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Hypericum densiflorum

bushy St. Johnswort add to wishlist

Plant types and subtypes: Trees & Shrubs, Shrubs, Deciduous

Light Requirements: sun, part-sun

Water Use: medium

Soil Moisture: dry, moist, wet

Soil Description: acid, rich, loam, clay, sand

Height: 2'-6'

Bloom Time: June, July, August, September

Bloom Color: yellow

Leaf Color: green

Hardiness Zone: 6, 7, 8

Additional Tags: attracts butterflies, bog plant, clumping, colonizing, fall interest, hedging plant, pond margin plant, stream margin plant, swamp plant, wetland plant

Hypericum densiflorum (bushy St. Johnswort)
  • Hypericum densiflorum (bushy St. Johnswort)
  • Hypericum densiflorum (bushy St. Johnswort)
  • Hypericum densiflorum (bushy St. Johnswort)

Pricing & Availability


Hypericum densiflorum

Also known as:

bushy St. Johnswort


dense St. John's wort


dense hypericum

Scientific Synonyms:

Hypericum glomeratum


Hypericum densiflorum is a twiggy deciduous shrub, with narrow, oblong green leaves. Mature height will vary depending on environmental conditions, from a mere 2" up to 6". It produces terminal clusters of five-petaled yellow flowers with dense brush-forming stamens. These are followed by persistent brown seed capsules. The bark is smooth and reddish-brown, peeling on older stems.


Bushy St. Johnswort is easy to grow and very adaptable. It is often found along water margins in wet environments, yet established shrubs are also drought tolerant within their native range. Full sun is best, but it will tolerate some shade where summers are hot. It spreads readily by lateral stoloniferous roots, forming dense colonies and thickets. It can be used to stabilize erosion and naturalize large areas. Can be used as a foundation plant, with the understanding that it will take over a large area. Flowering can last up to 2 months, beginning as early as June and extending as late as September, depending on geographic location. Zones: 6-8


Propagate from semi-hardwood cuttings, or from root cuttings. Can be propagated from seed, but plants are slow to develop.

Additional Notes

Hypericum densiflorum is more adaptable than Hypericum frondosum, but spreads more aggressively. It is very showy with long lasting flowers, but needs room to romp.

Native Range & Classification

Recorded County Distribution: USDA data

Native Range:

USDA Endangered Status:

  • Endangered: NY
  • Threatened: PA


Kingdom Plantae Plants
Subkingdom Tracheobionta Vascular plants
Superdivision Spermatophyta Seed plants
Division Magnoliophyta Flowering plants
Class Magnoliopsida Dicotyledons
Subclass Dilleniidae
Order Theales
Family Clusiaceae Mangosteen family
Genus Hypericum St. Johnswort
Species Hypericum densiflorum bushy St. Johnswort