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Cosmos bipinnatus Xanthos - Garden Cosmos

Cosmos x bipinnatus Xanthos
Garden Cosmos, Mexican Aster

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Francis V., 07/09/2020

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This plant carries a 6 months recovery warranty

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Value-for-money
A new compact cosmos, with delicious yellow flowers. This annual plant, full of light flowers, provides its abundant flowering for 6 months, until autumn. Its flowers are of a unique pastel yellow, carried by sturdy and solid stems adorned with dark green fennel foliage. This plant, which can fit anywhere, will bring a lot of charm and poetry to borders and even to planters.
Flower size
6 cm
Height at maturity
60 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 April to June
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Flowering time May to October
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Description

The Cosmos bipinnatus 'Xanthos' is a new variety with a compact habit and absolutely delightful pastel yellow flowers, never before seen in the compact varieties available in the market. This annual plant provides abundant flowering for 6 months, until autumn, even in poor and relatively dry soil. Its flowers are carried on sturdy and branched stems, adorned with dark green fennel-like foliage. This plant, which can fit anywhere, will bring a lot of charm and poetry to the late season, in borders, among perennials, and even in containers.

 

The 'Xanthos' Cosmos is one of the many cultivars of this well-deserved popular annual known as Cosmos bipinnatus. Related to Dahlias, Cosmos belong to the family Asteraceae. They have the characteristic inflorescence in a head, which we call a flower. 'Xanthos' has particularly fine foliage, described as pinnatisect, reminiscent of fennel, and it is slightly and pleasantly scented. This compact variety quickly forms a dense and bushy clump 60 cm (24in) in height, and 40 cm (16in) in width. The early flowering begins in May and lasts until October, only ceasing with the first frost. The heads measure 6 cm (2in) in diameter and are composed of a crown of plicate petals in a very pale yellow, warmed by a slightly deeper yellow at the center of the petals. The center of the head is made up of a small golden disk that turns brown after pollination. The flowers attract many insects and butterflies, including the Monarch.

  

Capable of filling a container alone from spring until frost, or colonizing a slope, a bed, the 'Xanthos' Cosmos offers an abundance of single flowers with childlike patterns, in an extremely bright colour. Cosmos are flowers made for beginners, almost impossible to fail. These plants bring density to borders and lightness to the heavier flowering of perennials, without succumbing to bad weather. This lovely Xanthos variety can be used in pots on the terrace or balcony, but also in countryside settings, mixed with marigolds and calendulas, cornflowers and grasses like Stipa tenuifolia, white gauras, or among perennials that love the sun as much as it does, bidens and rudbeckias. Its flowers have a very good vase life.

 

Note: Please be advised 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 being placed outdoors once the risk of frost has definitively passed.

 

Cosmos bipinnatus Xanthos - Garden Cosmos in pictures

Cosmos bipinnatus Xanthos - Garden Cosmos (Flowering) Flowering
Cosmos bipinnatus Xanthos - Garden Cosmos (Foliage) Foliage

Flowering

Flower colour yellow
Flowering time May to October
Inflorescence Flower head
Flower size 6 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 60 cm
Spread at maturity 40 cm
Growth rate very fast

Botanical data

Genus

Cosmos

Species

x bipinnatus

Cultivar

Xanthos

Family

Asteraceae

Other common names

Garden Cosmos, Mexican Aster

Origin

Cultivar or hybrid

Planting and care

The 'Xanthos' Cosmos loves the sun and is easy to grow, even in degraded soil. Place it in a moderately fertile neutral soil, cool but well-drained. 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 and the production of numerous flowers. Cosmos prefer full sun, but tolerate partial shade. These plants are drought resistant once established, they are not prone to diseases, but can be targeted by aphids. Spontaneous seedlings are frequent, but not always reliable, without becoming invasive. To prolong flowering, remove faded flowers. Water regularly in case of prolonged drought and possibly mulch to protect from drying out.

Planting period

Best planting time April
Recommended planting time April to June

Intended location

Suitable for Meadow, Rockery
Type of use Border, Edge of border, Container, 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 Neutral, 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 instructions You can remove the faded flowers, this will encourage the plant to produce new ones.
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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