great st. john's wort
Hypericum ascyron
USDA zones4 to 8
SunHandles full sun to full shade
WaterHandles moderate to wet soil
Size2 to 5 feet tall1 to 3 feet wide
- Habit
- Herb
- Bloom season
- Summer
- Bloom color
- Yellow
- Foliage color
- Green
- Soil types
- Sand, loam, clay, chalk
- Soil pH
- Acid, alkaline, neutral
Garden uses
Notes
Great St. John's wort (Hypericum ascyron) is a perennial for borders, rain gardens, and naturalized areas. It is hardy to USDA zone 4, or down to -30°F (-34°C). This plant likes full sun to full shade and average to wet soil of most types. It stands 2 to 5 feet tall and carries 2 inch yellow flowers with bushy stamens in early to late summer. Deer and rabbits tend to pass it by. The large green leaves add bold texture to the bed.
Pairs well with Swamp milkweed, Cup plant, and Culver’s root.
Native range
CT, DE, IA, IL, and 18 more places. See all 22
CT, DE, IA, IL, IN, KS, MA, MD, ME, MI, MN, MO, NE, NH, NJ, NY, OH, PA, VT, WI, WV; ON, and QC.