Sunflower Astra Yellow Brown F1 | Helianthus annuus | Multiple blooms on a single stem

Sunflower ‘Astra Yellow Brown’ F1

Helianthus annuus | Multi-Branching Sunflower

Sunflower ‘Astra Yellow Brown’ F1 is an unusual, multi-branched sunflower producing multiple blooms on a single stem. The semi-double, star-shaped flowers feature fluffy centres in warm yellow-brown and bronze tones, creating a rich, autumnal look. As the season progresses, flower tones may develop subtle pinkish hues, adding extra interest.

This variety forms medium-tall plants with sturdy stems and numerous long side shoots that flower successively over a long period. Growing to around 100–120 cm, ‘Astra Yellow Brown’ is well suited for flower beds, mixed borders, and cutting gardens. It is also a favourite with children, as sunflowers are easy, fast, and rewarding to grow.

Unlike many tall sunflowers, this variety is surprisingly tolerant of partial shade, making it ideal for planting near fences, walls, large trees, or even close to water features. The flowers are excellent for cutting—dramatic, long-lasting, and effortless to arrange.

Plant Information

• Botanical name: Helianthus annuus
• Variety: Astra Yellow Brown F1
• Common name: Sunflower
• Plant type: Annual flower
• Lifecycle: Annual
• Height: 100–120 cm
• Spread: 40–50 cm
• Growth rate: Fast
• Flower colour: Bronze-yellow with fluffy centres
• Bloom season: July – September
• Light requirements: Full sun (tolerates partial shade)
• Hardiness zones: 3–9
• Best uses: Flower beds, cut flowers, containers, mixed borders, wildlife gardens

Germination Instructions

• Pre-treatment: Not required
• Sow directly where plants are to flower
• Sow 15 mm deep into finely prepared soil
• Sow 2 seeds every 45 cm
• Germination: 10–21 days
• When seedlings are large enough, thin to the strongest plant
• Water well until established

Can also be started indoors:
Sow one seed per pot in March–April. Keep at 20–25 °C until germination, then move to a bright, cooler position. Harden off and plant out after risk of frost has passed.

Growing Instructions

• Easy to grow and very rewarding
• Plant in full sun with good air circulation
• Prefers fertile, well-drained soil
• Water deeply but infrequently
• Feed lightly during the growing season
• Taller plants may require staking or support, especially in windy locations

Cultivation Notes

• Excellent cut flower variety
• Produces flowers continuously due to branching habit
• For seed saving, protect flower heads from birds or cut and dry indoors
• Seeds are ready approximately 30–45 days after flowering
• Dried seed heads can be used to feed wildlife in winter

Soil Preferences

• Soil type: Fertile, moist, clay, loam, or sandy soils
• Soil pH: Neutral to alkaline
• Water needs: Average