How to Grow
Sunflower 'Ring of Fire' from Seed
The solar-eclipse bicolour sunflower — Half-Hardy Annual; AAS winner + Fleuroselect award; mahogany-red ring + golden-yellow edges around dark chocolate disc; pollenless; branching to 120–150cm; later to bloom (100–120 days) peaking August–October; day-length neutral; sow one per pot April at 18–22°C; plant late May–June at 45cm; full sun; the dramatic bicolour that arrives when most other sunflowers have finished
Sunflower 'Ring of Fire' is the bicolour sunflower that stops visitors in their tracks: the combination of a ring of deep mahogany-red surrounding the dark chocolate-brown central disc, with golden-yellow petals flaring outward from the red corona, creates the solar eclipse effect that has given the variety its name and earned it the All-America Selections award from independent North American triallists and the Fleuroselect Industry Award from the professional European flower growing trade simultaneously — a recognition of real-world garden performance that few individual sunflower varieties can claim.
The practical profile of Ring of Fire reflects its award pedigree: it is a branching variety producing multiple blooms per plant over an extended season; it is pollenless, giving it a 10–14 day vase life without pollen staining; and it is a later bloomer (100–120 days to full bicolour) that peaks from August through October — precisely when the garden most needs fresh drama. In a Norfolk cottage garden, Ring of Fire from an April sowing provides the bold late-summer display that bridges the gap between the high-summer border and the first frosts, the bicolour solar eclipse burning against the cooling air of September and October.
Quick Facts at a Glance
Plant Type
Half-Hardy Annual — blazing bicolour; AAS winner and Fleuroselect Industry Award
Colour
Mahogany-red ring around dark chocolate centre; golden-yellow petal edges; solar-eclipse look
Awards
All-America Selections AND Fleuroselect — both awarded on independent multi-site trials
Pollenless
Sterile disc flowers — no pollen drop; longer vase life; no surface staining
Later bloomer
100–120 days to full bicolour; the dramatic late-season sunflower August–October
Difficulty
2 out of 5 — as easy as any sunflower; patience in July is rewarded in October
Understanding Ring of Fire
Sow in Individual Pots — Sunflowers Dislike Root Disturbance
Sow one seed per 7–9cm pot at 1–2cm depth. Sunflowers develop a long taproot from the earliest stage and resent being root-bound or transplanted with disturbed roots. Plant out before roots begin circling the base of the pot, handling the root ball very gently.
Frost-Tender Throughout — Plant Out Late May to June Only
Sunflowers are half-hardy annuals and completely frost-tender at every stage. Do not plant out until all frost risk has passed and the soil has begun to warm. Harden off over 7–10 days before final outdoor planting.
The Bicolour Solar Eclipse
Sunflower Ring of Fire produces flowers with golden petal edges, a ring of deep mahogany-red surrounding a dark chocolate-brown disc — the visual effect of a solar eclipse seen at maximum. The three concentric colour zones (dark centre, red corona, golden outer petals) give Ring of Fire more visual complexity at close range than any single-coloured sunflower, making it equally interesting as a garden border plant and as a cut flower. Flowers reach 12–15cm across on a heavily branching plant that grows to 120–150cm, producing multiple blooms over an extended period from August into October.
A Later Bloomer — Patience Rewarded
Ring of Fire may require 100–120 days from sowing to show its full bicolour blooms — later than most other sunflowers. This later-season quality is a genuine practical advantage: an April sowing produces peak flowers from August through October, precisely when the first flush of summer border colour has ended and the garden most needs renewed drama. The All-America Selections citation noted that "this late-season display is often what the garden needs for a fresh new look." It is also described as day-length neutral, meaning it produces flowers consistently regardless of day length throughout the season.
Sowing & Growing On
Sow One Per 7–9cm Pot April at 18–22°C — 7–10 Days — Plant Late May–June at 45cm — Full Sun — Water at Base
Sow one seed per 7–9cm pot at 1–2cm depth in April at 18–22°C. Move to bright light immediately on germination (7–10 days). Harden off 7–10 days. Plant late May–June at 45cm in full sun. Water at the base. Succession sow April + mid-May for an extended bicolour display.
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Sow one seed per 7–9cm pot at 1–2cm depth in April at 18–22°C. Germination 7–10 days. Move to the brightest available position immediately and turn pots daily on a windowsill. Ring of Fire is day-length neutral — it produces flowers throughout the season regardless of day length, making timing flexible.
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Harden off over 7–10 days and plant out late May–June at 45cm spacing in full sun. Prepare the bed with a shovelful of compost per planting position. Water in well and maintain consistent moisture throughout the growing season — branching plants producing multiple flower heads need consistent water supply.
