Cirsium japonicum

Japanese Thistle

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Hardy perennial herb with spiny lobed leaves and vibrant purple flowers. Cultivated for edible shoots or as an ornamental garden plant in temperate zones.
yard Outdoor plants wb_sunny Half-shade / Sun pets Not pet-safe
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Plant Details

Common Name Japanese Thistle
Family Asteraceae
Genus Cirsium
Species Japonicum
Variety fisch.
Origin China, Japan, Korea
Blooming Foliage plant, flowers in summer to early autumn
Leaf Color grey-green with purple veins
Sunlight Half-shade / Sun
Category Outdoor plants
Pet Friendly close No
yard

Care & Maintenance

terrain
Soil

Well-drained fertile soil, tolerates clay but requires drainage to prevent rot

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Watering

Moderate watering during active growth, drought tolerant once established, reduce in winter dormancy

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Sunlight & Care

Full sun required for robust flowering and growth, tolerate partial shade in hot climates

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Fertilization

Apply balanced slow-release fertilizer in spring before new growth begins, minimal feeding needed thereafter

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Pruning

Remove spent flower heads to prevent self-seeding and dead foliage in late autumn

Pest Control Aphid Caterpillar Leaf Miner

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 4 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
14° – 95°
Fahrenheit
Ideal ambient air temperature range for healthy growth
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Humidity
20% – 80%
% relative
Optimal relative air humidity the plant thrives in
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Light (LUX)
3000 – 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
300 – 1500
mS/cm
Electrical conductivity (nutrient concentration in soil water)

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