Two South Holland schools won £300 of gardening vouchers after impressing in a composting challenge.
It was part of a project Anglian Water’s Keep It Clear programme has been running with Lincolnshire Community and Voluntary Service (LCVS) called Fat of the Land.
The aim was to grow awareness of the problems caused by food waste, fats, oils and grease blocking sewer pipes.
Each of the 12 groups that took part received a HOTBIN composting bin for their growing projects and a total of 600 giant pumpkin seeds.
St Bartholomew’s Primary School, in West Pinchbeck, won the best growing project in a school.
St John’s Primary School in Spalding won the prize for the biggest school pumpkin (39 inches circumference). The school’s Katy Llewellyn said: “We had a crop of at least 15 pumpkins in our pumpkin patch – the children were so proud.”