Silphium perfoliatum (Cup Plant)
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Silphium perfoliatum

Cup Plant

Yellow flowers that attract bees and parasitic wasps on branches up to 10'. Pairs of coarse-toothed leaves meet at and surround the square stem, forming a cup or reservoir that holds water, attracting birds and insects. Prefers moist to wet soils.

Height: 6-8 ft
Width: 24-36 in
Soil Conditions: Moist/Well Drained
Flower Color: Yellow
Bloom Time: July,August,September
Hardiness Zone: 3 TO 7
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Characteristics & Attributes for Silphium perfoliatum

Attributes

Fall Color

Attracts Wildlife

Attracts Butterflies
Attracts Wildlife

Plant Habit

Upright

Light Conditions

Sun

Native Plant Community

Mesic Prairie

Bloom Time

July
August
September

Flower Color

Yellow

Flower Hue

Light

Flower Height

6' to 8'

Flower Type

Head

Foliage Color

Green

Leaf Texture

Coarse

Prune Time

Jan/Feb/March

Flower Form

Single

Growth Rate

Fast