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Hypericum, Kalm's St. John's Wort, St. Johnswort 'Sunny Boulevard'

Hypericumkalmianum

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Hypericum kalmianum by Rickwebb
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Family
Hypericaceae (hy-PER-ee-KAY-see-ee)
Info
Genus
Hypericum (hy-PER-ee-kum)
Info
Species
kalmianum (kal-mee-AH-num)
Info
Synonym
Sun Exposure
Full Sun
Foliage
Herbaceous
Height
24-36 in. (60-90 cm)
Spacing
24-36 in. (60-90 cm)
Hardiness
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)
Danger
N/A
Bloom Color
Bright Yellow
Bloom Time
Mid Summer
Late Summer/Early Fall
Other Details
Category
Shrubs
Water Requirements
Average Water Needs; Water regularly; do not overwater
Foliage Color

Unknown - Tell us

Where to Grow

Unknown - Tell us

Bloom Characteristics

Unknown - Tell us

Bloom Size

Unknown - Tell us

Other details

Unknown - Tell us

Soil pH requirements
6.6 to 7.5 (neutral)
7.6 to 7.8 (mildly alkaline)
Patent Information
Patented
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
Regional

This plant is said to grow outdoors in the following regions:

Decatur, Georgia

Lisle, Illinois

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Rickwebb
Downingtown, PA | July 2016 | positive

Handsome looking shrub and good selection of a good species for landscapes. The mother species is native to around Lake Michigan, Lake Hu...Read More

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