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Silphium trifoliatum

Silphium trifoliatum

Whorled Rosin-Weed

  • Pricing

    Seed Cost Per Oz. $29

    Seed Cost Per Lbs $450

    Cost Per Plant Plug $1.95

  • Plant Height

    4-5'

  • Plant Spread

    2-3'

  • Flower Color

    Yellow

  • Bloom Period

    Jul-Aug

  • Companion Plantings

    Companion Plantings: Eryngium yuccifolium
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