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    • Photo of Silphium asteriscus var. simpsonii by Arrowhead Alpines

    Photo by Arrowhead Alpines

    Used with permission, all rights reserved

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    Silphium asteriscus var. simpsonii

    Also Known As

    • Silphium simpsonii

    Plant type

    perennial

    size

    • H: 3'-4'
    • W: 1'-2'

    planting zones

    • 6a-9b

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    Silphium asteriscus var. simpsonii plant details

    Silphium asteriscus var. simpsonii is a broadleaf deciduous perennial with green foliage. In summer yellow flowers emerge. Grows well with sun - mostly sun and regular water. Does well in average and well-drained soil.

    CHARACTERISTICS OF Silphium asteriscus var. simpsonii

    Plant type: perennial
    Plant family: lamiaceae
    Foliage: deciduous green
    Mature size: 1 FT - 2 FT - wide, 3 FT - 4 FT - tall
    Flowers: yellow blooms in summer

    GROWING CONDITIONS for Silphium asteriscus var. simpsonii

    USDA Zones: 6a - 9b
    Sun exposure: sun - mostly sun
    Watering frequency: regular
    Soil needs: average and well-drained

    Nursery contributed plant descriptions

    A roughly 4 foot tall siphium, big leaves, big yellow daisy flowers over a long period in the summer. Zone 6. - Joseph

    By: Arrowhead Alpines

    Gardening facts about Silphium asteriscus var. simpsonii plant

    How to Grow Silphium asteriscus var. simpsonii

    • Sun Exposure

      • sun - mostly sun

    • Water Needs

      • regular

    • Soil Needs

      • average
      • well-drained

    Features

    • Foliage Color

      • green

    • Flower Color

      • yellow

    • Flower Season

      • summer

    • Foliage Season

      • deciduous

    Landscape groups by tags

    See other plant types of Silphium for your garden

    Silphium laciniatum

    aka Compass Plant

    Plant Type

    Perennial

    Zones

    4a-9b

    Size

    Height: 5'-10'

    Width: 2'-4'

    • sun
    • even moisture - regular
    Photo of Silphium laciniatum flower by Panayoti Kelaidis
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    Silphium perfoliatum

    aka Cup Plant

    Plant Type

    Perennial

    Zones

    5a-10a

    Size

    Height: 4'-10'

    Width: 2'-4'

    • sun - mostly shade
    • even moisture - regular
    Photo of Silphium perfoliatum flower by Alan Lorence
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    Silphium terebinthinaceum

    aka Prairie Dock

    Plant Type

    Perennial

    Zones

    4a-10b

    Size

    Height: 7'-10'

    Width: 3'-6'

    • sun
    • even moisture - drought tolerant
    Photo of Silphium terebinthinaceum flower by Annie's Annuals & Perennials
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    Silphium perfoliatum 'The Holy Grail'

    aka The Holy Grail Golden Cup Plant

    Plant Type

    Perennial

    Zones

    4a-9b

    Size

    Height: 6'

    Width: 3'

    • sun
    • regular
    Photo of Silphium perfoliatum 'The Holy Grail' foliage by Intrinsic Perennial Gardens
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    Silphium integrifolium

    aka Whole-Leaf Rosinweed

    Plant Type

    Perennial

    Zones

    4a-8b

    Size

    Height: 2'-5'

    Width: 24"-36"

    • sun
    • even moisture - regular
    Photo of Silphium integrifolium by Arrowhead Alpines
    View Plant

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