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Support plants with a bamboo cane in exposed positions. At 120–150cm, Ring of Fire is self-supporting in sheltered positions but benefits from a cane tied loosely at 80cm in gardens exposed to summer storms. Insert canes at planting time rather than later, when root systems are established.
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Succession sow April + mid-May to extend the bicolour display from August into October. Two batches three to four weeks apart provide sequential peak production periods, ensuring a longer window of fresh bicolour cutting material and continuous garden display through the entire late-summer and autumn period.
Growing On & Care
The Award Pedigree
Ring of Fire holds two significant independent industry awards: the All-America Selections award — the oldest independent trial organisation for new varieties in North America — and the Fleuroselect Industry Award, which recognises outstanding introductions to the professional European flower growing trade. Both are based on independently-conducted multi-site garden trials rather than marketing assessments. Earning both simultaneously confirms that Ring of Fire's performance in real garden conditions is genuinely exceptional.
As a Cut Flower
Ring of Fire is an outstanding cut flower: the bicolour blooms are visually distinctive in mixed arrangements, the pollenless character prevents yellow pollen staining on surfaces, and the vase life of 10–14 days is excellent. Cut when the outer petals are fully unfurled but the disc is firm. Re-cut at an angle under water and condition in deep water for 4 hours. The mahogany-red and golden-yellow bicolour works particularly well in warm autumn-palette arrangements alongside orange Rudbeckia and copper Helenium.
Late-Season Drama
The defining quality of Ring of Fire in the garden is its late-season contribution. When July-sown annuals are finishing and August begins to suggest the approach of autumn, Ring of Fire from an April sowing is typically entering its peak — the bicolour flowers showing their most developed colour in the lower-angle light of late summer. Combined with its day-length neutral quality, Ring of Fire remains actively productive through September and into October, one of the few sunflowers that genuinely bridges the gap between the summer garden and the autumn display.
Pollinators and Birds
Although Ring of Fire has pollenless disc flowers, it still provides nectar accessible to bees and butterflies throughout the season. At the end of the season, if some flower heads are left to develop without cutting, the ripening seed heads attract seed-eating birds — particularly goldfinches, which are among the most charming wildlife visitors to a sunflower patch in autumn and early winter.
Succession for Maximum Display
For the fullest possible bicolour display across the late-summer and autumn periods: sow batch one in early April (for August–September flowers) and batch two in mid-May (for September–October flowers). The two batches overlap sufficiently that at least one batch is always in active production from August through October, providing a continuous supply of the distinctive solar-eclipse blooms for cutting and border display.
In Large Containers
At 120–150cm, Ring of Fire is at the upper end of what is practical in a container, but in a very large container (45–50 litres minimum) with good compost and daily summer watering, it performs effectively as a dramatic patio focal point. The compact branching habit relative to taller single-stemmed varieties makes it more stable and manageable than giant types in container conditions. Feed weekly from June with a balanced liquid fertiliser.
Sowing & Flowering Calendar
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
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| Sow (Apr; one per pot; 18–22°C) |
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| Optional second sow (mid-May) |
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| Plant out (late May–Jun; full sun; 45cm) |
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| Bicolour flowers (Aug–Oct; late season drama) |
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Common Problems & Solutions
| Problem | Likely Cause | What to Do |
|---|---|---|
| Bicolour not visible; flowers appear all yellow | Plant not yet mature; bicolour develops fully at peak | Ring of Fire needs 100–120 days from sowing. The full mahogany-red ring develops at maturity. First flowers may show less defined bicolour; later-season flowers on established plants show the most dramatic pattern. |
| Stems flopping in late season | Exposed position; heavy branching plant | Insert a bamboo cane at planting time and tie loosely at 80–100cm. Late-season branching plants carry significant weight. |
| Leggy seedlings during growing-on | Insufficient light; not turned daily | Move to brightest position immediately on germination. Turn pots daily. A south-facing windowsill is the minimum requirement during the growing-on period. |
| Flower heads eaten before harvest | Birds targeting ripening seed heads | Harvest stems regularly for cutting. For bird-feeding purposes, leave a few heads intentionally to ripen and attract goldfinches from September onward. |
Plant Specifications
The solar-eclipse bicolour arrives in August and burns on until October — worth every day of patience in July
Sow one seed per 7–9cm pot at 1–2cm depth in April at 18–22°C (7–10 days). Move to bright light immediately. Harden off 7–10 days. Plant at 45cm in full sun late May–June. Support in exposed positions. Expect full bicolour at 100–120 days — from August, the mahogany-red and golden-yellow eclipse continues well into October.
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