Hypericum ascryon

Common name: Great St. Johns Wort

Native plant

Hypericum ascyron (considered by many to be synonymous with Hypericum pyramidatum) is native to streambanks and moist wooded slopes from Maine to Manitoba south to Maryland, Indiana and Kansas. Great or also known as Giant St. Johns Wort has large attractive flowers and foliage. Although, the blooming period is relatively short. Giant St. John's Wort is easy to identify because of its large size and the presence of 5 styles on its flowers and seed capsules. Other large Hypericum spp. are usually woody, rather than herbaceous, and they usually have only 1-3 styles. 


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Price Level: 
Woodies- Standard Shrub
Sizing Options: 
1 Gallon


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Plant Details

Plant type


Soil type

Mesic (Not too Wet Not too Dry), Moist Mesic, Wet

Light exposure

Full Sun, Partial Sun / Part Shade

Bloom period


Urban environment

Yards that Flood


Floodplain, Moist Woods, Wetlands

Growth form

Dence Growth Form, Shrubby/Clump

Growth rate


Flower color


Fall color



Mature height
4 Feet
Mature width
2 Feet
Max height
6 Feet
Max width
3 Feet

Additional information

Butterfly host plant Pollinator hot spot

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