How to Grow Calendula
'Touch of Red' from Seed
The calendula with a dark secret — warm burnished orange from a distance, but the underside of every petal is brushed with deep mahogany-red that flashes into view as the flower tracks the sun and closes at dusk, creating a living, shifting two-tone display with a vintage, antique quality unlike any other pot marigold
Stand at a distance from a planting of 'Touch of Red' and you see warm, burnished orange — a richer, moodier tone than the vivid tangerine of standard marigolds, but still clearly in the orange family. Move closer and the picture changes: the underside of every petal is brushed with deep mahogany-red, a dark, velvety tone that in good light appears almost wine-dark. As the flowers track the sun through the day and begin to close at dusk — revealing the abaxial surface — this dark reverse becomes increasingly visible, and the border shifts from warm amber to something altogether more complex and dramatic. At twilight, the plants glow with a quality that can genuinely be called beautiful in an unusual, moody way.
The colour palette of 'Touch of Red' is not one single combination but a whole spectrum within the variety — individual plants produce flowers in yellow, apricot, and orange, each petal tipped or suffused with that crimson-mahogany on the underside. The overall effect across a group of plants is that of a vintage tapestry rather than a bright announcement. It is the calendula for gardeners who love the plant's easy-going reliability but find the conventional orange palette too straightforward — the calendula that works with dark-leaved dahlias, bronze fennel, deep-hued sweet peas, and the burgundy tones of 'Chioggia' beet foliage in a kitchen garden with sophisticated colour ambitions.
Quick Facts at a Glance
Plant Type
Hardy Annual (H3)
Sowing Time
Sep (preferred) · Apr–May direct
Flowering
May/Jun – October
Position
Full sun; lean, well-drained soil
Height
40–50cm
Difficulty Rating
1 out of 5 — Very Easy
Understanding the Plant
'Touch of Red' is Calendula officinalis — the same species as all pot marigolds — bred for the specific concentration of mahogany-red anthocyanin pigment on the abaxial (underside) surface of each petal. Like the Sherbet Fizz reverse-petal mechanism, the two-tone quality of 'Touch of Red' depends on viewing angle: the upper surface of the petals displays the orange-apricot-yellow tones; the reverse shows the deep mahogany-red. The difference from Sherbet Fizz is the warmer, richer palette — where Sherbet Fizz shimmers between buff-cream and wine-red, Touch of Red operates between burnished orange and dark mahogany, a darker, more saturated, more dramatic set of tones.
The Mechanism — How the Two-Tone Works
The dark red colour on the reverse of each petal is produced by anthocyanin pigments concentrated specifically on the abaxial (underside) surface of the petal cells. The adaxial (upper) surface contains primarily the orange carotenoids characteristic of pot marigolds. As the flower tracks the sun (heliotropism) and the flower head tilts at different angles through the day, alternately more of the upper or lower petal surface becomes visible to an observer at a fixed viewpoint — the flower appears to change colour as you watch it. At dusk, when the flowers close by folding the petals inward (nyctinasty), the lower surface is fully exposed and the whole planting appears to shift from orange to a deep, smouldering mahogany-red.
Dark Foliage Companions
The dark mahogany-red in 'Touch of Red' creates the best pairings with plants that share or amplify its darker tones. Bronze Fennel's smoky purple fronds pick up the mahogany exactly, creating a sophisticated fire-palette combination. Dark-leaved dahlias — burgundy or near-black — provide the same tonal resonance. Deep-coloured sweet peas in crimson or plum, or the rich purple of Red Drumhead cabbage in a kitchen garden setting, all intensify and complement the two-tone effect rather than clashing with it.
When & How to Sow
'Touch of Red' follows the same sowing approach as all calendulas — direct sow at 1cm depth (darkness required), thin to 30cm, deadhead consistently. Autumn sowing produces the earliest, strongest plants.
Full Sun for Maximum Colour Saturation
The mahogany-red pigment in 'Touch of Red' is most intensely developed and most richly saturated in full sun. In partial shade, the dark tones remain present but appear less vivid and the overall colour appears flatter. The two-tone shimmer effect — the shift from orange to mahogany as viewing angle changes — is most dramatic when the flowers are in direct sun, where the contrast between the two surfaces is greatest.
