From a royal debut in Norfolk to a river of dahlias in Brabant, here’s what’s left on the 2026 flower calendar

If the first half of 2026 belonged to spring — cherry blossom in Taipei, tulips in Lisse, the big spring showcases in Philadelphia and London — the second half belongs to something looser and more varied: royal debuts, harvest festivals, giant vegetables, and floats built entirely from dahlias. Here’s what’s still ahead on the world’s flower calendar, and what to expect from each.

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RHS Sandringham Flower Show: A Royal Estate Opens Its Gates (22–26 July)

The most significant structural change to hit British horticulture in years is playing out right now. In 2024, the RHS announced it was overhauling its flower show calendar: RHS Hampton Court Palace Garden Festival, long a summer fixture, would become a biennial event, and RHS Flower Show Tatton Park would shift to once every three years. In their place, the RHS began touring its shows to new locations — Wentworth Woodhouse in 2025, and in 2026, two entirely new venues: Badminton Estate in Gloucestershire (which ran July 8–12) and, for the very first time, Sandringham Estate in Norfolk, running July 22–26.

Sandringham is the private country retreat of King Charles III and Queen Camilla, and the show’s centerpiece reflects that directly: the RHS Royal Legacy Garden, designed by Catherine MacDonald of Landform Consultants in direct consultation with the King himself. Early previews describe a garden built around fractals and the branching patterns found in nature, with sinuous paths threading through a biodiverse mix of trees and perennials, planted with many of His Majesty’s own favorite species and a bold, personal color scheme. It’s paired with a run of Long Borders mentored by Chelsea design veteran Tom Hoblyn, and a series of Show Gardens built specifically to celebrate Norfolk’s landscapes and forward-thinking horticultural practice.

Beyond the headline garden, the show carries all the usual RHS staples reworked for a royal country setting: a Floral Marquee packed with more than 50 specialist growers and nurseries, a Flower School turning out elaborate floristry tablescapes and pedestals, a Summer Fruit and Vegetable Competition for junior growers, and a “Leaf Letters” activity in which children write messages to the King and Queen on hand-chosen leaves. Just up the road, at Badminton, the show that opened the RHS’s new touring format two weeks earlier delivered a genuine highlight in Jo Thompson’s Archers 75th Anniversary Garden — a scene-for-scene recreation of Bridge Farm, the fictional home at the heart of BBC Radio 4’s long-running rural drama, right down to welly boots sized for each generation of the show’s characters and packets of sweet pea seeds referencing a specific storyline. Tom Stuart-Smith’s Julia Rausing Garden, at 2,400 square meters, was reportedly the largest show garden the RHS has ever staged. Together, Badminton and Sandringham mark the real test of whether the RHS’s new touring model can replicate the loyalty Hampton Court and Tatton Park built up over decades — early reviews suggest it’s off to a strong start.

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Feria de las Flores: Medellín’s Ten-Day Flower Festival (31 July – 9 August)

Just as Sandringham wraps up, Colombia’s biggest annual celebration gets underway. Feria de las Flores, Medellín’s flagship festival, runs its 69th edition from July 31 through August 9 — ten days of concerts, classic car parades, farmers’ markets, and Antioquian folk music (trova) across more than thirty locations and over a hundred public events citywide.

Everything builds toward the festival’s closing set piece: the Desfile de Silleteros, on the final Sunday. Flower farmers from Santa Elena, the mountain community above the city, carry elaborate floral arrangements called silletas strapped to their backs — some standing over three meters tall and weighing as much as 80 kilograms, built over months using dozens of flower varieties and depicting everything from Colombian landscapes to cultural symbols. This year’s parade is set to include more than 500 silleteros of all ages, including dedicated categories for children and participants with disabilities, walking a roughly 2.4-kilometer route through the city center to Plaza Mayor, where the floral monuments remain on public display for several days afterward. It is, by most measures, the single largest showcase of hand-carried floral craft anywhere in the world — a direct descendant of the region’s flower-growing economy rather than a garden-design exercise, which gives it a very different texture from the RHS shows or Keukenhof.

