Sunflower Soluna Bronze seeds - Helianthus annuus
Sunflower Soluna Bronze seeds - Helianthus annuus
Helianthus annuus Soluna Bronze
Sunflower, Common Sunflower
Seeds sown in pots, properly cared for. None have sprouted. Difficult?
alix, 23/10/2025
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Description
Helianthus debilis 'Soluna Bronze' is an annual sunflower selection that produces abundant, modest-sized flowers in a rich palette of yellow to coppery-orange tones. Its flowers have a large dark centre and bloom in shimmering clusters throughout summer. This fast-growing variety is really easy to sow and grow in all types of well-drained soils. It is a good plant for wildflower beds and large flower borders.
'Soluna Bronze' is a very recent horticultural creation. This sunflower is part of a series of cultivars derived from Helianthus debilis selected for their unique colours and excellent branching. The botanical species H. debilis is an annual plant of the Asteraceae family native to the east coast of the United States. The 'Soluna Bronze' variety forms a branching clump that reaches an average height of 1.10 m (4ft) when in bloom, in just a few weeks. Flowering usually begins in July and can continue until September. It takes the form of 8 cm (3in) diameter flower heads, with ligulate petals around an almost black centre. The heads vary in colour from yellow to bronze and coppery-orange and bloom in clusters towards the top of the stems. The floral stems are purple, short, sturdy, and well-branched. The foliage consists of fairly dark green leaves, of varying shapes and sizes, that are simple, alternate, and sometimes opposite at the base.
Its ease of cultivation, large easy-to-germinate seeds, and reasonable size make it very popular with children who are starting gardening with sunflowers. 'Soluna Bronze' is particularly suited for the back of flower beds, but also for decorative use in the vegetable garden where it attracts many beneficial animals. It only needs sunlight and soil that is not too dry to flourish. It is a plant with a rustic appearance and, as such, it blends well in slightly wild areas of the garden, alongside cosmos, sainfoin, perennial sweet peas, scabious, blanket flowers...
Before flowering, the plant optimises its growth by following the path of the sun. This phenomenon is called heliotropism and has given rise to some of its common names: Heliotrope, Sunflower, Sunflower, Garden Sun...
An ecological asset:
Throughout summer, the nectar-rich flowers attract pollinating insects and butterflies. A good way to improve the ecosystem of your garden and promote the production of fruits and vegetables in your vegetable garden.
The oil-rich seeds are particularly appreciated by birds (Parrots, Tits, Goldfinches...). After flowering, harvest them to feed birds during the winter scarcity.
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Flowering
Foliage
Plant habit
Botanical data
Helianthus
annuus
Soluna Bronze
Asteraceae
Sunflower, Common Sunflower
Cultivar or hybrid
Planting and care
Sow the Sunflower Soluna Bronze from March to May in pots. Use good quality potting soil sifted on the surface to bind the seed to its substrate. Before sowing, lightly press the soil with a board. Place 2 seeds 10 cm (4in) apart in each pot. Cover the seeds by sprinkling soil or vermiculite on top, lightly press down and water generously with a fine rose. Place your pots in light, without direct sunlight, at a temperature of 20°C (68°F) to 25°C (77°F). Lower the temperature at night to 17°C (62.6°F) to create a beneficial alternation for germination.
The seeds will take about 21 days to germinate. Keep the soil moist, but not excessively during growth. 15 days before their final placement, start gradually acclimatising them to a temperature of 15°C (59°F).
By the end of May or early June, the temperature in the garden will be warm enough to plant your young plants. Choose a sunny location. Add a good shovelful of compost to each planting hole. Space your plants 45 cm (18in) apart.
The seeds can be sown directly in May. By staggering your sowings, you can extend flowering until autumn.
Protect your seedlings from attacks by snails and slugs, which are fond of these young plants. Sowing chives nearby may keep aphids away.
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.
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