Hypericum Species, Giant St. John's Wort, Great St. Johnswort
Hypericumascyron

Family: Hypericaceae (hy-PER-ee-KAY-see-ee)
Genus: Hypericum (hy-PER-ee-kum)
Species: ascyron (as-SY-ron)

Category
Herbs
Perennials

Water Requirements

Sun Exposure
Full Sun

Foliage
Deciduous

Foliage Color

Height
24-36 in. (60-90 cm)
36-48 in. (90-120 cm)

Spacing
18-24 in. (45-60 cm)
24-36 in. (60-90 cm)

Hardiness
USDA Zone 2a: to -45.5 °C (-50 °F)
USDA Zone 2b: to -42.7 °C (-45 °F)
USDA Zone 3a: to -39.9 °C (-40 °F)
USDA Zone 3b: to -37.2 °C (-35 °F)
USDA Zone 4a: to -34.4 °C (-30 °F)
USDA Zone 4b: to -31.6 °C (-25 °F)
USDA Zone 5a: to -28.8 °C (-20 °F)
USDA Zone 5b: to -26.1 °C (-15 °F)
USDA Zone 6a: to -23.3 °C (-10 °F)
USDA Zone 6b: to -20.5 °C (-5 °F)

Where to Grow

Danger

Bloom Color
Bright Yellow

Bloom Characteristics

Bloom Size

Bloom Time
Mid Summer
Late Summer/Early Fall

Other details

Soil pH requirements

Patent Information

Propagation Methods

Seed Collecting
Allow seedheads to dry on plants; remove and collect seeds