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St. Johns Wort | Plant Profile

St. John’s Wort (Hypericum) are small and dense mound forming deciduous shrubs. The foliage grows upright and naturally forms a rounded shape. Bright yellow flowers grow at the ends of stalks. The foliage color can be bright green to blue-green.

St John’s Wort prefers fertile, medium moisture, well drained soils in full sun to part shade. While fertile soil is ideal, these shrubs have some tolerance to drought and poor soils once established. Pruning should be done to maintain a tidy appearance in late summer.

St John’s Wort has many garden applications. They can be used as a low border or informal hedge. Their tolerance to dry-ish soils means that they can be planted on hillsides for erosion control, or allowed to naturalize in meadows or wildflower gardens.#


St Johns Wort Characteristics

In Pennsylvania, there are two popular varieties of St. John's Wort. Both are similar in appearance with slight differences in size.

Kalm St. John's Wort (Hypericum kalmianum) are native to the American Great Lakes. Their soil tolerance can range from dry hillsides to damp lake banks and streams. They typically reach only to 3' and bloom from July to August.

Golden St. John's Wort 'Sunburst' (Hypericum frondosum) grows up to 4' and is native to the American south. This variety is used to hotter and drier climates than its counterpart and is more susceptible to root rot in poorly drained soils. Golden St. John's Wort blooms from June to July.

USDA Climate Zone
Zones 4 - 8
2.00 - 4.00'
2.00 - 4.00'
Bloom Time
June - August
Full Sun - Part Shade
Deer Resistant?