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Ventilation and shading 1416
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affected plants allow alpine house autumn bedding plants begonias bench benomyl buds bulbs cables chrysanthemums cloches cold frame cold greenhouse compost containers cool house corms cover crops cucumbers cyclamen damage damp develop drainage early fan heaters fertilizer flowering frost fruit fungicide garden germinate glass green greenhouse plants grown heated frame heaters heating system humidity installed John Innes Keep layer leaf leaves lettuce light liquid feed loam minimum temperature moist necessary nutrients orchids outdoors peat pelargoniums pests pests and diseases plant growth plantlets plastic pots plastic sheeting plunge polyethylene possible prevent Prick primulas propagating raised re-potting red spider mite remove rootball Saintpaulia sand seakale seedlings shading shoots softwood soil mix sown species spray spring staging stem sterilized summer surface Take cuttings thermostat tomatoes tubers vegetables ventilation wall warm greenhouse weather winter wire