Hypericum calycinum

Scientific name: Hypericum calycinum


Common names: “St. John’s wort” “Rose of Sharon”

Plant Type: Evergreen shrub, groundcover


Zone: 5-9

Light: Full sun best – deep shade = no flowers

Exposure: Exposed

Soil: Any

Moisture: Moist well drained – drought


Plant Size: H 12-18″ W 80′ spreading groundcover

Leaf and Stem shape: Small, ovate, green leaves

Flower: Golden-yellow, bowl-shaped flowers appear singly or in small clusters near the ends of branches in summer

Pruning: None required but it can be cut low in February to 1″

Maintenance: Low – zero, can be left for years if grown in the right conditions

Landscape use: Groundcover, erosion control, tree and shrub underplanting

Propagate: By cuttings, easily by division and layering, spreads aggressive underground runners

Pests & Disease: Hypericum rust is on the island

Comments: Not the invasive species of St John’s wort (Hypericum perforatum on BC invasive list), but it should be on there considering how vigorously it grows and competes, other none spreading spp. might be a better choice for your mixed flower bed, excellent choice for a contained low maintenance garden though


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