How do you keep the bubblewrap from going green? Is it anything to do with the ventilation and/or heating? We only have the peach tree in ours and so don't use insulation (the next door allotmenter has a magnificant peach tree in his huge leanto (part of an old pigsty!) and he told us to leave the peach to the frosts as they always vastly overproduce flowers! I recall my fathers greenhouse having bugs nesting between the bubbles-can this be prevented? Also -does it matter which side faces inwards?