Meanwhile outside London, 63% of children would rather eat fruit and vegetables they have grown themselves than buy them from a supermarket.
In response, The National Trust has created the Sowing Squad – a 13-strong team of young growers from across England, Wales and Northern Ireland – who want to help inspire the next generation to get planting.
Other findings revealed that topping the list of favourite vegetables for children was sweetcorn, followed by potatoes and carrots, all of which can be grown in the UK. Strawberries were top of the league table for most loved fruit but the poor Brussels sprout remains children's most hated vegetable.
Jenny Sansom, the local food coordinator, said: "Growing your own may be the secret to encouraging children to eat their greens, and not a naughty step in sight. Our research shows that, if given the space, the vast majority of children would love the chance to plant and nurture food they have grown from scratch.
"You don't need much space to get started and children are much more likely to try food they have planted and grown themselves. The whole family will benefit from the freshest and tastiest food possible, and it's great fun too, which is a real plus."
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