Cosmos bipinnatus Rosetta Seeds
Cosmos bipinnatus Rosetta Seeds
Cosmos bipinnatus Rosetta Seeds
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Brigitte B.
Cosmos bipinnatus Rosetta Seeds
Brigitte B. • 37 FR
Brigitte B.
Cosmos bipinnatus Rosetta Seeds
Brigitte B. • 37 FR
Cosmos bipinnatus Rosetta Seeds
Cosmos x bipinnatus Rosetta
Garden Cosmos, Mexican Aster
Simply Splendid! This lovely colour, combined with the Cosmos Fairy Cake, creates a very delightful outcome in the garden. Not to mention the beautiful plating decoration. Well done.
Brigitte, 07/07/2022
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Description
Cosmos Rosetta is a recent selection, awarded by Fleuroselect in 2016 for excellent flower colour, size and unique architecture. It blooms prolifically all season long, displaying randomly streaked pink and white flowers, some with an inner collarette. Sow in light soil in a sunny position, and then water and let nature take its course! Cosmos are practically impossible to fail!
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 a capitulum and very fine, feathery foliage. Rosetta quickly forms an 80 cm (31.5 in) high, 30 cm (11.8 in) wide clump. Flowering starts in July, 60 to 90 days after sowing, and lasts until October (or the first frosts). The flower heads measure about 10 cm (3.9 in) across and are made up of one or more layers of petals arranged around a golden central disc. Each petal is unique, randomly striped with deep pink and rose on a white background. Cosmos are a magnet for 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 for livening up romantic or cottage-style gardens. Easy to grow even by beginners, this adorable plant with its feathery green leaves and naive flowers brings 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. When cut, its pretty blooms have a long vase life.
Cosmos bipinnatus Rosetta Seeds in pictures
Flowering
Foliage
Plant habit
Botanical data
Cosmos
x bipinnatus
Rosetta
Asteraceae
Garden Cosmos, Mexican Aster
Cultivar or hybrid
Planting and care
Sow Cosmos seeds from March to May, at a depth of 3 mm (0.1 in), in a fine compost and cover the seeds with a very light sprinkle of vermiculite. Place the seed tray in a mini-greenhouse at a temperature of 18-25 °C (64.4-77 °F) 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 7 cm (2.8 in). Grow them in cooler conditions until the plants are sufficiently developed to be planted outdoors. When all risk of frost has passed, gradually acclimatise the plants to outdoor conditions for 7 to 10 days. Plant them in full sun, in a well-drained, moist soil, spaced 45 cm (17.7 in) apart. Pinch 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, corresponding to the habitat's original soil, the alkaline regions of Central America. They 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 common but not always faithful, without becoming invasive.
Sowing period
Intended location
Planting & care advice
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Hardiness is the lowest winter temperature a plant can endure without suffering serious damage or even dying. However, hardiness is affected by location (a sheltered area, such as a patio), protection (winter cover) and soil type (hardiness is improved by well-drained soil).
The flowering period indicated on our website applies to countries and regions located in USDA zone 8 (France, the United Kingdom, Ireland, the Netherlands, etc.)
It will vary according to where you live:- In zones 9 to 10 (Italy, Spain, Greece, etc.), flowering will occur about 2 to 4 weeks earlier.
- In zones 6 to 7 (Germany, Poland, Slovenia, and lower mountainous regions), flowering will be delayed by 2 to 3 weeks.
- In zone 5 (Central Europe, Scandinavia), blooming will be delayed by 3 to 5 weeks.
In temperate climates, pruning of spring-flowering shrubs (forsythia, spireas, etc.) should be done just after flowering.
Pruning of summer-flowering shrubs (Indian Lilac, Perovskia, etc.) can be done in winter or spring.
In cold regions as well as with frost-sensitive plants, avoid pruning too early when severe frosts may still occur.
The planting period indicated on our website applies to countries and regions located in USDA zone 8 (France, United Kingdom, Ireland, Netherlands).
It will vary according to where you live:
- In Mediterranean zones (Marseille, Madrid, Milan, etc.), autumn and winter are the best planting periods.
- In continental zones (Strasbourg, Munich, Vienna, etc.), delay planting by 2 to 3 weeks in spring and bring it forward by 2 to 4 weeks in autumn.
- In mountainous regions (the Alps, Pyrenees, Carpathians, etc.), it is best to plant in late spring (May-June) or late summer (August-September).
The harvesting period indicated on our website applies to countries and regions in USDA zone 8 (France, England, Ireland, the Netherlands).
In colder areas (Scandinavia, Poland, Austria...) fruit and vegetable harvests are likely to be delayed by 3-4 weeks.
In warmer areas (Italy, Spain, Greece, etc.), harvesting will probably take place earlier, depending on weather conditions.
The sowing periods indicated on our website apply to countries and regions within USDA Zone 8 (France, UK, Ireland, Netherlands).
In colder areas (Scandinavia, Poland, Austria...), delay any outdoor sowing by 3-4 weeks, or sow under glass.
In warmer climes (Italy, Spain, Greece, etc.), bring outdoor sowing forward by a few weeks.