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Scientific Name:
Hypericum calycinum
Pronunciation:
hy-PEER-ih-kum ka-LEE-sin-um
Common Name:
St. John's wort
Family Name:
Hypericaceae
Plant Type:
Ground cover, Semi-evergreen
Key ID Features:
Semi-evergreen, spreading ground cover; leaves leathery, opposite, ovate and almost geometric on the stem; flowers to 3-5cm wide, bright yellow solitary in summer (not as tall as H. 'Hidcote', and H. calycinum has a conspicuous calyx).

Habit:
Spreading
Form:
Mounded, Oval - horizontal
Texture:
Medium
Mature Height:
0.2 - 0.4m
Mature Spread:
> 25m
Growth Rate:
Fast
Origin:
Europe (Bulgaria & Turkey)
Hardiness Rating:
Zone 6: (-23 to -18 °C)
Exposure:
Full sun, Part sun/part shade, Filtered shade, Deep shade
Soil/Growing Medium:
Well-drained
Water Use:
Moderate
Landscape Uses:
Erosion control, Ground cover, Group or mass planting, Rock garden, Summer interest
Additional Info:

Leaf Morphology:
Form:
Simple
Arrangement:
Opposite, Sessile
Texture/Venation:
Pinnate venation
Surfaces:
Rugose
Colour in Summer:
Green, Dark-green, paler undersides
Colour in Fall:
Green
Shapes:
Elliptic, Oblong, Ovate
Apices:
Rounded
Bases:
Obtuse
Margins:
Entire

Inflorescence Type:
Flowers solitary, Floriferous
Flower Morphology:
Flowers perfect
Number Of Petals:
5
Corolla Shape:
Rotate/stellate
Ovary Position:
Superior
Colour (petals):
Showy, Yellow
Flower Scent:
None
Flower Time at Peak:
Jul, Aug, Sep
Additional Info:
rarely in cymes of 2 or 3 florets

Fruit Type:
Capsule
Fruit Colour:
Brown
Fruiting Time:
Jul, Aug, Sep
Additional Info:
Showy,

Bark Morphology:
Smooth
Bark or Stem Colour:
Red, Brown
Organ Modifications:
Runners (or stolons)
Propagation:
Seed, Division - below ground parts
Other:
can become invasive
Pest Susceptibility:
(Pest resistant, Disease resistant, Deer resistant, Rabbit resistant, Drought tolerant)

Course(s):
  • HORT 2355
Location(s):
  • (LTW)  Langley Township Walk
  • (ONE)  Overpass North side East
  • (ONW)  Overpass North side West
  • (SGL)  Sendell Gardens, Langley
Location Map