How to Grow
Sweet Pea 'Swan Lake' from Seed
The exhibitor's and florist's pure white sweet pea — Hardy Annual H3; RHS AGM; Spencer type; solid, creamy-dense pure white petals (not papery or translucent); clean, fresh fragrance — not overpowering; perfect for dining tables near food; the palate cleanser that breaks up hot colours and reflects moonlight; vigorous; sow Oct–Nov (best) cold frame or Jan–Mar at 15°C; TOXICITY: all parts mildly toxic
Sweet Pea 'Swan Lake' is the pure white Spencer sweet pea that goes with absolutely everything — a quality that reflects the specific design value of pure white in the garden and in the vase. As a Spencer type with the RHS Award of Garden Merit, Swan Lake meets the exhibition standard: large, ruffled, waved petals in a solid, creamy-dense white (not papery or translucent) on long, straight stems. As a cut flower, the white works with every coloured companion. As a garden plant, it provides the palate-cleanser contrast that makes vivid colours around it appear more vivid.
The specific quality that distinguishes Swan Lake from other white sweet peas is the moderation of its fragrance: clean, fresh and sweet, but not the room-dominating intensity of heavily-scented varieties. For dining table displays, for arrangements near food, for vases in spaces where food aromas should not be competed with, Swan Lake provides the aesthetic quality of a fragrant sweet pea without the aromatic dominance that can make heavily-perfumed varieties impractical in domestic settings. The scent is present, pleasant, and appropriate — exactly what a white sweet pea for every occasion should be.
Quick Facts at a Glance
Plant Type
Hardy Annual H3 — Spencer type; RHS AGM; the exhibitor's and florist's pure white sweet pea
Colour
Pure white with solid, creamy-dense petals; not papery or translucent — a true swan white
Fragrance
Clean, fresh, sweet — not overpowering; perfect for dining tables near food
RHS AGM
Award of Garden Merit — confirmed reliability, vigour and flower quality for UK gardens
TOXICITY
All parts mildly toxic — do not eat; keep away from children and pets
Difficulty
2 out of 5 — same care as all Spencer sweet peas; the white colour makes everything easier
Understanding Swan Lake
Toxicity Warning — All Parts Mildly Toxic
Sweet pea seeds and all parts of the plant are mildly toxic if ingested. They must not be eaten and should not be mistaken for edible garden peas, which they closely resemble in seed form. Keep seeds and plants away from children and pets.
Sowing — Deep Pots or Root Trainers; Autumn or Spring
Sow in root trainers or deep pots (minimum 10cm depth) at 1cm depth — never in shallow cell trays. Autumn sowing (October–November in a cold frame) produces the strongest plants, deepest root systems, and earliest flowers from May. Spring sowing (January–March) at approximately 15°C; avoid higher temperatures which inhibit germination. Germination 10–21 days. Soak seeds in tepid water for a few hours before sowing; nick any that do not swell.
Pure White with Solid Density — Not Papery
Swan Lake is not just any white sweet pea: it occupies a specific position within the white and cream sweet pea spectrum. Unlike some whites which can look translucent or papery, Swan Lake has a solid, creamy density to the petals. This solid quality — the way the petals hold and reflect light with substance rather than appearing thin or washed-out — is what distinguishes Swan Lake as the white sweet pea that works in exhibitions (where judges can assess the density and form of the petals up close) and in the vase (where the white holds at distance rather than disappearing into the background).
The Palate Cleanser — What White Does in the Garden
Swan Lake acts as a 'palate cleanser' in the garden — breaking up hot colours and reflecting the moonlight in the evening. A wigwam of white Swan Lake between bold warm-coloured sweet peas (crimson Winston Churchill, deep purple Pimpernell, coral Edith Flanagan) provides visual rest — the white gives the eye the contrast point that makes the surrounding vivid colours appear more saturated and more distinct from each other. In the evening garden, the white petals catch and reflect moonlight and ambient light, making the plant visible and luminous long after coloured sweet peas have become invisible against the darkening garden.
Pinch, Pick, Feed, and Mulch — The Four Essentials
Pinch out the growing tip at 4 pairs of leaves for bushy multi-stemmed growth. The Golden Rule: pick every 2–3 days and remove all seed pods without exception — a plant that sets seed stops producing flowers. Feed fortnightly with high-potash fertiliser (tomato feed) from first buds. Water at the base; mulch generously to keep roots cool through summer.
Sowing & Growing On
Sow Oct–Nov (best) or Jan–Mar at 15°C — Root Trainers — 1cm Deep — Soak First — Plant Mar–Apr — 1.8m+ Support — Pick Every 2–3 Days
Sow in root trainers at 1cm after soaking. Best: October–November in a cold frame for May flowers. Spring: January–March at 15°C. Plant March–April in rich deep soil with 1.8m+ support. Pinch at 4 pairs. Pick every 2–3 days.
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Sow in root trainers at 1cm depth after soaking seeds for a few hours; nick any that do not swell. Autumn sowing (October–November, cold frame) for May flowers and the strongest plants. Spring sowing January–March at approximately 15°C — avoid heat above 18°C which inhibits germination. Germination 10–21 days.
