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HYPERICUM ascyron

Image of Hypericum ascyron

Family

Clusiaceae

Botanical Name

HYPERICUM ascyron

Plant Common Name

Siberian St. John's Wort, St. Johnswort

General Description

The tall stems of Siberian St. John's wort are topped with starry yellow flowers in summer, which later give way to large, cone-like fruits. This hardy, adaptable species occupies meadows, rocky slopes, streamsides and lightly wooded areas throughout eastern Asia, eastern Canada and the northeastern portion of the United States.

The upright, branching stems of this herbaceous perennial are clasped with opposite pairs of large, medium green, lance-shaped leaves. Highly variable in height, the plants may range in size from knee-high to as tall as a man. Sunny yellow flowers appear at the stem tops in early summer, which are attractive to bees, butterflies and other small insects. Each blossom has five narrow, somewhat reflexed petals that surround a prominent central tuft of yellow, threadlike stamens. The attractive fruits that subsequently develop are large, green, cone-shaped capsules.

Tolerant of a wide range of conditions, Siberian St. John's wort grows well in moist to average soils in full sun to partial shade. It makes a unique addition to mixed perennial gardens, and is also suitable for naturalistic meadow plantings. This wildflower is listed as a threatened species in much of the United States, and native stands should never be dug up or destroyed. Always purchase plants through a reputable native plant nursery.

Characteristics

  • AHS Heat Zone

    6 - 1

  • USDA Hardiness Zone

    2 - 7

  • Plant Type

    Perennial

  • Sun Exposure

    Full Sun, Partial Sun, Partial Shade

  • Height

    2'-6' / 0.6m - 1.8m

  • Width

    4'-6' / 1.2m - 1.8m

  • Bloom Time

    Early Summer, Summer

  • Native To

    North America, Northeastern United States, Mid-Atlantic United States, North-Central United States, Canada, Russia/Siberia, Eastern Asia, China, Japan, Korea

Growing Conditions

  • Soil pH

    Acidic, Neutral

  • Soil Drainage

    Average

  • Soil type

    Clay, Loam

  • Tolerances

    Wet Site

  • Growth Rate

    Medium

  • Water Requirements

    Average Water

  • Habit

    Upright/Erect

  • Seasonal Interest

    Summer

Ornamental Features

  • Flower Interest

    Showy

  • Flower Color

    Yellow

  • Fruit Color

    Green

  • Foliage Color (Spring)

    Green

  • Foliage Color (Summer)

    Green

  • Foliage Color (Fall)

    Green

  • Fragrant Flowers

    Yes

  • Fragrant Fruit

    No

  • Fragrant Foliage

    No

  • Bark or Stem Fragrant

    No

  • Flower Petal Number

    Single

  • Repeat Bloomer

    No

  • Showy Fruit

    Yes

  • Edible Fruit

    No

  • Showy Foliage

    No

  • Foliage Texture

    Medium

  • Foliage Sheen

    Matte

  • Evergreen

    No

  • Showy Bark

    No

Special Characteristics

  • Usage

    Bog Garden, Mixed Border, Wildflower

  • Sharp or Has Thorns

    No

  • Invasive

    No

  • Attracts

    Butterflies

  • Self-Sowing

    Yes