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)
Synonym
Sun Exposure
Full Sun
Foliage
Deciduous
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)
Bloom Color
Bright Yellow
Bloom Time
Mid Summer
Late Summer/Early Fall
Other Details
Category
Herbs
Perennials
Water Requirements
Foliage Color
Where to Grow
Bloom Characteristics
Bloom Size
Other details
Soil pH requirements
Patent Information
Propagation Methods
Seed Collecting
Allow seedheads to dry on plants; remove and collect seeds
Regional

This plant is said to grow outdoors in the following regions:

Eveleth, Minnesota

Frenchtown, New Jersey

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Gardener's Notes:

1
positive
0
neutral
0
negative
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Eveleth, MN (Zone 3a) | November 2007 | positive

I have been growing this plant in a small man-made bog since 1997. I discovered this species while doing wetland restoration; it is nativ...Read More

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