How much peat in a peat bog?
17 January 2014 Last updated at 10:24 GMT
For many years Britain's gardeners have been asked to stop using peat, but the message is still not getting through, according to the Royal Horticultural Society.
More than half of compost sold still contains peat. Peat bogs are important for the natural environment and store more carbon than forests, reducing climate change.
Alasdair Brock, from Natural England, is working to restore Wedholme Flow near Carlisle, a peat bog which was badly damaged by years of peat extraction.