General Plant Information (Edit)
Plant Habit: Herb/Forb
Life cycle: Perennial
Sun Requirements: Full Sun to Partial Shade
Water Preferences: Mesic
Soil pH Preferences: Slightly acid (6.1 – 6.5)
Neutral (6.6 – 7.3)
Slightly alkaline (7.4 – 7.8)
Minimum cold hardiness: Zone 3 -40 °C (-40 °F) to -37.2 °C (-35)
Maximum recommended zone: Zone 7b
Plant Height: 3-5 feet
Fruit: Other: 1.25 inch long 5-celled capsule containing numerous seeds.
Flowers: Showy
Flower Color: Yellow
Bloom Size: 1"-2"
Flower Time: Late spring or early summer
Summer
Underground structures: Rhizome
Wildlife Attractant: Bees
Butterflies
Propagation: Seeds: Self fertile
Pollinators: Bumblebees
Various insects

Common names
  • Great St. Johnswort
  • Giant St. John's-Wort
  • Great Saint John's Wort

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