conoclinum) coelestinum 'Cori' Hardy Ageratum

Available Spring 2024


The stout stems of Eupatorium (Conoclinum) coelestinum 'Cori' support large clusters of deep periwinkle blue, feathery flowers in early to mid-fall. Eupatorium 'Cori' has light green, crinkly leaves and maroon-green stems. Eupatorium coelestinum spreads aggressively via underground runners.

Also known as Hardy Ageratum, Eupatorium (Conoclinum) coelestinum is native from the eastern Great Plains to New York and Florida.

Eupatorium coelstinum 'Cori' prefers full sun and moist to wet soil. Tolerant of coastal conditions and clay soil. Hardy Ageratum is a perennial plant that will readily self sow in favorable conditions.


  • Common Names: Hardy Ageratum
  • Zones: 5-7
  • Light Requirements: Full Sun to Light Shade
  • Soil Preference: Prefers moist to wet soil
  • Height at Maturity: 24-30
  • Width at Maturity: 24-30
  • Bloom Color: Blue
  • Bloom Time: Early to midfall
  • Foliage Color: Green

Special Features

  • Attracts:
  • Tolerates: Deer.
  • Other Features: Cut Flower. Fragrant. Native to North America.

Care and Growing Tips

Check out our blog for more gardening tips!

Shipping Info


All orders placed now will ship in Spring 2024 unless requested otherwise.

    • Zones 9&10: Starting March 25th
    • Zone 8: Starting April 1st
    • Zone 7: Starting April 8th
    • Zone 6: Starting April 22nd
    • Zone 5: Starting May 6th
    • Zones 4-2: Starting May 13th

If you live in a warm climate and wish to receive your plants during the winter, please send us an email. Please note that we may be unable to fulfill your request if temperatures are too cold for safe transit or if the plants are dormant.

 plants shipped to your door

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We ship via UPS & USPS (the Post Office), and their ship rates are automatically generated through our site. We do not profit on shipping costs. We are working with these providers to get our customers the best rates possible.

All ship times are subject to change if extreme weather conditions are present here at the nursery or at the shipping destination.

Please note: Depending on the time of year, the foliage of the plants may be trimmed to fit into our shipping boxes. This could delay the flowering of the plant, but many perennials actually benefit from being cut back.

We are currently not able to ship to Puerto Rico, Hawaii, and outside of the US.