Growing Hydrangeas in Pots: Choosing Varieties, Planting and Care
Hydrangeas grow well in pots when the variety, container and compost are chosen with their eventual size and moisture needs in mind. Learn how to plant, water, feed and protect...
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Eryngium ‘Big Blue’
Eryngo 'Big Blue'
Eryngium × olivierianum ‘Big Blue’, often called sea holly ‘Big Blue’, makes a bold statement in gravel or coastal gardens. Its upright stems reach 75cm, topped with thimble-shaped blue flowerheads edged by spiky, silvery-blue bracts in midsummer. A clump-forming perennial, it thrives in well-drained soil and sun, gaining the RHS Award of Garden Merit, valued by pollinators and excellent as a long-lasting cut flower.
Plant Details
Flowering Months
Size
- Max Height
- 0.5 m — 1.0 m
- Max Spread
- 0.1 m — 0.5 m
- Growth Habit
- Grows in tight bunches from base, forming rounded groups.
Planting Position
- Sunlight Indicates how much direct sunlight the plant needs each day. Full sun means 6+ hours, part shade is filtered or morning sun, and full shade is little to no direct sun.
- Full Sun
- Aspect Aspect refers to the direction the planting spot faces (north, south, east or west). It affects light levels, warmth and exposure.
- South East West
- Exposure Exposure describes how sheltered or exposed a plant’s position is, particularly to wind and weather.
- Exposed / Sheltered
- Hardiness Hardiness indicates how well a plant tolerates cold conditions outdoors. Higher ratings generally mean greater frost tolerance.
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(−15 to −10 °C) Cold-hardy
Ideal Soil Conditions
- Soil Type Soil type describes the texture of the soil (clay, sand, loam, chalk). This affects drainage, nutrients and how roots grow.
- Soil Moisture Soil moisture tells you how wet or dry the soil should be for best growth. Match this to your garden conditions for healthier plants.
- Free draining
- Soil pH Soil pH measures how acidic or alkaline the soil is. It affects nutrient availability and can impact plant growth.
Plant Uses & Merits
- Uses
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- Architectural
- Patios / Courtyards
- Coastal Areas
- Containers
- Banks / Slopes
- Flower Borders
- Merits
-
- Drought Resistant
- RHS | Award Of Garden Merit
- Good for Cut Flowers
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