Today I am experimenting with making a small tunnel out of 50mm poly pipe. The ends of the pipe just fit onto wooden pegs, which are (hopefully) a tight enough fit to stop the pipe coming off easily. A bit of bracing along the top to stop it all moving about, and there you go. Only enough plastic for half of it, but with any luck I’ll be able to rustle some more up and get it finished so that we can start off the baby plants in it.