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The circulation of fresh air in an enclosed environment.

A traditional structure for the storage of vegetables. A clamp consists of a pile of the vegetables, layered with straw and soil to protect it from frost and rain. Ventilation holes are plugged with loose straw to prevent the build-up of carbon

A fungal plant disease that causes a powdery coating on the surfaces of affected plants. Commonly occurs where plants have been exposed to damp conditions. It can be prevented by having good ventilation.

Regularly water crops in pots and growing bags, daily if needed in warm weather Plant trailing tomatoes in hanging basketsFeed young plants weekly with a solution of liquid fertiliserVentilate the greenhouse during the day, but close vents

to supportsIncrease shading and ventilation to keep temperatures down on hot daysTake cuttings from hydrangeas, fuchsias, pelargoniums, osteospermums, marguerites, coleus and verbena

cover to continue cropping over winterVentilate the greenhouse on warm daysLine the glass with bubble polythene for insulationPropagate perennials from root cuttings including phlox, rhus and mintPlant bulbs in large pots of compost ready to fill any

Plant hippeastrum bulbs for spring displaysInsulate your greenhouse with bubble polythene for insulationVentilate greenhouses on warm, dry daysUse rainwater to keep the compost of potted azaleas constantly moistCheck fuel levels in paraffin and gas

to reduce the spread of diseaseCheck dahlia tubers and bulbs in store for signs of rotPick off fading or diseased leaves from pelargoniums and other plantsContinue ventilating the greenhouse on warm daysCut down chrysanthemums after floweringPrune dormant

and out to let in more lightTake root cuttings of perennials including phlox and oriental poppiesPlant hippeastrum bulbsUse rainwater to keep the compost of potted azaleas constantly moistVentilate greenhouses on warm, dry days

Learn how to reinvigorate your citrus plants by watching Monty prune back woody growth and refresh compost. Follow his advice on watering citrus plants and providing them with the correct balance of ventilation and protection from the cold