Kalm's St. John's Wort 'Sunny Boulevard'

Hypericum kalmianum

Family: Clusiaceae
Genus: Hypericum (hy-PER-ee-kum) (Info)
Species: kalmianum (kal-mee-AH-num) (Info)
Cultivar: Sunny Boulevard
Additional cultivar information:(PP20045, aka Deppe)
Hybridized by Wood
Registered or introduced: 2008



Foliage Color:

Unknown - Tell us

Bloom Characteristics:

Unknown - Tell us

Water Requirements:

Average Water Needs; Water regularly; do not overwater

Where to Grow:

Unknown - Tell us


24-36 in. (60-90 cm)


24-36 in. (60-90 cm)


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)

Sun Exposure:

Full Sun



Bloom Color:

Bright Yellow

Bloom Time:

Mid Summer

Late Summer/Early Fall



Other details:

Unknown - Tell us

Soil pH requirements:

6.6 to 7.5 (neutral)

7.6 to 7.8 (mildly alkaline)

Patent Information:


Propagation Methods:

By dividing the rootball

From softwood cuttings

From semi-hardwood cuttings

From hardwood cuttings

From seed; direct sow outdoors in fall

From seed; sow indoors before last frost

From seed; direct sow after last frost

Seed Collecting:

Allow pods to dry on plant; break open to collect seeds

N/A: plant does not set seed, flowers are sterile, or plants will not come true from seed

Gardeners' Notes:

No details have been posted.