To show you just how easy it is to grow crops in a small space, the RHS has set up 3x3m (10x10ft) plots at its gardens.
These small areas show that everyone can grow their own veg and fruit at home - so go on, have a go yourself.
RHS Garden Harlow Carr
RHS Garden Hyde Hall
Hyde Hall made four veg plots, showing different types of vegetables and growing techniques.
RHS Garden Rosemoor
RHS Garden Wisley
Wisley produced two veg plots - one with typical British vegetables and the other with Oriental vegetables.