// SPECIES PROFILE · PERENNIAL · NATIVE

Great st. john's-wort

Hypericum ascyron

Great st. john's-wort (Hypericum ascyron) is a perennial in the — family. Native range includes KS, MO. Hardy in zones 2b–8a. Blooms Jun–Aug.

// QUICK FACTS

Family: —
Group: perennial
Native range: Native to 21 U.S. states, including CT, DE, IA, IL, IN, KS…
USDA hardiness: Zones 2b–8a
Mature size: —
Sun: Part shade
Water: Medium
Bloom: Jun–Aug
Wildlife value: Pollinator and wildlife support
Ecological role: native species profile

Great st. john's-wort (Hypericum ascyron) — *Hypericum ascyron* — Great st. john's-wort. Photo by Qwert1234 via Wikimedia Commons (CC BY-SA 3.0).

Field Notes

[ growing · ecology · siting · care ]

Great st. john's-wort (Hypericum ascyron) is a perennial in the — family. Native range includes KS, MO. Hardy in zones 2b–8a. Blooms Jun–Aug.

Why it's on this list: native species profile. Native-range data from the Lady Bird Johnson Wildflower Center (NPIN), cross-checked against iNaturalist observations. Part of Rooted Revival's regional native plant catalog — true natives for Oklahoma, Arkansas, Missouri and Kansas.

Companion Planting

[ guild · polyculture · cross-layer pairings ]

In the same native range, great st. john's-wort pairs naturally with: Broadleaf Arrowhead (Sagittaria latifolia), Butterfly Milkweed (Asclepias tuberosa), Cardinal Flower (Lobelia cardinalis), Common Blue Violet (Viola sororia).