The Flowers of Chelsea 2026: A Florist Guide

RHS Chelsea Flower Show, 19–23 May 2026 — 113th Edition

Every May, the grounds of the Royal Hospital Chelsea transform into the most closely watched garden in the world. The 2026 edition — the show's 113th — sees around 145,000 visitors descend on SW3 to take in 18 show gardens, 21 container, balcony and houseplant exhibits, and the spectacular Great Pavilion, where nurseries and growers compete for medals with displays of extraordinary floristry and botanical artistry. This year's overarching theme is "Out of this World," and the planting palette is nothing short of dazzling — shaped by a warm spring, a collective hunger for colour, and an increasingly serious conversation about sustainability and climate resilience.

What follows is a plant-by-plant guide to the flowers dominating Chelsea 2026: what they are, where they're appearing, why they matter, and how you might grow them yourself.

Delphiniums: The Undisputed Star of 2026

If one flower defines Chelsea 2026, it is the delphinium. Towering, architectural and impossibly blue, delphiniums are having a moment that goes well beyond the show grounds. They were named Flower of the Year 2026 by leading floral retailers months before Chelsea opened its gates — described as representing "hope, elevation, and the steady movement toward brighter days" — and their prominence at the show has emphatically confirmed that status.

The connection to the Royal Family gives the plant an extra layer of significance this year. Delphiniums are famously one of King Charles III's favourite flowers, and they feature prominently throughout The RHS and The King's Foundation Curious Garden, designed by Frances Tophill. Most remarkably, this garden showcases the extremely rare Delphinium elatum 'Alice Artindale', a historic double-flowered variety of which only a handful of plants are known to exist anywhere in the world. Its inclusion is a statement about conservation as much as beauty.

Across the showground and in the Great Pavilion, delphiniums appear in their classic blues and purples, but also in soft pinks, creamy whites and rich violet-mauves. Designer Jamie Butterworth singled them out as one of the defining features of this year's colour story, alongside lupins and bright bulbs — a palette energised by the warmth of the preceding spring.

Growing notes: Delphiniums are herbaceous perennials hardy in the UK. They prefer a sunny, sheltered spot with rich, well-drained soil. Tall varieties must be staked — they can reach six feet — and benefit from deadheading after the first flush to encourage a second bloom in late summer. They resent waterlogging in winter and thrive in the slightly alkaline soils common in southern England.

Alliums: Chelsea's Reliable Purple Cloud

Alliums — the ornamental onions — are arguably the most dependably present flower at any Chelsea show, and 2026 is no different. They flower naturally in May without needing greenhouse forcing, which makes them a designer's best friend in the context of a show that demands peak performance on opening day.

The variety Allium 'Purple Rain' has been particularly noted this year, earning almost affectionate commentary from visiting gardeners and journalists. Its rich purple spherical flowerheads float on slender stems above the border, creating that characteristic airy, dot-of-colour effect that naturalistic designers prize. Alliums work beautifully in the interstitial spaces of a planting scheme — filling the gap between spring tulips (which are going over by late May) and the full flush of summer perennials.

This year, alliums appear in naturalistic schemes throughout the show gardens, particularly in the gardens that lean into the "rewilding" and meadow aesthetic that has become a defining movement in British garden design. Their seedheads, which persist long after the flowers fade, add structural interest well into autumn, making them exceptional value in any planting.

Growing notes: Plant allium bulbs in autumn, 10–15cm deep in free-draining soil. They tolerate most conditions but dislike heavy, waterlogged clay. Their foliage, which appears before the flowers, can look untidy as it dies back — the trick is to plant them among perennials whose leaves will conceal the browning straps. Divide clumps every few years to maintain vigour.

Iris Germanica: Bold, Bearded and Back in Fashion

The bearded iris (Iris germanica) is experiencing a significant resurgence at Chelsea 2026, driven by a renewed appetite for saturated colour and old-fashioned cottage-garden drama. Jamie Butterworth, one of the show's most closely watched commentators, specifically cited Iris germanicas as "very popular this year — the reds and the oranges," pointing to a shift away from the traditional blue and purple palette that dominated the flower for decades.

This colour evolution is striking. Where bearded irises at Chelsea once appeared almost exclusively in soft lavenders, whites and mauves, 2026 sees rich terracotta-reds, burnt orange, copper and deep burgundy commanding attention. These warmer tones resonate with the broader garden design tendency this year towards earthy, sun-drenched colour palettes inspired by Mediterranean and Middle Eastern landscapes.

Irises suffered somewhat in the May showers that struck before the show opened — irises are notoriously intolerant of rain on their petals, which can cause browning — but those that made it through unscathed are among the most arresting individual plants on the showground.

