Stop greenhouse mould

Q Determined not to heat our greenhouse this winter, we spent a long time insulating the inside before putting back tender plants and cuttings. How can we get rid of the fuzzy mould infecting some plants and what will happen if we have a very cold winter? Geoffrey Mills, Louth, Lincolnshire

A Insulating a greenhouse usually consists of fixing bubble plastic to the inside using pins or clips. It is also possible to fit a false ceiling or create a smaller section. This is a fiddly task and you need to make sure it is still possible to open the vents. To prevent fungal botrytis (grey mould) from growing on your plants the golden rules are adequate spacing, as much ventilation as you dare give and removing every dead leaf, stem and petal. Grey mould often starts on dead plant tissue, but under cool humid conditions will move onto soft growth.

I stopped insulating our greenhouse many years ago, as I wanted to reduce plastic use. I hated fixing it, wanted to let in maximum light and air, and didn’t enjoy seeing my plants encased in its milky film. Good winter light is vital because during mild spells plants will try to make growth. Panes should be cleaned on a warm, dry, autumn day.