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Sow directly at 1cm depth — cover well. Darkness triggers germination; uncovered seed produces poor results. Sow September for May flowers, or April–May for July flowers. Germination takes 7–10 days at 10–20°C.
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Thin to 30cm apart. The bushy, mounded habit requires adequate space for full expression. Crowded plants produce drawn stems with fewer flowers and a less saturated two-tone effect.
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Deadhead every spent head promptly. The essential calendula rule. Remove every fading flower before the curved seed case forms. With consistent deadheading, 'Touch of Red' flowers from May to October; without it, the season may be only three to four weeks.
Growing On & Care
Evening is Spectacular
The dusk display of 'Touch of Red' is its most dramatic — as the flowers close in the fading light, they fold the mahogany undersides outward and the planting transforms from its daytime orange to a smouldering, wine-dark display that glows in the low evening light. Position plants where they can be seen from a seating area or kitchen window in the late afternoon and early evening. This is a plant that is at its most beautiful when viewed from a specific direction at a specific time.
Lean Soil
As with all calendulas, 'Touch of Red' performs best in average to lean soil without additional fertiliser. Rich soil produces excessive leaf growth and dilutes the intensity of the mahogany-red pigmentation. The most vivid two-tone effect develops in plants grown in conditions closer to the plant's Mediterranean natural habitat — lean, well-drained, sun-baked ground.
Edible Dark Petals
The two-tone petals of 'Touch of Red' are fully edible — a mild, slightly peppery flavour, as with all calendulas. The individual petals, with their orange upper face and mahogany-red underside, are extraordinary as a food garnish — scattered over a pale dessert or salad, they provide both colour and visual complexity. The dark-tipped effect is most visible on pale backgrounds.
Cut Flowers
Harvest stems in the morning when flowers are freshly opened. The two-tone quality reads beautifully in a vase — seen from different angles as the arrangement shifts, the flowers appear to change colour. Condition in cool water for several hours. Particularly effective in arrangements combining dark dahlias, bronze fennel, and deep-coloured sweet peas.
Self-Seeding
Allow a few late-season heads to ripen and self-seed. Self-seeded offspring from 'Touch of Red' generally maintain the two-tone character, though there is some variation in the depth of the mahogany — some offspring may show lighter or more uniform orange. For consistent mahogany depth, fresh seed each season produces the most reliable results.
Sticky Stems
As with all calendulas, the stems and seed cases of 'Touch of Red' are resinous and sticky. The orange pollen can stain pale fabric. Handle over a hard surface rather than light upholstery when deadheading or cutting. Wash hands after handling quantities of cut stems.
When to Expect Flowers
From a September sowing, 'Touch of Red' flowers from May or early June. From an April or May spring sowing, from late June. The full display with consistent deadheading runs through to October. The two-tone effect is most dramatic in the cooler, brighter light of May–June and September, when lower sun angles catch the petal reverses more readily than at the high-noon sun of July and August.
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| 🌿 Spring Sow |
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| 🌸 Flowering |
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Common Problems & Solutions
| Problem | Likely Cause | What to Do |
|---|---|---|
| Flowers more orange than mahogany | Viewing angle; partial shade; rich soil | The mahogany-red is on the underside — view from below or at eye level as flowers begin to close. In partial shade, pigment intensity reduces. Grow in full sun in lean soil. The colour is most dramatic in the evening as flowers close, not at midday when they are fully open. |
| Flowering season short | Deadheading neglected | Remove every spent head before seed sets. Even a week's lapse significantly shortens the season. Consistent deadheading is the difference between three weeks and five months of flowering. |
| Pale, washed-out colour | Overrich soil; over-feeding | Avoid fertiliser at planting time. Grow in average to lean soil. The most vivid mahogany tones develop in plants experiencing slight nutrient constraint — the same condition that produces the best colour in most ornamental plants. |
Plant Specifications
The calendula that keeps a dark secret — and reveals it at dusk
'Touch of Red' is the calendula for gardeners who have always wanted more from the genus than cheerful orange — the burnished, mahogany-touched variety that works with dark dahlias, bronze fennel and burgundy foliage in a border scheme of depth and sophistication. Sow in September, position to be seen in evening light, deadhead consistently, and discover the performance that happens as the light fades and the flowers begin to close. This is vintage pot marigold at its most mysterious and most rewarding.
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