All fruits and vegetables can be preserved by canning.

The principles are to halt ripening, and prevent the growth of fungi and bacteria on the food. They are preserved by drying, canning, irradiating and freezing.

Most fruits or vegetables can be processed by canning, freezing, or drying.

Theo Thomas has written:

'Canning fruits and tomatoes' -- subject(s): Preservation, Canning and preserving, Fruit, Tomatoes

'Canning vegetables' -- subject(s): Vegetables, Canning and preserving, Preservation

There are lots of food products that contain preservatives: nearly everything manufactured or processed has preservatives in them.

Raw fruit and vegetables and fresh-caught fish have no preservatives. Butchers can sell you meats without preservatives.