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Collection of perennials for coastal borders

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Collection contains 4 plants

  • 1 x Armeria maritima Alba - Sea Thrift
  • 1 x Eryngium maritimum
  • 1 x Lavatera maritima - Tree Mallow
  • 1 x Crambe maritima - Sea Kale

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More information

A collection that brings together 4 perennial plants perfectly adapted to coastal conditions: sandy soil, wind, sea spray and less poor and dry soil. The Spanish daisy with white flowers is a small border or rockery plant, the sea thistle with prickly leaves and blue flowers is planted in the second row of the flowerbed, just like the sea kale with large, wavy, evergreen blue leaves. The Lavatera is a tall, floriferous shrubby perennial to plant at the back of the flowerbeds. Plant them in the sun, in rockeries or in gravel flowerbeds, in very well-drained soil.
Exposure
Sun
Hardiness
Hardy down to -6°C
Soil type
Chalky (poor, alkaline and well-drained), Stony (poor and well-drained)
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Best planting time March to April
Recommended planting time March to June
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Flowering time May to October
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Collection items (4 plants)

Description

A collection that brings together 4 perennial plants ideal for a seaside garden: Armeria maritima 'Alba', Eryngium maritimum, Lavatera maritima, and Crambe maritima. Planted in the sun, in well-drained sandy soil or in a large rockery, they will provide a very colourful decoration from May to October and their foliage persists in winter.

The collection consists of:

- x 1 Sea Thrift or Sea Pink 'Alba': a small plant forming a cushion of fine green leaves even in winter, topped with small umbels of white flowers from May to July. This perennial does not exceed 20 cm high, but it spreads on the ground. Perfect for bordering flower beds or rockeries.

- x 1 Sea Holly: a botanical species from coastal areas, forming an upright, 60 cm high tuft, with persistent, bluish-green, cut, tough, and very spiny foliage. From June to September, this thistle produces round, remarkable metallic blue flower heads.

- x 1 Sea Lavatera or Spanish Mallow: a fast-growing but short-lived woody perennial with an upright, bushy habit reaching 1.50 m high and 1 m wide. It has persistent, velvety, beautiful ash-green foliage and 4 cm cup-shaped, bicoloured flowers in white, washed with lilac pink, with a magenta centre from June to October.

- x 1 Sea Kale: a cousin of our vegetable kale that is cultivated as much for its edible young shoots as for its beauty. This plant reaches 60 cm high when flowering and 50 cm wide. It forms a tuft of superb curly, bluish-green leaves with white, cloudy, fragrant flowers between May and July.

Each of these perennial plants appreciates the sun and the conditions of the seaside. With a lesser or greater degree of resistant to frost and drought, they will thrive particularly well in sandy, rather poor soils that do not retain too much moisture in winter. Limestone is well tolerated. They can compose the basic structure of a rockery: place the Sea Thrift, Sea Holly, and Sea Kale in the front, and the Sea Lavatera in the background. To allow these three plants to fully flourish, keep a distance of 60 to 80 cm between each one. Ideally, plant them between large stones. The Sea Lavatera is the least frost-resistant (to -7 °C at its peak) and it does not live more than 5 years, but it can be easily propagated by cuttings and seeds.

Grow these coastal perennials with other species that appreciate the same environments: rockroses, lavenders, Corsican spurge, Globularia trichosantha, or Senecio mandraliscae. You can create very decorative scenes in rocky flower beds and gravel beds.

 



Flowering

Flower colour multicoloured
Flowering time May to October

Foliage

Foliage persistence Evergreen
Foliage colour green

Plant habit

Height at maturity 20 cm
Spread at maturity 30 cm
Growth rate slow

Botanical data

Other common names

Spanish daisy, sea thistle, sea kale, lavatera

Origin

Cultivar or hybrid

Product reference21072

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Planting and care

Plant these coastal perennial plants in very well-drained, even poor and sandy soil which is moist to dry in summer, slightly chalky, neutral, or slightly acidic. They require sunlight. They are resistant to wind and sea spray and their main enemy is excess moisture. In clay soils, incorporate plenty of coarse sand and gravel to improve drainage before planting. Remove faded flowers. Prune the lavatera quite short in early spring.

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Planting period

Best planting time March to April
Recommended planting time March to June

Intended location

Suitable for Rockery
Type of use Edge of border, Slope
Hardiness Hardy down to -6°C (USDA zone 9a) Show map
Ease of cultivation Beginner
Planting density 2 per m2
Exposure Sun
Soil pH Neutral
Soil type Chalky (poor, alkaline and well-drained), Stony (poor and well-drained)
Soil moisture Dry soil, Moist soil, Very well-drained, sandy or gravelly.

Care

Pruning instructions Cut the faded flowers. Prune the lavatera in early spring.
Pruning Pruning recommended once a year
Pruning time June to September
Disease resistance Good
Overwinter Can be left in the ground

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