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Silphium terebinthinaceum

Prairie dock

Native to North America


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A tall, rough plant, which occurs in limestone prairies and glades. From a basal clump of huge oval to heart-shaped, dark green leaves 1 to 2' long rise smooth, almost leafless stems branching at the top  with sunflower-like flowers  up to 3" across with yellow rays and yellow center disks bloom in loose clusters on the upper parts of the plant in mid to late summer. Many of the silphiums are commonly called rosinweed because of resounous sap inside the stems.


Height:

3-10 ft

Spread:

1-3 ft

Spacing:

2-3 ft

USDA Hardiness Zone:

4 - 8

Bloom Color:

Yellow

Silphium terebinthinaceum Characteristics

Attracts Wildlife

  • Butterflies
  • Pollinators

Attributes

  • Interesting Foliage
  • East-Coast Native
  • Drought Tolerant
  • Cut Flower
  • Clay Soil
  • Naturalizing
  • Long Blooming

Flowering Months

  • September
  • August
  • July

Foliage Color

  • Green

Growth Rate

  • Slow

Season of Interest (Foliage)

  • Summer
  • Spring

Soil Moisture Preference

  • Average