United States / Grow / Kalm's St. Johnswort

Kalm's St. Johnswort (Hypericum kalmianum)
Photo: (c) Joshua Mayer, some rights reserved (CC BY-SA) (CC BY-SA), via iNaturalist. Species-typical, not necessarily this cultivar.

Kalm's St. Johnswort

Hypericum kalmianum · Hypericaceae · all Hypericum records · also called Kalm St. Johnswort · Wikipedia

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Is this one for your yard?

Enter your ZIP to see whether this is legal to plant in your state, and whether it survives your winter.

Hypericum kalmianum keeps on list recommendation. Then limited evidence on Hypericum kalmianum. This is not one slogan — Hypericum kalmianum. On hypericum kalmianum, on list does not replace limited evidence.

Hypericum kalmianum also carries native and introduced range both cited.

Use evidence on Hypericum kalmianum. The jumps stay with Hypericum kalmianum. On hypericum kalmianum, on list sits with limited evidence beside Hypericum kalmianum. The table for hypericum kalmianum still names Hypericum kalmianum.

Form
shrub
Rated in
Ohio / Midwest
Uses
specimen, foundation, ground-cover
On this lot

1. Fire evidence and conditions

Fire evidence
Fire-resistant — location does not change the cited classification.
Evidence regions
Ohio / Midwest
Typed publication scope: 1 scope across 1 cited fire source
  • Firewise Landscaping (OSU Extension Bulletin 921) · Official scoped edition
    • OH; partial normalized coverage · 2006-03-01

      Ohio State University Extension Bulletin 921 is an Ohio publication that describes Ohio fire seasons and landscape conditions and labels nativity to Ohio. FireApproved publishes 352 exact source-owning plant records from its eight rated tables. This historical publication scope does not assert current extension endorsement or that a listed plant suits every Ohio site.

2. Why this plant is relevant here

State distribution
Documented in DC, IL, IN, MI, NY, OH, WI.
Native range
Current cited native range in IL, IN, MI, MN, NY, OH, WI.
Introduced / established
1 sourced range or established record. This is not an invasive warning.

3. Legal, ecological, and broader status

How to read this page

The status above is computed from the cited rows below: independent recommendations can support a fire-resistant result, an avoid row can produce keep-away, and disagreement stays visible as conflict. Placement notes preserve each source’s own scheme rather than translating unlike rules into one scale. This is evidence about a plant, not permission to plant it in every part of the defensible space; Zone 0 remains noncombustible.

Native and introduced range evidence

These are exact U.S. botanical-area records from the cited range source. Native and introduced describe biogeographic relationship, not fire performance or planting approval. Doubtful and extinct rows stay visible but do not count as current presence.

Current native

7

exact source areas

Current introduced

1

exact source area

Qualified

0

doubtful or extinct source rows

7 native source areas · World Checklist of Vascular Plants, version 16 v16, as of 2026-06-04
  • Illinois (IL)
  • Indiana (IN)
  • Michigan (MI)
  • Minnesota (MN)
  • New York (NY)
  • Ohio (OH)
  • Wisconsin (WI)
1 introduced source area · World Checklist of Vascular Plants, version 16 v16, as of 2026-06-04
  • District of Columbia (DC)

The lossless worldwide derivative is retained once in the research corpus; object pages repeat only exact U.S. areas needed by the local lens. The JSON twin carries the same page assertions.

The evidence

Grouped by what each source concluded. Primary evidence rated the plant itself (a lab, field program, or original curation); corroboration compiled or republished another source's rating and resolves to its root lineage.

Recommends (1)

Last verified 2026-08-23. JSON (CC BY 4.0)

Profiles: USDA PLANTS · GBIF · iNaturalist · Wikidata · Wikipedia · ITIS

Hypericum kalmianum (Kalm St. Johnswort). FireApproved. https://fireapproved.com/plants/hypericum-kalmianum/. Last verified 2026-08-23.