Details of...
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 3-5 cm wide, bright yellow solitary in summer (not as tall as H. 'Hidcote' and H. calycinum has a conspicuous calyx).
Course(s): HORT 2355

Habit: Spreading
Form: Mounded, Oval - horizontal
Texture: Medium
Mature Size:
Height:0.2 - 0.4m
Spread:> 25m
Growth Rate:Fast
Origin: Europe (Bulgaria & Turkey)
Hardiness Rating: Zone 6: (-23 to -18 C)
Exposure: Deep shade, Filtered shade, Full sun, Part sun/part 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
St. John's wort
Leaf Morphology: Glossary
Form: Simple
Arrangement: Opposite, Sessile
Texture/ Venation: Pinnate venation
Surfaces: Rugose
Colour in Summer: Green, Dark-green, paler undersides
Colour in Fall: Green
Leaf(let) Terms:
Shapes: Elliptic, Oblong, Ovate
Apices: Rounded
Bases: Obtuse
Margins: Entire

Inflorescence Type: Floriferous, Flowers solitary
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
Plant Care:
Other:can become invasive
Pest Susceptibility: Pest resistant, Disease resistant, Deer resistant, Rabbit resistant, Drought resistant
(LTW) Langley Township Walk
(ONE) Overpass North side East
(ONW) Overpass North side West
(SGL) Sendell Gardens, Langley
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