Hypericum, St. John's Wort, St. Johnswort 'Silvana'

Hypericumcerastoides

Family
Hypericaceae (hy-PER-ee-KAY-see-ee)
Genus
Hypericum (hy-PER-ee-kum)
Species
cerastoides (ser-as-TOI-deez)
Synonym
Sun Exposure
Full Sun
Height
under 6 in. (15 cm)
Spacing
6-9 in. (15-22 cm)
Hardiness
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)
Bloom Color
Bright Yellow
Bloom Time
Late Spring/Early Summer
Other Details
Category
Alpines and Rock Gardens
Groundcovers
Water Requirements
Average Water Needs; Water regularly; do not overwater
Requires consistently moist soil; do not let dry out between waterings
Foliage Color
Blue-Green
Where to Grow
Bloom Characteristics
Bloom Size
Other details
Soil pH requirements
5.6 to 6.0 (acidic)
6.1 to 6.5 (mildly acidic)
6.6 to 7.5 (neutral)
Patent Information
Propagation Methods
From seed; sow indoors before last frost
Seed Collecting
Regional

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

Christiana, Tennessee

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Gardener's Notes:

1
positive
0
neutral
0
negative
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Christiana, TN (Zone 6b) | April 2011 | positive

This is fully hardy here in z6b. (see pic at right)

Featured
Common Carder Bumblebee
(Bombus pascuorum)
Northern Cardinal
(Cardinalis cardinalis)
Featured
Common Carder Bumblebee
(Bombus pascuorum)
Northern Cardinal
(Cardinalis cardinalis)