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Cosmos Rubenza Carmine Red plugs - Garden Cosmos

Cosmos x bipinnatus Rubenza rouge carmin
Garden Cosmos, Mexican Aster

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1 reviews

Very disappointed. The cosmos were placed upside down in the box (which I opened properly from the top) and were completely disarrayed at the bottom of the box (just like the annual rudbeckias). I might be able to salvage two or three, and even then it's not certain given their condition. I have been a regular customer for many years, but now I feel deceived.

Nathalie, 18/03/2023

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This plant carries a 6 months recovery warranty

More information

A new selection of cosmos that produces very large and magnificent velvety flowers, measuring 15 to 20 cm (6 to 8in) in diameter, in a deep red color turning to intense pink, from the end of May until October. This spectacular cosmos is particularly suitable for making bouquets. It will also have a great effect in wildflower beds, with grasses or large daisies for example. 
Flower size
18 cm
Height at maturity
90 cm
Spread at maturity
40 cm
Exposure
Sun
Hardiness
Hardy down to -1°C
Soil moisture
Moist soil
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Best planting time April
Recommended planting time May to June
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Flowering time June to October
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Description

The 'Rubenza' carmine red Cosmos is a spectacular variety, unique in size and colour of its flowers, which earned it recognition at Fleuroslect. Its velvety flowers, as large as a hand, open in dark ruby red and then turn into intense pink, creating a stunning two-tone effect on the plant. They continue to bloom until October, carried by stems adorned with delicate fennel-like foliage. An excellent cut flower, this annual plant also makes a big impact in wildflower meadows and prairies.

  

The 'Rubenza' Cosmos is one of the many cultivars of this popular annual known as Cosmos bipinnatus. Related to Dahlias, Cosmos belong to the aster family. They have the characteristic inflorescence in the form of a head. 'Rubenza' has finely cut foliage, referred to as pinnate, resembling that of fennel. It is slightly and pleasantly scented. This variety quickly forms a dense clump, reaching 90 cm (35in) in height and 30-40 cm (12-16in) in width. Flowering begins in June and lasts until October, only ending with the first frost. The heads measure 15 cm (6in) and sometimes even up to 20 cm (8in) in diameter, composed of a crown of deep carmine red pleated petals that turn into bright magenta pink. The center is made up of a golden disc. They attract numerous insects and butterflies, including the Monarch.

  

Capable of transforming a slope, a bed, or a wildflower meadow, the 'Rubenza' Cosmos abundantly offers its immense single flowers, visible from afar. Cosmos flowers are perfect for beginners, almost impossible to fail. This plant brings a lot of colour to beds and allows for the creation of stunning bouquets for months. It can be used in rustic settings, mixed with grasses (Miscanthus, Pennisetum, Panicum, etc.), Argentine vervain, cornflowers, or among perennials that love the sun as much as it does, such as large daisies, heleniums, asters, and sunflowers, for example. Its association with white dahlias and goldenrods (Solidago) is also remarkable.

Note: Please be aware that our young plug plants are professional products intended for experienced gardeners: upon receipt, transplant and store them under cover (veranda, greenhouse, cold frame) at a temperature above 14°C (57.2°F) for a few weeks before planting them outdoors once the risk of frost is definitively gone.

 

 

Cosmos Rubenza Carmine Red plugs - Garden Cosmos in pictures

Cosmos Rubenza Carmine Red plugs - Garden Cosmos (Flowering) Flowering

Flowering

Flower colour red
Flowering time June to October
Inflorescence Flower head
Flower size 18 cm
Bee-friendly Attracts pollinators
Good for cut flowers Cut flower blooms

Foliage

Foliage persistence Annual
Foliage colour dark green
Aromatic? Fragrant foliage when creased
Foliage description Slightly fragrant

Plant habit

Height at maturity 90 cm
Spread at maturity 40 cm
Growth rate very fast

Botanical data

Genus

Cosmos

Species

x bipinnatus

Cultivar

Rubenza rouge carmin

Family

Asteraceae

Other common names

Garden Cosmos, Mexican Aster

Origin

Cultivar or hybrid

Planting and care

The 'Rubenza' Cosmos loves the sun and is easy to grow, even in degraded soil. Place it in a moderately fertile, fresh but well-drained neutral soil. Plant it in spring, after frost, for flowering from June to October.

Pinch the tips of the shoots on each stem, during transplantation, to encourage branching of the stems and the production of many flowers. Cosmos prefer full sun, but tolerate partial shade. These plants are drought resistant once established, they are not very susceptible to diseases, but can be targeted by aphids. Spontaneous sowings are frequent, but not always reliable, without becoming invasive. To prolong flowering, remove faded flowers. Water regularly in case of prolonged drought and optionally mulch to protect from drying out.

 

Planting period

Best planting time April
Recommended planting time May to June

Intended location

Suitable for Meadow
Type of use Border, Slope
Hardiness Hardy down to -1°C (USDA zone 10a) Show map
Ease of cultivation Beginner
Planting density 6 per m2
Exposure Sun
Soil pH Any
Soil type Chalky (poor, alkaline and well-drained), Silty-loamy (rich and light), Stony (poor and well-drained)
Soil moisture Moist soil, well-drained

Care

Pruning No pruning necessary
Disease resistance Good
Overwinter Can be left in the ground
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