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Hellebore, Onyx Odyssey

Buy Any 3 Perennial Plants or Bulbs & Save 20%

Short Description

This intriguing color is unusual among spring bloomers.

Full Description

The full double blooms are intensely purplish-black. Matched with burgundy-rose Kingston Cardinal and pink spotted Phoebe, the trio of double-flowered hellebores will make a stunning show. Glossy foliage, deep green to purplish-black emerge in spring, and keep very attractive through the seasons. Hellebores make excellent ground covers and are deer resistant.
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Item#: 20231
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Hellebore, Onyx Odyssey
Hellebore, Onyx Odyssey , , large
Item #: 20231
1 plant
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Product properties

Zone This refers to the USDA hardiness zone assigned to each part of the country, based on the minimum winter temperature that a region typically experiences. Hardiness zone ranges are provided for all perennial plants and you should always choose plants that fall within your range.


Sun The amount of sunlight this product needs daily in order to perform well in the garden. Full sun means 6 hours of direct sun per day; partial sun means 2-4 hours of direct sun per day; shade means little or no direct sun.

Full Shade, Part Sun

Height The typical height of this product at maturity.

18-24 inches

Spread The width of the plant at maturity.

18-24 inches

Bloom Season The time of the year when this product normally blooms.

Spring, Winter

Resistant To Adverse garden conditions, such as heat or frost, deer or rabbits, that this product can tolerate well.

Cold, Deer, Pests, Rabbit

Plant Shipping Information

Plants begin shipping on:

Sep 12, 2016

(Click here for fall shipping schedule)


Item 20231 cannot ship to: AA, AE, AK, AP, AS, CN, FM, GU, HI, MH, MP, PR, PW, VI
See all Burpee plant shipping restrictions for your state

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Introduction to Perennials
Perennials return year after year blooming on their own. Watch this introduction and discover how easy and rewarding growing perennials can be.
Watch video
Perennials Tour #2
Take a garden tour and see favorite perennial plants in a garden setting. In this video- Rudbeckia (Black Eyed Susan), Perennial Garden Phlox, Hibiscus and Silphium.
Watch video

Hellebores: Potted Plant Perennial

How to Plant

Planting Potted Plants in the Garden:

  • Select a location in full to part shade with good rich moist organic soil. Choose a location where plants will not be as exposed to winter damage.
  • Prepare the bed by turning the soil under to a depth of 6-12, inches removing any debris, and lightly raking as level as possible.
  • The addition of organic matter (leaf mold, compost, well-rotted manure) benefits all gardens and is essential in recently constructed neighborhoods.
  • Plant on a cloudy day or in late afternoon to reduce transplant shock.
  • Dig a hole for each plant large enough to amply accommodate the root ball.
  • Unpot the plant and gently loosen the root ball with your hands to encourage good root growth.
  • Place the top of the root ball even with the level of the surrounding soil. Fill with soil to the top of the root ball. Press soil down firmly with your hand.
  • Use the plant tag as a location marker.
  • Thoroughly water and apply a light mulch layer on top of the soil (1-2 inches) to conserve water and reduce weeds.

How to Grow

  • Keep weeds under control during the growing season. Weeds compete with plants for water, space and nutrients, so control them by either cultivating often or use a mulch to prevent their germination.
  • In the spring, use a top-dressing of compost.
  • Careful watering is essential in getting perennials off to a good start. Water thoroughly at least once a week to help new roots grow down deeply. Soil should be damp at about 1 inch below the soil surface. You can check this by sticking your finger in the soil. Water early in the morning to give all leaves enough time to dry.  One inch of rain or watering per week is recommended for most perennial plants. You can check to see if you need to add water by using a rain gauge.
  • Good air movement is also important.
  • After new growth appears, a light fertilizer may be applied. Keep granular fertilizers away from the plant crown and foliage to avoid burn injury. Use low rates of a slow release fertilizer such as Garden-tone, as higher rates may encourage root rots.
  • Cutback old foliage after blooming.
  • Do not mulch in the fall for winter protection. This can smother that plant.
  • Hellebores seldom need dividing and often self sow. Avoid disturbing plants once they are established.

Growing Tips

  • Hellebores are evergreen and bloom very early in the season.
  • Hellebores make interesting, long lasting cut flowers.
  • Note that hellebores are toxic if eaten to humans and animals.
Full Shade, Part Sun
18-24 inches
18-24 inches
Bloom Season
Spring, Winter
Resistant To
Cold, Deer, Pests, Rabbit
Ornamental Use
Beds, Borders, Complete Container, Container, Cut Flowers, Filler
Planting Time
Fall, Spring
Life Cycle
Hellebore, Onyx Odyssey is rated 3.0 out of 5 by 3.
Rated 3 out of 5 by from first season I received this six months ago, planted it next to one that is 3 years old. It is still alive, hopefully next spring it will blossom. The one I already had was in bloom when I purchased it. I don't know how old it was.
Date published: 2016-09-15
Rated 1 out of 5 by from Hellebores The first year I purchased it the greenery struggled. earlier this year one flower bloomed but its head hung down it never opened and the blooms are much smaller than pictured.
Date published: 2016-09-11
Rated 5 out of 5 by from Love this plant! Awesome plant. Beautiful blooms. Hoping next year to have more blooms
Date published: 2016-03-11
  • 2016-10-20T06:18CST
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