Hypericum calycinum

St. Andrew's Cross

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Hardy evergreen shrub with bright yellow summer blooms and red-stemmed foliage, excellent for ground cover.
yard Outdoor plants wb_sunny Half-shade / Sun pets Not pet-safe
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Plant Details

Common Name St. Andrew's Cross
Family Hypericaceae
Genus Hypericum
Species Calycinum
Origin Southeast Europe, Turkey
Blooming Summer flowering shrub, occasionally flowers in spring
Leaf Color Green with red veins
Sunlight Half-shade / Sun
Category Outdoor plants
Pet Friendly close No
yard

Care & Maintenance

terrain
Soil

Well-drained fertile loam or sandy soil; tolerates poor soil conditions

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Watering

Moderate watering during establishment, drought tolerant once mature. Reduce in winter dormancy.

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Sunlight & Care

Full sun preferred for best flowering, tolerates partial shade in hot climates

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Fertilization

Apply balanced slow-release fertilizer in early spring before blooming season

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Pruning

Prune lightly after flowering to maintain shape and encourage bushiness

Pest Control Aphid Spider Mite Thrip

These are the insects and pathogens that commonly interact with this plant, including pests, parasites, and organisms typically associated with its care.

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Seasonal Periods

local_florist Flowering Period 3 months
Jan
Feb
Mar
Apr
May
Jun
Jul
Aug
Sep
Oct
Nov
Dec
eco Leaf Persistence 12 months
Jan
Feb
Mar
Apr
May
Jun
Jul
Aug
Sep
Oct
Nov
Dec
thermostat

Growing Parameters

thermostat
Temperature
-4° – 95°
Fahrenheit
Ideal ambient air temperature range for healthy growth
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Humidity
30% – 80%
% relative
Optimal relative air humidity the plant thrives in
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Light (LUX)
1000 – 60000
Lux
Ambient illuminance level at the plant's surface
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Light (PAR)
1000 – 2500
mmol/m²/s
Photosynthetically active radiation (PAR) intensity
water
Soil Moisture
20% – 70%
% volumetric
Water content in the growing medium
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Soil EC
400 – 1500
mS/cm
Electrical conductivity (nutrient concentration in soil water)

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