Roundseed St. Johnswort

Hypericum sphaerocarpum

Roundseed St. Johnswort

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