LONDON — After a spring defined by cherry blossoms in Taipei, tulip fields in Lisse, and major showcases in Philadelphia and London, the second half of 2026 promises a more eclectic mix of royal garden debuts, harvest celebrations, giant vegetables, and floats constructed from millions of dahlias. Here is what remains on the international flower calendar and what visitors can expect.
RHS Sandringham Flower Show: Royal Collaboration Takes Center Stage
The most significant shift in British horticulture in recent years reaches a new milestone July 22–26 when the Royal Horticultural Society opens its first-ever flower show at Sandringham Estate, the private Norfolk retreat of King Charles III and Queen Camilla.
The show’s centerpiece, the RHS Royal Legacy Garden, designed by Catherine MacDonald of Landform Consultants in direct consultation with the monarch, features fractal-inspired pathways winding through biodiverse tree and perennial plantings. The garden incorporates many of the King’s favored species in a bold, personal color scheme. Early previews describe sinuous routes threading through native woodlands and carefully selected perennials.
Sandringham joins Badminton Estate in Gloucestershire, which hosted its debut RHS show July 8–12, as part of the society’s ambitious touring model. The restructuring, announced in 2024, reduced RHS Hampton Court Palace Garden Festival to biennial status and shifted RHS Flower Show Tatton Park to once every three years.
Badminton already delivered a standout attraction: Jo Thompson’s Archers 75th Anniversary Garden, a scene-by-scene recreation of Bridge Farm from BBC Radio 4’s long-running rural drama, complete with character-specific wellington boots and sweet pea seeds tied to a story line. Tom Stuart-Smith’s Julia Rausing Garden, at 2,400 square meters, has been described as the largest show garden the RHS has ever staged.
Sandringham’s offerings include a Floral Marquee with more than 50 specialist growers, a Flower School for elaborate floristry, a Summer Fruit and Vegetable Competition for junior growers, and a “Leaf Letters” activity where children write messages to the King and Queen on hand-selected leaves. Long Borders mentored by Chelsea design veteran Tom Hoblyn complement the show gardens celebrating Norfolk’s landscapes.
Feria de las Flores: Colombia’s Grand Floral Procession
As Sandringham concludes, Colombia’s largest annual celebration begins. Feria de las Flores in Medellín runs its 69th edition July 31 through August 9, featuring concerts, classic car parades, farmers’ markets, and traditional Antioquian folk music across more than 30 venues and 100 public events.
The festival builds toward its closing spectacle: the Desfile de Silleteros on the final Sunday. Flower farmers from Santa Elena, a mountain community above the city, carry elaborate floral arrangements called silletas strapped to their backs. Some silletas stand over three meters tall and weigh up to 80 kilograms, built over months using dozens of flower varieties depicting Colombian landscapes and cultural symbols.
This year’s parade expects more than 500 silleteros of all ages, including dedicated categories for children and participants with disabilities. They will walk a 2.4-kilometer route through the city center to Plaza Mayor, where floral monuments remain on public display for days. The event represents the largest hand-carried floral craft showcase globally, rooted in Antioquia’s flower-growing economy rather than formal garden design.
Southport Flower Show: Britain’s Largest Independent Show at Peak Season
August 20–23 brings the Southport Flower Show, which bills itself as the UK’s largest independent flower show, operating at Victoria Park since 1924. Unlike RHS shows, Southport offers no members-only preview days, opening to all visitors across four days and drawing more than 55,000 attendees.
The late-August timing is intentional, capturing the gap between summer planting and autumn cleanup when perennials and annuals reach their seasonal peak. The Grand Floral Marquee promises maximum color saturation.
New for 2026 is “The Lakeside Reset,” a redesigned water-feature area intended as a calming counterpoint to the bustling showground. Competitive classes for cut flowers, pot plants, and specialist grower exhibits are judged by midday each day, with ribbons displayed immediately. The Garden Theatre lineup opens with broadcaster and horticulturist Adam Frost, continuing Southport’s tradition of mixing serious gardening names with family-friendly atmosphere.
Bloemencorso Zundert: The World’s Largest Flower Parade Returns
September 6–7 marks the return of Bloemencorso Zundert in the small North Brabant town, an event built entirely around the dahlia. Twenty neighborhood teams spend the entire year cultivating dahlia fields, using approximately eight million blooms — six million grown locally in Zundert itself. During “Stick Week,” the final preparation period before the parade, volunteers attach flowers by hand onto enormous steel-and-papier-mâché float structures reaching 19 meters long and 9 meters high.
The floats parade through town Sunday afternoon, judged by an independent jury for the year’s best design. Monday’s public exhibition allows visitors to appreciate the density of flowers involved; from a distance, the most accomplished floats appear painted or fabric-covered rather than constructed from living dahlias.
Founded in 1936 and recognized on the Netherlands’ national inventory of intangible cultural heritage, the parade remains the world’s largest flower parade, built entirely by volunteers rather than professional exhibitors.
Malvern Autumn Show: The UK’s Biggest Harvest Celebration
September 25–27 closes the season properly at Malvern Autumn Show, returning to Three Counties Showground in Worcestershire for its 30th-plus edition. Positioned less as a formal flower show and more as a full harvest festival, the event features RHS floral displays alongside more than 100 “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 with marrows, giant green beans, super-sized sunflowers, and enormous pumpkins — the perennial headline act.
Worth Watching for the Remainder of 2026
Regional chrysanthemum and dahlia society shows continue through October and into November across the UK. Bishop Auckland’s long-running Late Chrysanthemum Show typically falls in early November.
Most outdoor events remain weather-dependent. Given 2026’s volatility for UK growers — a wet, record-warm June following a deluge-heavy January — late-summer and autumn show reports may include as much discussion of irrigation and heat-stressed bedding plants as the blooms themselves.
From Sandringham’s royal borders to Zundert’s dahlia floats, this year’s autumn calendar offers flower lovers a global tour of how gardens and growers respond to season, place, and community.