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Clasping coneflower Seeds - Rudbeckia amplexicaulis

Rudbeckia amplexicaulis
Clasping Coneflower

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More information

Medium-sized (45/60 cm) ephemeral perennial plant grown as an annual or biennial, with original, yellow and black sombrero-like blooms that are constantly renewed from July to September. Rudbeckia amplexicaulis is used as a bedding plant in sunny situations as well as for the creation of summer bouquets.
Flower size
7 cm
Height at maturity
60 cm
Exposure
Sun
Annual / Perennial
Perennial
Germination time (days)
120 days
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Sowing period March to April
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Flowering time July to September
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Description

Rudbeckia amplexicaulis, sometimes called Dracopis amplexicaulis or Clasping Coneflower, is an ephemeral perennial that is cultivated as an annual or biennial. It is easy to grow and will not last more than 2 to 3 years because it is vulnerable to frost, especially in humid conditions.

Rudbeckia amplexicaulis is a medium-sized plant (45/60 cm) recognizable by its unique sombrero-shaped flowers.

The foliage consists of a mound of blue-green, toothed, lanceolate, 5 to 10 cm long basal leaves, from which sturdy, branched flower stems grow. The stems bear narrower, rather oval-shaped cauline leaves.

The flowers of Rudbeckia amplexicaulis are large solitary daisies (pseudanthia) with a prominent black centre and yellow drooping corolla. The long petals are regularly arranged around the centre of the flower which reaches a diameter varying from 5 to 7 cm. The large number of flowers which renew themselves continuously from July to September, form a remarkable blooming mass among other perennials and annuals. This flowerbed is a source of fresh flowers for making bouquets.

At the end of summer, the yellow and orange petals fade and fall, while the cone-shaped centre of the flowers dries and mummifies. Here again the flowers can be picked and incorporated into a dried flower bouquet.

Clasping Coneflower likes warm and sunny situations. In terms of soil, it prefers a rich, moist and most importantly, well-drained soil.

Ecological benefit : All summer long, the melliferous flowers of the Rudbeckias attract pollinating insects and butterflies to your garden. This is a good way to improve the ecosystem of your garden and to promote the production of fruit and vegetables in your vegetable garden. In autumn, you will be able to admire the incessant ballet of birds that come to feed on the mature seeds they find in the heart of the dried flowers.

Flowering

Flower colour yellow
Flowering time July to September
Inflorescence Flower head
Flower size 7 cm
Bee-friendly Attracts pollinators
Good for cut flowers Cut flower blooms
Flowering description Les Fleurs sont de grandes marguerites (capitules) solitaires à cœur proéminent noir et à corolle retombante jaune. Les longs pétales régulièrement rangés autour du cœur de la fleur lui donnent un diamètre variant de 5 à 7 cm.

Foliage

Foliage persistence Semi-evergreen
Foliage colour green
Foliage description Touffe de feuilles basales lancéolées, dentées, vert bleuté de 5 à 10 cm d’où s’élèvent les tiges florales robustes et ramifiées. Les tiges portent des feuilles caulinaires plus étroites et de forme plutôt ovale.

Plant habit

Height at maturity 60 cm
Spread at maturity 30 cm
Growth rate slow

Botanical data

Genus

Rudbeckia

Species

amplexicaulis

Family

Asteraceae

Other common names

Clasping Coneflower

Origin

Cultivar or hybrid

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Planting and care

Before sowing Rudbeckia, place your seeds in the vegetable drawer of your refrigerator for 4 weeks. This will lift the dormancy of the seed and thus improve the success of your sowing.

Sow Rudbeckia amplexicaulis from February to March in a tray. Use a good quality soil and sieve the surface so that the seed will bind to the growing medium. Before sowing, lightly tamp down the soil with a small plank of wood. Broadcast your seeds. Cover the seeds by sprinkling topsoil or vermiculite on top, tamp down lightly and water generously with a fine spray. Place your tray in the light, without direct sunlight, at a temperature of 15°c to 20°c.

Seed emergence will take 30 to 120 days. As soon as the seedlings can be handled, transplant them into 7 cm pots. Keep the soil moist but not waterlogged during growth. Then, 15 days before finally placing them in their final positions, begin to acclimatize them gradually to temperatures close to those outside.

At the end of May, beginning of June, the temperature in the garden will be warm enough to planting out your young plants. Choose a site with plenty of sunshine. Add a good shovelful of compost to each planting hole. Space your plants 30 cm apart.

Regularly remove faded flowers to maintain the plant’s beauty and encourage the renewal of blooms.

Sowing period

Sowing period March to April
Germination time (days) 120 days

Intended location

Suitable for Meadow, Woodland edge
Type of use Border, Slope
Hardiness Hardy down to -29°C (USDA zone 5) Show map
Ease of cultivation Amateur
Exposure Sun
Soil pH Any
Soil moisture Moist soil, Drainant, riche

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