Posted: 04/07/2014 at 18:01
Bolting means that a plant that is grown for its leaves, like a lettuce, puts up a flowering stalk. It usually means that the plant is unusable.
Of course, almost all plants will flower, but we've developed our vegetable varieties to delay this so that we can eat the leaves.
However, if a plant is subjected to stress, e.g. lack of water, or if it's sown at the wrong time of the year, it will try to flower sooner than we want it to.
Hope that's clear - if not please say