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Southport Flower Show: The UK’s Biggest Independent Show at Its Seasonal Peak (20–23 August)

Back in England, late August belongs to Southport, which bills itself as the UK’s largest independent flower show and has run at Victoria Park since 1924. Unlike the RHS shows, there are no members-only preview days — the show opens to everyone across all four days, drawing more than 55,000 visitors.

The late-August timing is deliberate: it sits in the gap after the summer planting rush and before the autumn clear-up, meaning perennials and annuals are at their absolute seasonal peak and the Grand Floral Marquee is at its most saturated with color. New for 2026 is “The Lakeside Reset,” a redesigned water-feature area intended as a calmer counterpoint to an otherwise busy showground. The competitive classes — cut flowers, pot plants, specialist grower exhibits — are judged by midday each day, with ribbons displayed from then on, and the Garden Theatre lineup this year opens with broadcaster and horticulturist Adam Frost, continuing Southport’s tradition of drawing serious gardening names alongside its family-day-out atmosphere.

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Bloemencorso Zundert: The World’s Largest Flower Parade Returns (6–7 September)

Back in the Netherlands, autumn opens with one of the most singular events on this list. Bloemencorso Zundert, held in the small North Brabant town on the first weekend of September, is built entirely around a single flower: the dahlia. Twenty neighborhood teams spend the whole year cultivating dahlia fields — around eight million blooms are used in total, some six million of them grown locally in Zundert itself — before shifting, in the final “Stick Week” before the parade, to attaching the flowers by hand onto enormous steel-and-papier-mâché float structures that can reach 19 meters long and 9 meters high.

The floats parade through town on Sunday afternoon, judged by an independent jury for the year’s best design, before a public exhibition day on Monday lets visitors get close enough to appreciate the sheer density of flowers involved — from a distance, the most accomplished floats are detailed enough that many visitors don’t immediately register that the entire surface is made of living dahlias rather than paint or fabric. Founded in 1936 and now recognized on the Netherlands’ national inventory of intangible cultural heritage, it remains, by most accounts, the largest flower parade anywhere in the world, and one built entirely by volunteers rather than professional exhibitors.

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Malvern Autumn Show: The UK’s Biggest Harvest Celebration (25–27 September)

Closing out the season proper, the Malvern Autumn Show returns to Three Counties Showground in Worcestershire for its 30th-plus edition, positioning itself less as a flower show in the Chelsea mold and more as a full harvest festival. Alongside RHS floral displays and more than a hundred “Grow to Show” competitive classes for cut flowers, succulents, fruit, and vegetables, the show’s best-known fixture is the CANNA UK National Giant Vegetables Championship, where competitive growers chase Guinness World Records titles with marrows, giant green beans, super-sized sunflowers, and the show’s perennial headline act, enormous pumpkins.

It’s a fitting bookend to a flower-show year that, across every continent, kept circling back to the same idea: gardens and growers responding to season, place, and community rather than working against them. Malvern’s giant vegetables and Zundert’s dahlia floats sit at one end of that spectrum, built from months of unglamorous cultivation; Sandringham’s royal borders and Southport’s peak-season marquees sit at the other. Between them, they cover most of what a flower lover could want from an autumn.

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Worth Watching For

A few additional dates for anyone tracking the wider calendar: regional chrysanthemum and dahlia society shows run right through October and into November across the UK (Bishop Auckland’s long-running Late Chrysanthemum Show typically falls in early November), and — as ever with outdoor events on this scale — most of these shows remain genuinely weather-dependent. Given how volatile 2026 has already proven for UK growers, with a wet, record-warm June following a deluge-heavy January, don’t be surprised if late-summer and autumn show reports include as much discussion of irrigation and heat-stressed bedding plants as of the blooms themselves.