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    • Photo of Silphium terebinthinaceum flower by Annie's Annuals & Perennials

    Photo by Annie's Annuals & Perennials

    Used with permission, all rights reserved.

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    Silphium terebinthinaceum

    Also Known As

    • Prairie Dock

    Plant type

    perennial

    size

    • H: 7'-10'
    • W: 3'-6'

    planting zones

    • 4a-10b

    More Options

    Silphium terebinthinaceum plant details

    Silphium terebinthinaceum is a broadleaf deciduous perennial with green foliage. In fall and summer yellow flowers emerge. Attracts birds. Grows well with sun and even moisture - low water. Drought tolerant once established. Does well in rich soil. A good option if you're seeking something heat tolerant.

    CHARACTERISTICS OF Silphium terebinthinaceum

    Plant type: perennial
    Plant family: lamiaceae
    Foliage: deciduous green
    Mature size: 3 FT - 6 FT - wide, 7 FT - 10 FT - tall
    Flowers: yellow blooms in fall and summer
    Uses: cottage garden, cutting garden, floriferous, long-blooming

    GROWING CONDITIONS for Silphium terebinthinaceum

    USDA Zones: 4a - 10b
    Sun exposure: sun
    Watering frequency: even moisture - low
    Resistant to: heat
    Soil needs: rich

    Nursery contributed plant descriptions

    With leaves like elephant ears and flowers literally as high as an elephant's eye, Prairie Dock (Silphium terebinthinaceum) is a truly unique plant! Sunflower-like blooms appear on giant stalks for a month or longer. Very long-lived, individual plants can flourish for decades. Birds love the seeds! Hardy to Zones 4 - 7.

    By: Prairie Nursery

    This might just be my favorite species of silphium. The leaves of the basal rosette are massive, 18 inches long and a foot across, and incredibly cool looking. and then a leafless flower stem shoots up to as much as 10 feet. With a tap root that can reach as far as 12 feet into the soil, this thing is incredibly drought tolerant once established. Love it. Native to the eastern US. Zone 4

    By: Arrowhead Alpines

    Such a fun & magnificent perennial Sunflower. Why? Cause it’s so tall and vertical, has such large & beautiful leaves and well, Silphiums are from the mid-west & we think they’re just so exotic here in California! Growing 6’-8’ with upright leafless branching stems, “Prairie Rosinweed” displays happy-sunny 3” single blooms from late Summer thru October. Forming a basal rosette, the unusually large & beautiful leaves are up to 2’ long, sort of shaped like elephant ears & grow upright from the ground. A choice & striking “statement” perennial! And a good habitat plant too as it attracts birds & butterflies. Best show in rich moist soil, though it does tolerate drought.

    By: Annie's Annuals & Perennials

    Gardening facts about Silphium terebinthinaceum plant

    How to Grow Silphium terebinthinaceum

    • Sun Exposure

      • sun

    • Water Needs

      • even moisture - drought tolerant

    • Soil Needs

      • rich

    • Special Situation

      • heat tolerant

    Features

    • Foliage Color

      • green

    • Flower Color

      • yellow

    • Wildlife

      • birds

    • Flower Season

      • summer
      • fall

    • Foliage Season

      • deciduous

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