Photo by Melody

PlantFiles: Bushy St. Johnswort
Hypericum densiflorum

Family: Clusiaceae
Genus: Hypericum (hy-PER-ee-kum) (Info)
Species: densiflorum (den-see-FLOR-um) (Info)

3 vendors have this plant for sale.


36-48 in. (90-120 cm)

36-48 in. (90-120 cm)

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)
USDA Zone 9a: to -6.6 C (20 F)
USDA Zone 9b: to -3.8 C (25 F)

Sun Exposure:
Full Sun
Sun to Partial Shade

Handling plant may cause skin irritation or allergic reaction

Bloom Color:
Bright Yellow

Bloom Time:
Late Spring/Early Summer
Mid Summer


Other details:
This plant is attractive to bees, butterflies and/or birds
Drought-tolerant; suitable for xeriscaping

Soil pH requirements:
Unknown - Tell us

Patent Information:
Unknown - Tell us

Propagation Methods:
From seed; direct sow outdoors in fall
From seed; winter sow in vented containers, coldframe or unheated greenhouse
From seed; stratify if sowing indoors

Seed Collecting:
Allow pods to dry on plant; break open to collect seeds

Click thumbnail
to view:

By gldandrews
Thumbnail #1 of Hypericum densiflorum by gldandrews

By joegee
Thumbnail #2 of Hypericum densiflorum by joegee


1 positive
No neutrals
No negatives

Gardeners' Notes:

Positive joegee On May 21, 2006, joegee from Bucyrus, OH (Zone 6a) wrote:

Bushy St. Johnswort is one of fifty-plus species of St. Johnswort found on the North American continent. According to the USDA, Bushy St. Johnswort is most commonly found down the eastern seaboard and across the gulf states, from Massachusetts south to Georgia, west to Texas. It is classified as endangered in New York state, and threatened in Pennsylvania.

It adapts well to a wide variety of soils, and is one of the first plants to begin greening -- in late January or early February the leaves begin to appear in zone 5b.

The blooms are bright yellow-colored pompom-like inflorescences up to an inch in diameter, similar to dandelion blossoms only more delicate. Bees and insects find these blooms attractive.

This bushy perennial keeps a compact, rounded three to four foot egg shape with no effort. The dark brown seed pods remain on the plant throughout the winter, and become unsightly once the plant begins to green again.

This plant contains a photoreactive (light-sensitive) chemical called hypericin. Hypericin is known to cause skin reactions in sensitive individuals. Sensitive individuals should wear gloves and long sleeves when working with this plant, and should thoroughly wash any exposed skin immediately. In grazing herbivores ingesting St. Johnswort can cause light-sensitive dermatitis with blistering (second degree sunburn), and in extreme cases death.


This plant has been said to grow in the following regions:

Red Bank, New Jersey
Ithaca, New York
Andrews, North Carolina
Franklinton, North Carolina
Bucyrus, Ohio

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