Kalm's St. Johnswort
Hypericum kalmianum
Taxonomy
- Division:
- Magnoliophyta | - Flowering plants
- Family:
- Hypericaceae
- Genus:
- Hypericum
- Species:
- Hypericum kalmianum
Growth Characteristics
- Life Cycle:
- Perennial
- Growth Habit:
- Shrub
- Height:
- 3-4 ft
- Light Requirements:
- Full Sun
- Drought Tolerance:
- High
- Bloom Months:
- jul, aug
- Bloom Colors:
- Yellow
- Landscaping Shrub:
- Yes
Native Range
United States: District of Columbia, Illinois, Indiana, Michigan, New York, Ohio, Wisconsin, Canada: Ontario, Quebec
Keystone Species Ranking
- Caterpillar Keystone:
- ★★★☆☆ Based on number of butterfly and moth species using this genus as host plant (Source: National Wildlife Federation)
Reported Fauna Sightings
Bees: Brown-belted bumble bee (Bombus griseocollis), Brown-belted bumble bee (Bombus griseocollis), Common eastern bumble bee (Bombus impatiens), Common eastern bumble bee (Bombus impatiens), Two-spotted bumble bee (Bombus bimaculatus), Two-spotted bumble bee (Bombus bimaculatus)
Soil Requirements
- Soil Type:
- sandy, well-drained, nutrient-poor soil
- pH:
- 5.5 - 7.5 (slightly acidic to neutral)
- Drainage:
- excellent drainage required
- Moisture:
- dry to moderate
- Notes:
- Native to rocky, sandy shores and dunes
Germination Information
Pre-treatment: Cold-moist stratification for 30 days at 1–5°C (34–41°F).
Source: OpenAI GPT-4o