Growing notes: Bearded irises require excellent drainage and at least six hours of direct sun daily. The rhizomes must be planted shallowly — half in, half out of the soil — and must never be buried, or they rot. Divide clumps every three to four years immediately after flowering, replanting the outer, vigorous sections and discarding the old centre. They are drought-tolerant once established.

Roses: Perennial Royalty

No Chelsea would be complete without roses, and 2026 maintains the tradition splendidly. David Austin Roses, the Shropshire nursery synonymous with English roses, brings a new release to this year's Great Pavilion. Roses appear throughout the show gardens in climbing, shrub and standard forms, woven through naturalistic planting with a more relaxed hand than in shows past.

The RHS and The King's Foundation Curious Garden features roses named in honour of both the King and Alan Titchmarsh, alongside its delphiniums and cottage-garden perennials. This gives roses a symbolic as well as horticultural role in one of the most talked-about gardens of 2026.

New rose varieties showcased at Chelsea traditionally go on to become bestsellers in subsequent seasons; the show functions as a launchpad for the nursery trade in a way no other UK event can match. This year, breeders have brought forward varieties with improved disease resistance — particularly against blackspot and rose rust — reflecting the show's increasing engagement with climate-adaptive, lower-input gardening.

Growing notes: Roses are more forgiving than their reputation suggests. Plant in full sun with rich, moisture-retentive soil, feed generously in spring and again after the first flush, prune to outward-facing buds in late winter, and deadhead regularly. Many modern varieties are disease-resistant enough to require no spraying at all.

Ranunculus: The Rose of Spring Makes Its Comeback

One of the more exciting talking points before the show opened was the push by Flowers from the Farm — a collective of British cut-flower growers — to rehabilitate the ranunculus and correct its undeserved reputation as a difficult plant. Their Chelsea presence championed the ranunculus as the "Rose of Spring": the flower that fills florists' buckets while the actual roses catch up.

Ranunculus (Ranunculus asiaticus and its cultivars) produces extraordinarily full, tissue-paper-layered blooms in every shade from pure white through cream, yellow, coral, blush, deep red and near-black. The blooms have a sculptural quality — they look almost handmade — that has made them enormously popular in wedding and event floristry. Their Chelsea moment in 2026 should drive significant interest from gardeners who have previously assumed they were too tricky for home growing.

Growing notes: The "claws" (corms) are planted in autumn in free-draining soil, or in spring after the last frost. They need cool temperatures to establish and dislike waterlogging above all else. A useful trick if corms are slow to sprout: soak overnight in cool water, then pre-sprout in a tray of light compost before planting out. In wetter gardens, growing in pots with gritty compost is often more reliable.

Lupins: Bold Verticals in the Colour Story

Lupins are among the other plants that show commentators have identified as dominant in the 2026 palette. Their candle-like spires of densely packed flowers in pinks, purples, whites, bicolours and deep blues complement the vertical presence of delphiniums while adding a somewhat looser, slightly wilder texture. In naturalistic schemes — which are a major trend at this year's show — lupins work as a bridge between the formal and the wild.

They are particularly effective in the cottage-garden-influenced planting that runs through multiple 2026 exhibits, where their bold colour and architectural form add energy to what might otherwise become overly gentle schemes.

Growing notes: Lupins are short-lived perennials that are at their best in their second and third year. They prefer free-draining, slightly acidic soil and full sun or light shade. Deadhead promptly to encourage further flowering and to prevent excessive self-seeding. They are not fans of heavy clay or prolonged drought.

Salvias: The Workhorse of Colour

Salvias are omnipresent at Chelsea 2026, with Jamie Butterworth noting "salvias galore" as a defining characteristic of this year's planting schemes. The genus has exploded in popularity over the past decade as designers have discovered its extraordinary breadth — from the hardy Salvia nemorosa varieties that perform reliably in the British climate to the tender South American species that deliver spectacular late-season colour in shades of scarlet, cerise, violet and indigo.

This year, salvias appear both in cottage-garden-style planting and in more architectural, contemporary schemes where their long flowering season and pollinator appeal make them indispensable. The 2025 Chelsea Plant of the Year featured a salvia (Salvia Tropicolour Sunrise as a co-winner), reflecting the genus's enduring hold on the horticultural world's imagination.

Growing notes: Hardy salvias (S. nemorosa, S. × sylvestris) can be cut back hard after the first flush to encourage repeat flowering. Tender salvias should be overwintered under glass or treated as annuals. Most prefer full sun and well-drained soil; they are notably drought-tolerant once established, making them excellent choices for climate-resilient planting.

