Heat, nitrate curbs halt Jersey sea lettuce growth
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- Jersey's Environment Department confirmed that no sea lettuce has been collected from St Aubin's Bay so far in 2026, citing "disrupted normal growth" from a combination of heat, dry weather, and reduced farm runoff.
- Record May temperatures peaked at 29.2C (84.5F) — Jersey's hottest May day on record — and persisted through the window when sea lettuce normally reproduces, a spokesperson said.
- The Action for Cleaner Water group, a joint initiative of Jersey Water, the government, and farming representatives, has cut nitrate fertiliser use on fields, reducing the nutrient runoff that normally fuels the algae.
- Prolonged dry weather, starting earlier than in previous years, was identified by officials as an additional contributing factor.
- In 2025, crews removed nearly 3,000 square metres (32,300 sq ft) of sea lettuce from the beach and repurposed it onto island fields — a stark contrast to this year's total absence.
Why it matters: Jersey beachgoers who routinely endured foul-smelling sea lettuce blooms get a reprieve this summer, but the shift shows how the island's nitrate-reduction farming policies and warming climate are now visibly suppressing the algae. The 2025 removal of nearly 3,000 sq m underscores how abruptly the beach's annual cycle has flipped from nuisance to none.
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