Eryngium alpinum

Alpine Sea Holly

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A hardy alpine perennial featuring striking metallic blue thistle-like flowers atop spiny grey-green rosette foliage. Ideal for rock gardens, dry borders, and well-drained soils.
yard Outdoor plants wb_sunny Sun pets Not pet-safe
info Pot sizes shown are estimations. Real dimensions may vary depending on the merchant.
Merchant Pot Size Availability Price
Amazon.com - Out of Stock $15.00 Buy
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Plant Details

Common Name Alpine Sea Holly
Family Apiaceae
Genus Eryngium
Species Alpinum
Origin Southern Europe, Western Asia
Blooming Summer, typically July to September
Leaf Color Grey-green spiny leaves
Sunlight Sun
Category Outdoor plants
Pet Friendly close No
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Care & Maintenance

terrain
Soil

Well-drained, gritty, alkaline to neutral soil. Sandy or rocky mix preferred.

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Watering

Drought tolerant once established. Water moderately during first year to establish roots, avoid waterlogging.

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Sunlight & Care

Requires full sun for best color and compact growth; tolerates some shade but blooms may reduce.

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Fertilization

Low fertility requirement. Apply compost at planting season only.

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Pruning

Cut back dead foliage in late autumn or winter before new growth emerges.

Pest Control Aphid Slug Snail

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 2 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° – 90°
Fahrenheit
Ideal ambient air temperature range for healthy growth
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Humidity
20% – 75%
% relative
Optimal relative air humidity the plant thrives in
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Light (LUX)
10000 – 60000
Lux
Ambient illuminance level at the plant's surface
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Light (PAR)
2000 – 4500
mmol/m²/s
Photosynthetically active radiation (PAR) intensity
water
Soil Moisture
10% – 40%
% 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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