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Clematis 'Jackmanii'

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Photo Courtesy of Walters Gardens, Inc.
 Common Name: Clematis
  • A large-flowered variety, 5"-6" in diameter
  • Solid deep purple flowers with prominent, creamy-yellow stamens
  • Blooms profusely from June-Oct.
  • A long-time favorite due to its vigorous growth habit and consistant flowering ability
  • Beautiful when grown through ivy up a wall or fence

A member of:
Group 3—Late flowering cultivars
These varieties bloom first on new growth beginning in midsummer, and then again on new shoots in early fall. The second round will likely produce smaller flowers than the first and flowers that were double the first time may be single the second time.

Though their growth habit makes them difficult to prune, it can be done in late winter or early spring. All shoots can be cut back to the previous year's wood, just above the base of the plant. This pruning is necessary to avoid getting a bare stem with a thick tangle above it. The spring flowers will be eliminated for that year, but the late summer flowers should still be produced. Alternatively, if you don't want to cut the entire plant back all at once, pruning can be done in stages over a period of 3 years. Each year, prune back 1/3 of the stems to 6-9 inches above a couple of well-developed buds.

Origin: Not Native to North America

Characteristics:



Height:
  8-12 Feet
Flower Color:
  Purple shades
Foliage Color:
  Green shades
Hardiness Zone:
4,5,6,7,8
Find Your Zone
Sun or Shade?:
  Full sun (> 6 hrs. direct sun)
  Part shade (4-6 hrs. direct sun)
Wet or dry?:
  Average water needs
Want to see wings?:
  Attracts hummingbirds
Need critter resistant plants?:
  Deer resistant
  Rabbit resistant
How fast should it grow?:
  Medium
When should it bloom?:
  Late spring
  Early summer
  Midsummer
  Late summer
  Early fall
How's your soil?:
  Poor Soil
  Average Soil
  Fertile Soil
Sweet or Sour Soil?:
  Neutral Soil (pH = 7.0)
  Alkaline Soil (pH > 7.0)
What's your garden style?:
  Cottage
  Eclectic

Attributes:

Border plants
Climbing
Cut flower or foliage
Specimen or focal point

Awards:

  Royal Horticultural Society's Award of Garden Merit 1993

Homeowner Growing & Maintenance Tips:

Clematis can be grown in full sun or light shade, but its base and roots must be completely shaded. You may need to plant a small shrub or large perennial directly in front of its rootball to keep it cool and shaded. A thick layer of mulch will also help to keep the soil moist. This vine prefers to be grown in moist, well-drained, slightly alkaline soil. Adding lime to the soil will help to provide these conditions.

When planting clematis, it is important to plant it 3" deeper than it was in the original pot. Bury the first set of entire leaves to encourage the production of strong shoots from below soil level and to discourage clematis wilt.


Companions:

Common/Botanical Name
Zones  
Leucanthemum superbum 'Becky'
Common Name: Shasta Daisy
5,6,7,8,9
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Phlox paniculata 'Bright Eyes'
Common Name: Phlox-Tall Garden
4,5,6,7,8
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Rudbeckia fulgida 'Goldsturm'
Common Name: Black-Eyed Susan
4,5,6,7,8,9,10
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Hibiscus 'Jazzberry Jam'
Common Name: Rose Mallow
4,5,6,7,8,9
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Veronica spicata 'Royal Candles' PP18932
Common Name: Speedwell-Spike
4,5,6,7,8
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Aster KICKIN® 'Lilac Blue'
Common Name: Aster
5,6,7,8,9
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Iris 'Victoria Falls'
Common Name: Iris-Tall Bearded
3,4,5,6,7,8,9,10
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Echinacea 'Purple Emperor' PP24459
Common Name: Coneflower
4,5,6,7,8
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Monarda didyma 'Pardon My Pink' PP24244 CPBR5100
Common Name: Bee Balm
4,5,6,7,8
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While every effort has been made to describe this plant accurately, please keep in mind that the height, bloom time, and color may differ in various climates throughout the country. The description of this plant was written based on our experience growing it in Michigan (USDA hardiness zone 5) and on numerous outside resources.