Nepeta: The Indispensable Blue Edge

Nepeta — catmint — is cited alongside salvias as one of the defining plants of the 2026 show by those who have walked the gardens. It is easy to see why: nepeta's soft, hazy lavender-blue flowers and grey-green foliage provide a visual glue between bolder planting, softening transitions and filling the foreground of borders with billowing, fragrant colour.

In the naturalistic planting that dominates many of this year's show gardens, nepeta functions as the essence of effortlessness — the plant that looks as though it has always been there, as though the garden grew itself. Nepeta 'Six Hills Giant' and the smaller N. 'Walker's Low' are among the most commonly used varieties.

Growing notes: Nepeta is one of the easiest garden plants there is. Plant in well-drained soil in full sun or partial shade, and cut back hard after the first flush in June for a generous second blooming in late summer. It is reliably hardy, drought-tolerant once established, and irresistible to bees and butterflies.

Geums: Pops of Warm Colour

Geums are emerging as a key accent plant at 2026 — warm-toned jewels in the border, with their saucer-shaped flowers in coral, orange, scarlet, yellow and apricot rising on wiry stems above ground-hugging rosettes of leaves. They bring the heat tones that are a recurring note in this year's palette and provide colour at a height and scale that bridges the gap between ground-level planting and the taller perennials behind.

In combination with delphiniums and irises, geums create the kind of layered, richly coloured cottage-garden tapestry that multiple Chelsea 2026 designers have reached for in their schemes.

Growing notes: Geums prefer moisture-retentive but well-drained soil and do best in full sun to light shade. They are reliably hardy and relatively easy to grow from seed, though named varieties are best propagated by division. Deadhead regularly to prolong flowering from late spring through early summer.

Ornamental Grasses: Movement and Texture

While not flowering plants in the conventional sense, ornamental grasses are a major structural and textural presence at Chelsea 2026, and their role in the wider planting conversation deserves acknowledgement. Miscanthus, calamagrostis and sesleria are all prominent, praised by show commentators for bringing movement, resilience and a naturalistic quality to schemes that might otherwise feel static.

The choice of grasses also reflects the climate-adaptability conversation running through the show: these are plants that cope with both summer drought and winter wet, that look good across multiple seasons, and that require minimal intervention once established. In the context of a show increasingly focused on environmental responsibility, their prominence is pointed.

Amelanchier and Hornbeam: Structural Trees in Show Gardens

The headline-sponsored Range Rover Cloister garden, designed by Alexandra Noble, uses Amelanchier trees for height and seasonal interest alongside hornbeam columns as architectural elements. Though primarily structural rather than floral, Amelanchier's spring blossom — white, star-shaped and profuse — has genuine floral impact and it is worth noting as a recommended small garden tree that produces both spring flowers and autumn colour.

The Colour Story of 2026

Taken together, the flowers of Chelsea 2026 tell a distinct colour story: one of optimism and warmth. Multi-award-winning designer Sarah Eberle observed that "there is more colour" this year, suggesting that people feel a need for cheering up. The palette runs from the cool, hopeful blues of delphiniums and nepeta through the purple haze of alliums and salvias to the hot accents of orange and red irises, geums and certain roses — a full-spectrum response to uncertain times.

The warm spring that preceded the show brought many plants to peak bloom simultaneously, creating an abundance that energised designers and gave the show a particularly vivid quality. For visitors and home gardeners alike, the message from Chelsea 2026 is clear: be bold, plant generously, and trust that colour, used with intelligence and care, never goes out of style.

Key Gardens to Note for Plant Inspiration

The RHS and The King's Foundation Curious Garden (designer: Frances Tophill) — Cottage garden planting with rare delphiniums, roses, herbs and pollinator plants. The plant to seek out: Delphinium elatum 'Alice Artindale'.

The Campaign to Protect Rural England: 'On The Edge' (designer: Sarah Eberle) — Naturalistic planting that showcases how wildflower-influenced schemes work in a designed context.

Parkinson's UK: A Garden for Every Parkinson's Journey (designer: Arit Anderson) — One of the most emotionally resonant gardens of the show, with planting chosen for sensory richness and accessibility.

The Tate Britain Garden (designer: Tom Stuart-Smith) — Sophisticated, naturalistic planting that demonstrates how the biggest names in garden design are moving away from highly controlled schemes toward something more fluid and plant-led.

The Plant Heritage Missing Collector Garden — Not a show garden in the conventional sense, but an important exhibit in the 'All About Plants' category, shining a light on rare and endangered plant genera at risk of disappearing from cultivation altogether.

The Chelsea Flower Show runs 19–23 May 2026 at the Royal Hospital Chelsea, London SW3. The public plant sell-off takes place from 4pm on Saturday 23 May.