Eupatorium (Conoclinum) coelestinum 'Cori' Hardy Ageratum



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: Butterflies.
  • Tolerates: Deer. Coastal Conditions.
  • Other Features: Cut Flower. Fragrant. Native to North America.

Care and Growing Tips

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Shipping Info

We will ship your plants within nine days of placing the order, on either a Monday or a Tuesday. We ship early in the week to ensure that plants do not get stranded in transit over the weekend. You'll receive a tracking number when your order ships.

We appreciate your patience while our small team works to get these live plants to you safely.


    If you need your plants shipped a specific week, please make a note on the Cart page before placing the order, or reply to your order confirmation email. Thank you!

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    We ship via UPS or 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.