Hypericum kalmianum · Hypericaceae

Kalm's St. John's Wort

✅ Pet-friendlyPerennial life cycle with seasonal flowering.30 to 61 cm

LightFull sun, tolerates some shade

WaterLow

DifficultyEasy

ColdDown to -15 degrees Celsius

Full sun, tolerates some shadeLowEasyDown to -15 degrees Celsius

Description & origin

Kalm's St. John's Wort is a perennial shrub known for its vibrant yellow flowers. It is a hardy plant, ideal for low-maintenance gardens.

Size

Can reach up to 60 cm in height and 60 cm in width.

Foliage

Dark green, oval leaves that remain healthy year-round.

Flowering

Blooms in summer, producing yellow flowers that last several weeks.

Light

Prefers full sun but tolerates some shade.

Soil

Prefers well-drained soils, slightly acidic to neutral.

Watering

Requires low watering, allowing the soil to dry between waterings.

Temperature

Resistant to low temperatures, tolerates down to -15 degrees Celsius.

Fertilising

Fertilize once in spring with a balanced fertilizer.

Repotting

Transplant in spring or autumn, ensuring the soil is well prepared.

Pruning

Can be pruned after flowering to maintain shape.

Propagation

Easily propagated by cuttings in spring.

Aphid infestations

Aphids can infest the leaves, causing deformities.

Fungal diseases

May be susceptible to fungi in excessively humid conditions.

Yellowing leaves

May indicate overwatering or nutrient deficiency.

In the garden

Other uses

Used in traditional medicine for various treatments.

Did you know…

The flowers attract pollinators like bees and butterflies. It is also used in traditional medicine.