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Cosmos Sensation Purity Seeds - Cosmos bipinnatus

Cosmos x bipinnatus Purity
Garden Cosmos, Mexican Aster

4,5/5
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2 reviews

Beautiful development from seeds, into young plants and then into vigorous cosmos, endless flowering! They are quite tall so they tend to bend.

julie, 16/10/2024

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This plant carries a 6 months recovery warranty

More information

Cosmos 'Purity' is a selection that displays snow white blooms over ferny, light green foliage. They appear all season long on semi-tall plants, ideal for cutting! Easy to grow and effortlessly romantic, Cosmos thrive in light soil in a sunny position.
Flower size
10 cm
Height at maturity
1.20 m
Exposure
Sun
Annual / Perennial
Annual
Germination time (days)
15 days
Sowing method
Direct sowing, Sowing under cover, Sowing under cover with heat
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Sowing period February to May
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Flowering time June to October
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Description

Cosmos 'Purity' is a selection that displays snow white blooms over ferny, light green foliage. They appear all season long on semi-tall plants, ideal for cutting! Easy to grow and effortlessly romantic, Cosmos thrive in light soil in a sunny position.

Cosmos bipinnatus is a tender annual plant native to Mexico and the southernmost part of the United States. It belongs to the Asteraceae family alongside Dahlias and daisies, featuring the characteristic inflorescences known as capitulums and very fine, feathery foliage. 'Sensation Purity' quickly forms semi-tall clumps, about 90 cm tall and 45 cm wide. Flowering starts in June-July and lasts until October (or the first frosts). The flower heads measure about 10 cm across and are made up of a layer of pure white petals arranged around a golden central disc. Cosmos are a magnet to foraging insects and butterflies, including the monarch butterfly. The finely cut, cloud-like foliage resembles fennel leaves and is delicately scented. Flowers are followed by blackish, spiky seed heads (achenes).

Cosmos is an easy-going, rewarding annual that can single handedly fill a sunny slope, border or flower bed. It is perfect to animate romantic or cottage style gardens. Easy to grow even by beginners, this adorable plant with its feathery green leaves and naive flowers bring light and airiness to heavier blooms such as Dahlias. It combines well with perennial sage, Verbena bonariensis and chrysanthemums until the first frosts. It is particularly useful in new gardens mixed with poppies, love-in-a-mist or cornflowers. Its pretty blooms have a long vase life and are ideal for cutting.

Cosmos Sensation Purity Seeds - Cosmos bipinnatus in pictures

Cosmos Sensation Purity Seeds - Cosmos bipinnatus (Flowering) Flowering

Flowering

Flower colour white
Flowering time June to October
Inflorescence Flower head
Flower size 10 cm
Bee-friendly Attracts pollinators
Good for cut flowers Cut flower blooms

Foliage

Foliage persistence Annual
Foliage colour green

Plant habit

Height at maturity 1.20 m
Spread at maturity 45 cm
Growth rate fast

Botanical data

Genus

Cosmos

Species

x bipinnatus

Cultivar

Purity

Family

Asteraceae

Other common names

Garden Cosmos, Mexican Aster

Origin

Cultivar or hybrid

Product reference80611111

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Planting and care

Sow Cosmos seeds from March to May, at a depth of 3mm, in a fine compost and cover the seeds with a very light sprinkling of vermiculite. Place the seed tray in a mini-greenhouse at a temperature of 18-25°C or wrap it in a polyethylene bag. Keep the soil moist but not waterlogged. Light promotes germination, which occurs 7 to 15 days after sowing.

When the seedlings are large enough to handle, transplant them into individual pots with a diameter of 7cm. Grow them in cooler conditions until the plants are sufficiently developed to be planted outside. When all risk of frost has passed, gradually acclimatize the plants to outdoor conditions for 7 to 10 days.

Plant them in full sun, in a moist, well-drained soil, spaced 45cm apart. Pinch out the tips of the shoots on each stem, during transplantation, to encourage branching of the stems and the production of numerous flowers. Cosmos prefer a soil pH between 6 and 8.5, which corresponds to the soil of their native habitat, the alkaline regions of Central America. They prefer full sun but tolerate partial shade. These plants are drought-tolerant once established, they are not very susceptible to diseases but may be targeted by aphids. Spontaneous seedlings are common but not always true to type, without becoming invasive.

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Sowing period

Sowing period February to May
Sowing method Direct sowing, Sowing under cover, Sowing under cover with heat
Germination time (days) 15 days

Intended location

Suitable for Meadow
Type of use Border, Back of border, Slope, Vegetable garden
Ease of cultivation Beginner
Exposure Sun
Soil pH Any
Soil moisture Dry soil, Moist soil, Draining, rich
4,5/5
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