A study reveals peat made up 58 per cent of compost sold in 2011. In 2012 it was 52 per cent.
Manufacturers bulked composts up with bark, coir, wood fibre and composted green waste as firms cut peat use to meet environmental targets.
The study was carried out for the Sustainable Growing Media Task Force.
A poor peat harvest in 2012 led to rising prices, and a lower peat content in many brands of compost.
However, a bumper peat harvest is expected this season. Industry sources say manufacturers are likely to respond to gardeners’ demands for more peat in compost.