Dense St. John's Wort Hypericum densiflorum
Other Common Name(s):
Previously known as:
- Hypericum glomeratum
- Phonetic Spelling
- hy-PER-ih-kum den-si-FLOR-um
- Description
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Bushy St. John's Wort is a native shrub of the Hypericaceae family growing up to 7 feet tall and 6 feet wide. It is native to eastern USA and west to Texas and occurs on acidic soils in moist and wet conditions, including streams, ponds, lake banks, seepage slopes, and wet meadows. In NC it can be found in the coastal, Piedmont (rarely) and mountain regions. The clusters of yellow flowers occur in summer and the leaves are 2-3 inch lance-shaped and green.
This shrub blooms on new growth and can be pruned in the early spring. Easily grown in average well-drained moist garden soil in full sun to partial shade.
Plant in groups, shrub borders, foundations or as a hedge. Works great in a native/pollinator garden or on slopes or rock gardens or rain gardens. It is very adaptable.
- See this plant in the following landscape:
- Cultivars / Varieties:
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- Tags:
- Cultivars / Varieties:
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- Tags:
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Attributes:
- Genus:
- Hypericum
- Species:
- densiflorum
- Family:
- Hypericaceae
- Life Cycle:
- Perennial
- Country Or Region Of Origin:
- Eastern U.S.A.
- Dimensions:
- Height: 2 ft. 0 in. - 7 ft. 0 in.
- Width: 3 ft. 0 in. - 6 ft. 0 in.
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Whole Plant Traits:
- Plant Type:
- Native Plant
- Perennial
- Woody Plant Leaf Characteristics:
- Deciduous
- Habit/Form:
- Dense
- Erect
- Rounded
- Growth Rate:
- Medium
- Maintenance:
- Low
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Cultural Conditions:
- Light:
- Full sun (6 or more hours of direct sunlight a day)
- Partial Shade (Direct sunlight only part of the day, 2-6 hours)
- Soil Texture:
- Clay
- Loam (Silt)
- Sand
- Shallow Rocky
- Soil pH:
- Acid (<6.0)
- Soil Drainage:
- Good Drainage
- Moist
- Occasionally Dry
- NC Region:
- Coastal
- Mountains
- Piedmont
- USDA Plant Hardiness Zone:
- 3a, 3b, 4a, 4b, 5a, 5b, 6a, 6b, 7a, 7b, 8a, 8b
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Fruit:
- Display/Harvest Time:
- Fall
- Fruit Type:
- Capsule
- Fruit Description:
- Cone-shaped seed capsules split to release seeds
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Flowers:
- Flower Color:
- Gold/Yellow
- Flower Inflorescence:
- Cyme
- Flower Value To Gardener:
- Showy
- Flower Bloom Time:
- Summer
- Flower Shape:
- Saucer
- Flower Petals:
- 4-5 petals/rays
- Flower Size:
- < 1 inch
- Flower Description:
- Flowers yellow with 5 petals and multiple stamens giving them a frilly look in dense flat-topped cymes in June to Sept.
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Leaves:
- Woody Plant Leaf Characteristics:
- Deciduous
- Leaf Color:
- Green
- Deciduous Leaf Fall Color:
- Gold/Yellow
- Leaf Shape:
- Lanceolate
- Leaf Margin:
- Entire
- Hairs Present:
- No
- Leaf Length:
- 1-3 inches
- Leaf Description:
- Dark green, lance-shaped leaves are 2-3" long
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Bark:
- Bark Color:
- Light Brown
- Bark Description:
- Smooth bronze bark
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Stem:
- Stem Is Aromatic:
- No
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Landscape:
- Landscape Location:
- Pond
- Riparian
- Slope/Bank
- Landscape Theme:
- Native Garden
- Pollinator Garden
- Rain Garden
- Design Feature:
- Border
- Foundation Planting
- Attracts:
- Bees
- Resistance To Challenges:
- Black Walnut
- Drought
- Erosion
