Made from a woven poly plastic that is very durable and can be stapled together.
Tunnels need to be big enough to work in comfortably and to encourage air movement.
It is designed in two sections to allow rain water into the centre of the tunnel.
Tunnels will protect plants from light frosts and stimulate growth of winter seedlings (you can see here carrots and spring onions that were planted mid summer). We are now planting cabbage, lettuce, silverbeet, kale white onions, celery, broad beans, broccoli and fennel.
Growing seasonally, most of these things are biennials or perennials. Shade cloth and tunnels help to extend their season.