For more than a century, a stand at the RHS Chelsea Flower Show has been the horticultural equivalent of a knighthood — the ultimate mark of prestige for Britain’s growers, nurseries and garden designers. But in 2026, that prestige is starting to look like a burden. A growing number of exhibitors are pulling out, being turned away, or publicly protesting the Royal Horticultural Society’s peat-free policy, exposing a rift between the show’s environmental ambitions and the realities of the supply chain that keeps it blooming.

A Policy Years in the Making

The RHS first pledged in 2021 that all plants at its shows would be “No New Peat” — either fully peat-free or grown in peat extracted before the end of 2025 — by the time that deadline arrived. It’s part of a wider environmental push: peatlands cover just 3% of the Earth’s surface but store more carbon than all the world’s forests combined, and in the UK an estimated 75% of them are degraded, meaning they now emit carbon rather than lock it away. The RHS made its retail operations peat-free in January 2026 and has spent over a decade and roughly £2.5 million funding peat-free research and workshops for hundreds of nurseries.

But government follow-through never materialised. A planned retail peat ban collapsed with a change of government, and a promised ban on peat for commercial growers has stalled too. Facing what director general Clare Matterson called a “legislative black hole,” the RHS softened its own rules earlier this year, allowing up to 40% of nurseries in the Great Pavilion to sell “peat starter plants” — plants begun in peat plugs and then grown on peat-free — until 2028.

Growers Say the Rules Don’t Work in Practice

Even with those concessions, the policy has proven a headache for the trade. Growers supplying show gardens have told the trade press that fully tracing a plant’s peat history is close to impossible unless it has spent its entire life with a single grower on a single nursery — a rare occurrence given how international and layered modern plant supply chains have become, with much young stock imported from abroad.

That friction has already cost Chelsea some of its regulars. Contract grower Creepers Nursery announced it would take a year off from growing for the show, and at least one other nursery has withdrawn altogether, citing the strain of complying with the traceability demands. Longstanding grower Kelways has also publicly questioned whether the policy is workable as written.

A Very Public Protest

The dispute spilled into full public view this year when award-winning exhibitor Tim Penrose said the RHS had refused him a stand because he hadn’t attended the society’s anti-peat seminars and wasn’t seen as sufficiently committed to the policy. Penrose didn’t take the rejection quietly — he showed up to Chelsea in a Superman costume, suggesting only a superhero could save the show from itself, and used the moment to air his grievances over what he sees as a bureaucratic and unevenly applied rule.

Money Troubles in the Background

The peat row hasn’t happened in isolation. The RHS recorded a net loss of £8.1 million for the year to January 2025, even as it says more recent, unpublished figures look healthier, pointing to a 7% rise in income and a £4.8 million cash profit. The show has also lost major backers: an anonymous philanthropic couple who had reportedly put more than £23 million into Chelsea over the years ended their support this year, and a rival event, backed by The Newt in Somerset, has launched with free entry for under-16s — a direct, if polite, challenge to Chelsea’s dominance of the show calendar.

Critics inside the industry have gone further, arguing the peat dispute is a symptom of a broader drift. Some designers and writers have accused the RHS of being slow to modernise on several fronts at once — organic growing, gender representation among top garden designers, and now sustainable materials — while continuing to showcase elaborate, corporate-sponsored show gardens whose own carbon footprints have drawn criticism.

Where It Leaves Chelsea

None of this means Chelsea is going peat-free smoothly, or that it’s falling apart. The RHS points to genuine progress: all show gardens, judged floral displays and trade stands at its 2026 shows are required to be “No New Peat,” and the society continues to fund research into alternatives. But the exhibitor departures and public friction suggest the transition is proving far messier than the tidy deadlines first announced in 2021.

For an institution whose identity is built on horticultural excellence and tradition, the peat question has become an unusually public test of how far the RHS can push its own membership toward sustainability before some of them simply walk away.