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 30-45cm tall; leaves sessile, opposite, ovate-oblong, most 6-10cm long x 2-3cm wide, leathery, regularly spaced, flat, and of similar size; flowers to 3-5cm wide, bright yellow, uaually solitary, Jul-Sep.
Habit:
Spreading
Form:
Mounded, Oval - horizontal
Texture:
Medium
Mature Height:
0.2 - 0.4m
Mature Spread:
> 25m
Growth Rate:
Fast
Origin:
Central / west Asia, 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:
Google. Compare to H. androsaemum.
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
Maintenance:
Low
Other:
can become invasive
Pest Susceptibility:
Crown rot, Wilt (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