For many vegetables, it's easy to save seed alongside harvesting your normal crop.

You don’t need a lot of specialist knowledge to start saving seeds - it can be as easy as drying a handful of beans at the end of the summer. However, some vegetables are easier than others, and if you want to be really successful there are a few simple principles to bear in mind.

• Why save seed?
• Why not just buy it?
• Why grow these weird types of vegetables?