Ground tubes are the foundation of your polytunnel. It is the ground tubes which are fixed directly into the earth and it is the ground tubes to which your polytunnel hoops are connected.
If you want to give your polytunnel extra resistance you may want to concrete your ground tubes into the ground, for this you will need a concreting bar (order one per tube, ground tubes are pre-drilled for the bar to fit).
Ground tubes are the foundation of your polytunnel. It is the ground tubes which are fixed directly into the earth and it is the ground tubes to which your polytunnel hoops are connected.
If you want to give your polytunnel extra resistance you may want to concrete your ground tubes into the ground, for this you will need a concreting bar (order one per tube, ground tubes are pre-drilled for the bar to fit).