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§1 Plant

Hypericum ascyron L.

vernacular great St. Johnswort — species · Clusiaceae

USDA
HYAS80
GBIF
3189479
Rank
species
great St. Johnswort (Hypericum ascyron)
Platephotograph · Junichi HASHIMOTOCC BY-ND source · iNaturalist ↗

§2Habit & range

Habit and range

Growth habit
Forb/herb
Duration
Perennial
Group
Dicot
Family
Clusiaceae Lindl.
Genus
Hypericum
§2a

Native status, by region

  • CAN Canada Native
  • L48 Lower 48 States Native
§2b

County-level range

· 284 counties across 19 states/territories
Legend Native · 284 Introduced · 0 Both · 0 Hover a county for detail.

§3Cultivation specs · USDA

Recorded by the USDA Plant Materials Program.

§3a

Tolerances

Drought
Low
Shade
High
Moisture use
Medium
Fire
High
Salinity
None
Anaerobic
Medium
CaCO₃
Low
Hedging
None
§3b

Climate & soil

Cold tolerance
-23 °F minimum
Frost-free days
80 min.
Precipitation
32–55 in/yr
pH range
5.7–7.1
Root depth
14 in min.
Fertility need
Medium
Soil texture
medium, fine
§3c

Form & growth

Growth form
Single Crown
Growth rate
Moderate
Lifespan
Long
Mature height
5 ft
Foliage texture
Coarse
Foliage colour
Green
Porosity (summer)
Moderate
Porosity (winter)
Porous
Flower colour
Yellow
Fruit colour
Brown
Fire resistant
No
N fixation
None
Toxicity
None
§3d

Reproduction

Bloom period
Late Summer
Seed abundance
Medium
Seed begins
Summer
Seed ends
Fall
Spread rate
Slow
Stratify
Yes
Seeds / lb
1,800,000
Propagation
container, sprigs
§3e

Use & availability

Commercial availability
No Known Source
Nursery stock
Yes
Browse palatability
Low
Graze palatability
Low
Palatable, human
No
Protein potential
Low
Lumber
No
Christmas tree
No

§4Counties, by state

Recorded in 284 counties across 19 states/territories.

Illinois view state ↗ 26 N ▾
Indiana view state ↗ 13 N ▾
Iowa view state ↗ 4 N ▾
Kansas view state ↗ 2 N ▾
Maine view state ↗ 1 N ▾
Maryland view state ↗ 1 N ▾
Massachusetts view state ↗ 4 N ▾
Michigan view state ↗ 35 N ▾
Minnesota view state ↗ 30 N ▾
Missouri view state ↗ 6 N ▾
Nebraska view state ↗ 4 N ▾
New Hampshire view state ↗ 3 N ▾
New Jersey view state ↗ 6 N ▾
New York view state ↗ 22 N ▾
Ohio view state ↗ 29 N ▾
Pennsylvania view state ↗ 25 N ▾
Vermont view state ↗ 9 N ▾
West Virginia view state ↗ 2 N ▾
Wisconsin view state ↗ 62 N ▾

§5Sources & provenance

USDA PLANTS

Symbol, taxonomy, distribution, cultivation specs, native status. Public domain.

plants.usda.gov/HYAS80 ↗

GBIF Backbone

Canonical taxonomic identity, synonym resolution, cross-refs. CC0.

gbif.org/species/3189479 ↗

Record version

Cached and built locally. Source version on this record:

usda-plants-mt-2026-05-26

fetched 2026-05-26T13:12:28Z