One in five Brits think parsnips grow on trees

The same amount (20 per cent) think that melons grow in the soil, according to the poll of 2,000 adults.

Nearly a third confessed that they have no idea how some of the most basic fruit and vegetables grow, with 10 per cent saying tomatoes have to be dug up.

A quarter of adults (25 per cent) are regularly foxed when kids ask them where certain foods come from, the research for Potato Week found.

A fifth have never heard of a King Edward or a Maris Piper, but just one in 20 feel completely embarrassed by their lack of knowledge.

Other common blunders include naming a Granny Smith as a variety of potato (5 per cent). 

http://www.telegraph.co.uk/foodanddrink/foodanddrinknews/9582261/One-in-five-Brits-think-parsnips-grow-on-trees.html