Defra secretary Hilary Benn will use his visit to the Royal Botanic Gardens Kew to launch the Act on CO2 Peat campaign.
The campaign is targeting amateur gardeners as they buy the majority of peat (70%) that is used in horticulture.
Hilary Benn was set to announce new targets to reduce peat in compost in the amateur gardening market.
Kew Gardens director Professor Stephen Hopper is to join Benn in a tour of the gardens, which have been peat-free since 1992.
Benn's visit will take in the Kew Diploma students' vegetable plots, the Rock Garden, Davies Alpine House and the Princess of Wales Conservatory.
He will also be joining school children from the local Broomfield Primary school in a plant-potting lesson using peat-free compost.
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