Roundseed St. Johnswort
Hypericum sphaerocarpum
Mason Brock (Masebrock)
Taxonomy
- Division:
- Magnoliophyta | - Flowering plants
- Family:
- Hypericaceae
- Genus:
- Hypericum
- Species:
- Hypericum sphaerocarpum
Growth Characteristics
- Life Cycle:
- Perennial
- Growth Habit:
- Forb/herb , Subshrub
- Height:
- 2-3 ft
- Light Requirements:
- Full Sun
- Drought Tolerance:
- Medium
- Bloom Months:
- jun, aug
- Bloom Colors:
- Yellow
Native Range
United States: Alabama, Arkansas, Georgia, Iowa, Illinois, Indiana, Kansas, Kentucky, Louisiana, Michigan, Missouri, Mississippi, Nebraska, Ohio, Oklahoma, Pennsylvania, Tennessee, Texas, Wisconsin, Canada: Ontario
Keystone Species Ranking
- Caterpillar Keystone:
- ★★★☆☆ Based on number of butterfly and moth species using this genus as host plant (Source: National Wildlife Federation)
Host Plant for Caterpillars
Caloptilia hypericella, parallel-banded leafroller (Choristoneura parallela), sparganothis fruitworm moth (Sparganothis sulfureana), Xenotemna pallorana
Soil Requirements
- Soil Type:
- rich, well-drained loamy soil
- pH:
- 5.5 - 7.0 (slightly acidic to neutral)
- Drainage:
- excellent drainage required
- Moisture:
- consistently moist
- Notes:
- prefers open woodlands and prairies