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Hardiness: USDA Zone 4a: to -34.4 °C (-30 °F) USDA Zone 4b: to -31.6 °C (-25 °F) USDA Zone 5a: to -28.8 °C (-20 °F) USDA Zone 5b: to -26.1 °C (-15 °F) USDA Zone 6a: to -23.3 °C (-10 °F) USDA Zone 6b: to -20.5 °C (-5 °F) USDA Zone 7a: to -17.7 °C (0 °F) USDA Zone 7b: to -14.9 °C (5 °F) USDA Zone 8a: to -12.2 °C (10 °F) USDA Zone 8b: to -9.4 °C (15 °F)
Sun Exposure: Sun to Partial Shade
Danger: N/A
Bloom Color: Bright Yellow
Bloom Time: Mid Summer
Foliage: Deciduous
Other details: May be a noxious weed or invasive Average Water Needs; Water regularly; do not overwater
Soil pH requirements: 5.1 to 5.5 (strongly acidic) 5.6 to 6.0 (acidic) 6.1 to 6.5 (mildly acidic) 6.6 to 7.5 (neutral)
Patent Information: Non-patented
Propagation Methods: From softwood cuttings From seed; direct sow outdoors in fall From seed; winter sow in vented containers, coldframe or unheated greenhouse From seed; sow indoors before last frost
Seed Collecting: Allow pods to dry on plant; break open to collect seeds
On Nov 29, 2006, Rotegard from Minneapolis, MN wrote:
Our St. John's Wort is the hardiest ground cover herb in the Lasalle community garden (Minneapolis 55403) its yellow flowers bloom most of the growing season and are good for bees. Our patch is in full//partial sun and has to be trimmed back to keep it from overwhelming neighboring Elecampene, Rue, and Melissa. It also grows wild in the prairie habitat in the Eloise Butler Wildflower garden on the west side of the city. The flowers make a useful tincture in little (50ml) vodka bottles.
On Jul 27, 2003, PurplePansies from Deal, NJ (Zone 7a) wrote:
This plant grows wild where I am, (the Mid-Atlantic). It's not a really showy plant, not suited for a perennial or flower garden. Although it may be at home in a wild, wild-flower or medicinal/herb garden. It is pretty invasive, so don't plant near shyer plants. Can grow in dryer soil but prefers moister, grows very well in even wet soil, (it often grows here on riversides and beside lakes). Grows in sun to partial sun, partial shade. Said to be useful in treating depression, but I have no idea how to prepare the plant for this use.
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