The harvest is the fruit of a huge push in March, when growers helped 14,500 schools plant potatoes as part of the scheme to improve eating habits.
Gloucester grower Graham Nichols, Newbury District and Agricultural Society, and HW gardening writer Peter Seabrook helped 200 pupils in Berkshire weigh out Rocket and Vales Emerald.
"I never tire of seeing the anticipation from the children as they dig out their bags," said Nichols, who also worked with society education officer Jan Murray.
"It is important we continue to nurture this interest to ensure potatoes remain in demand in the future," he added. Nichols is one of several "potato ambassadors" who visit schools from Portsmouth to Liverpool.
Potato Council marketing administrator Sue Lawton said: "The project is simple and good fun, which means the messages learnt by the children should endure."