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Rudbeckia fulgida var. sullivantii Goldsturm Seeds - Black-eyed Susan

Rudbeckia fulgida var. sullivantii Goldsturm
Sullivant's Coneflower, Black-Eyed Susan

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Hardy medium-sized (60 cm) perennial plant that bears yellow flowers with black eyes that blooms continuously from July to October. This Rudbeckia is used in sunny or partially shaded beds and also provides beautiful flower stems for the arrangement of fresh and dried flower bouquets.
Flower size
13 cm
Height at maturity
60 cm
Exposure
Sun, Partial shade
Annual / Perennial
Perennial
Germination time (days)
28 days
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Sowing period March to April
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Flowering time July to October
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Description

Rudbeckia Goldsturm is a perennial plant known for its hardiness and ease of cultivation.

Native to the United States, Rudbeckia fulgida var. sullivantii Goldsturm is distinguished by its medium size, being 60 cm shorter than the type species (which reaches a height of 100 cm) and its abundant blooms.

The foliage consists of a clump of lanceolate, toothed, dark green leaves from which rise sturdy, branched flower stems. The stems bear leaves that get smaller, the closer they are placed to their tips.

The flowers of Rudbeckias are large solitary daisies (pseudanthia) with prominent black centres and bright yellow corollas. The long petals are regularly arranged around the centre of the flower, giving it an impressive average diameter of 13 cm. The large number of flowers which renew themselves continuously from July to October, form a blooming mass that ripples with each passing breeze. This flowerbed is a source of fresh flowers for the making of bouquets.

At the end of summer, the yellow petals fade and fall, while the cone-shaped centre of the flowers dries and mummifies. Flower can also be picked at this stage and incorporated into a dried flower bouquet.

The Rudbeckia Goldsturm is very hardy and likes sunny or partially shaded situations. It thrives in rich, heavy, moist soil as long it is well-drained. Its rhizomatous roots allow its clumps to grow and fill out quickly.

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.

Rudbeckia fulgida var. sullivantii Goldsturm Seeds - Black-eyed Susan in pictures

Rudbeckia fulgida var. sullivantii Goldsturm Seeds - Black-eyed Susan (Flowering) Flowering

Flowering

Flower colour yellow
Flowering time July to October
Inflorescence Solitary
Flower size 13 cm
Bee-friendly Attracts pollinators
Good for cut flowers Cut flower blooms
Flowering description Grands capitules solitaires de 13cm de diamètre, à cœur proéminent noir et à corolle jaune vif.

Foliage

Foliage persistence Semi-evergreen
Foliage colour dark green
Foliage description Feuilles lancéolées, dentées, vert foncé dont s’élèvent des tiges florales robustes et ramifiées. Les tiges portent des feuilles de plus en plus petites au fur et à mesure qu’on approche de leur extrémité.

Plant habit

Height at maturity 60 cm
Spread at maturity 60 cm
Growth rate fast

Botanical data

Genus

Rudbeckia

Species

fulgida var. sullivantii

Cultivar

Goldsturm

Family

Asteraceae

Other common names

Sullivant's Coneflower, Black-Eyed Susan

Origin

North America

Product reference13291

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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 Goldsturm from February to March in a tray. Use 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 18°c to 20°c. Lower the temperature at night to 16°c in order to create a beneficial alternation for better results.

Seed emergence will take 21 to 28 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 a temperature of 15°c.

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 40 cm apart.

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

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Sowing period

Sowing period March to April
Germination time (days) 28 days

Intended location

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

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