Algae, liverworts and moss on greenhouses

Green growths such as algae, liverworts and moss can accumulate on the glazing and surfaces of greenhouses, where they are unsightly and cut out light. They can be controlled by improving hygiene and ventilation.

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Algae and moss in a greenhouse. Credit: RHS Advisory

Quick facts

Common name Algae, liverwort, moss
Areas affected Greenhouse glazing and other surfaces
Main causes Damp conditions, poor ventilation
Timing Noticed more in winter, but can be seen after any wet spell

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