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Grow on in cool, bright conditions; plant out into deeply-prepared, generously-manured soil. Do not allow plants to become rootbound in pots before planting. March–April for autumn sowings; April–May for spring sowings. Erect support structures before or at planting — trellis, wigwam of canes, or netting at least 1.8m tall.
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Pinch out at 4 pairs of leaves (approximately 10cm) for bushy multi-stemmed growth. Guide the climbing stems to the support structure regularly. Water at the base; mulch to insulate roots against summer heat. Feed fortnightly with high-potash fertiliser from the first flower buds.
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Pick every 2–3 days without exception; remove all seed pods as soon as seen. This is the single most important action for a long sweet pea season. Regular picking is both the reward and the management requirement simultaneously.
Growing On & Care
The Exhibitor's and Florist's White
Swan Lake is a favourite of exhibitors and florists alike — reflecting the specific qualities that both groups require: consistent, solid white petals that maintain their colour from the first day of opening to the last; long, straight Spencer stems bearing multiple well-placed blooms; and the density and substance of the petals that allows close inspection at the show bench without revealing papery thinness or translucency. For exhibitors, Swan Lake provides the white class with dependable quality; for florists and domestic arrangers, it provides long white stems that work with any colour scheme.
Evening and Moonlight
The quality of white flowers at night is one of the most valued but least discussed qualities in garden design. In the evening garden, white sweet peas like Swan Lake catch and hold ambient light — from the last of the dusk, from the moon, from nearby lighting — in a way that coloured flowers entirely fail to do. The white petals reflect the moonlight in the evening. This quality makes white sweet peas valuable not only for daytime display but as a deliberate element of the evening garden, visible and luminous hours after red, purple, and blue sweet peas have disappeared into darkness.
The Dining Table Sweet Pea
Swan Lake carries a lovely, fresh scent — not overpowering, but clean and sweet, making it perfect for dining tables where you don't want the fragrance to dominate the food. This moderate, clean fragrance is a deliberate quality rather than a deficiency: where the powerful sweet pea fragrance of Leamington or Mollie Rilstone can fill and dominate a room, Swan Lake's fragrance adds a pleasant background note without competing with the aromas of food and drink. For table settings and dinner party displays, this specific quality makes Swan Lake the appropriate choice.
With Everything — The Versatile Companion
Swan Lake goes with absolutely everything in the vase. This is the specific design quality of pure white flowers: they provide the neutral reference point and the visual spacer that allows any other colour to sit beside it harmoniously. In a mixed sweet pea vase, white Swan Lake stems separate and clarify the coloured varieties around them — the crimson of Winston Churchill appears more vivid against white than against lavender; the coral of Edith Flanagan appears warmer; the purple of Pimpernell reads more deeply saturated.
RHS Award of Garden Merit
Swan Lake holds the RHS Award of Garden Merit, confirming its outstanding performance, vigour and flower quality in UK garden conditions. The AGM is awarded after independent multi-site garden trials conducted by RHS experts, and the citation specifically mentions "reliability and strength" alongside flower quality. For domestic growers, the AGM provides assurance that Swan Lake will perform consistently in UK conditions season after season without the variability that some white varieties can show.
Vigorous Climber
Swan Lake is known for its reliability and strength, quickly scrambling up arches or obelisks to provide a lush screen of green foliage topped with snowy blooms from mid-summer onwards. This vigour translates into a plant that establishes and covers its support structure quickly, producing the generous, continuous supply of cutting stems that the picking rule demands and rewards. For vertical coverage — an arch, an obelisk, a trellis fence panel — Swan Lake provides the white floral screen more quickly and more generously than less vigorous white varieties.
Sowing & Season Calendar
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
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| Autumn sow (Oct–Nov; root trainers; cold frame) |
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| Spring sow (Jan–Mar; cool 15°C; deep pots) |
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| Plant out (Mar–May depending on sow) |
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| Pick every 2–3 days (never allow pods) |
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Common Problems & Solutions
| Problem | Likely Cause | What to Do |
|---|---|---|
| Flowering stopping abruptly | Seed pods allowed to form | Strip all seed pods immediately. Resume picking every 2–3 days. Production resumes within a week. |
| Poor germination on spring sowing | Temperature too high; seeds old | Maintain 15°C. Nick seeds that do not swell. Use fresh seed each season. |
| Thin, weak stems; small flowers | Insufficient nutrition; rootbound before planting | Feed fortnightly from first buds. Prepare soil generously with manure or compost. |
| Powdery mildew in late summer | Normal late-season occurrence | Water at the base only; good air circulation; accept late-season mildew as normal for established plants. |
Plant Specifications
Pure white with solid density, fresh clean fragrance, and the versatility to go with absolutely everything in the vase and border
Sow in root trainers at 1cm after soaking seeds. Best: October–November in a cold frame for May flowers. Spring: January–March at 15°C. Plant March–April in rich deep soil with 1.8m+ support. Pinch at 4 pairs of leaves. Pick every 2–3 days without fail. Swan Lake's pure white and clean fragrance continue from May through September.
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