Build a greenhouse from 2litre clear pop bottles and bamboo poles.
Lots of 2 l bottles (save lids to make a collage)
Bamboo poles to thread them on
Wood to construct frame
Scissors, Nails, hammers
remove labels and cut bottoms off bottles (Beavers)
Build wooden frame (Scouts)
Saw/cut poles to right lenghts for frame (Cubs)
Thread bottles on to poles to form continuous tube, facing last bottle in opposite direction to keep them in place.
Fix bottle poles into frame close enough to prevent draughts.
If making full size greenhouse, don't forget a door.
For cloche or smaller, a removeable panel will suffice.
Full plan can be found online.
Allow at least 2 meetings.