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Great St. John's Wort

Hypericum ascyron

Great St. John's Wort adds a burst of cheerful yellow to the garden with its large, sunny flowers that bloom in mid-summer. This robust perennial can reach up to 5 feet in height, offering a bold vertical element to the landscape. The flowers, up to 3 inches across, feature a profusion of stamens that create a frilly, eye-catching center. It's a wonderful choice for attracting pollinators like bees and butterflies and fits well in naturalistic settings or as a background plant in perennial borders. Thriving in full sun to partial shade, it adapts to a range of soil conditions but prefers moist, well-drained sites.

Details

Height24” - 60”
Spread18"
Bloom SeasonJune – August
Soil Types
clayClay
loamLoam
sandSand
Soil Moisture
moistMoist
wetWet
Sun Exposure
fullShadeFull Shade
partSunPart Sun
fullSunFull Sun

Range Map

Available
Not available

Ecological Benefits

Maintenance Tips

  • Deadhead to promote continued blooming and prevent self-seeding.
  • Minimal care needed in general; monitor for rust and leaf spots and treat as necessary.

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