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PlantFiles: Great St. Johnswort, Giant St. John's-Wort
Hypericum ascyron

 
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Family: Clusiaceae
Genus: Hypericum (hy-PER-ee-kum) (Info)
Species: ascyron (as-SY-ron) (Info)

Synonym:Hypericum pyramidatum

3 vendors have this plant for sale.

4 members have or want this plant for trade.

Category:
Herbs
Perennials

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)

Sun Exposure:
Full Sun

Danger:
Unknown - Tell us

Bloom Color:
Bright Yellow

Bloom Time:
Mid Summer
Late Summer/Early Fall

Foliage:
Deciduous

Other details:
Unknown - Tell us

Soil pH requirements:
Unknown - Tell us

Patent Information:
Unknown - Tell us

Propagation Methods:
Unknown - Tell us

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

Profile:

1 positive
No neutrals
No negatives

Gardeners' Notes:

RatingAuthorComment
Positive wetdogfarm On Nov 3, 2007, wetdogfarm from Eveleth, MN (Zone 3a) wrote:

I have been growing this plant in a small man-made bog since 1997. I discovered this species while doing wetland restoration; it is native to NE US and adjacent Canada. I am not sure how it performs in a regular garden bed, but it can tolerate flooding, wet winters, and it will flower even with only morning light. It is not invasive by seed, and it forms a tidy upright clump, only 6" at the base, about 5 feet tall. I have never staked it, although I have had individual out stems fall over at the base in high wind.

Regional...

This plant has been said to grow in the following regions:

Eveleth, Minnesota



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