[header] How to keep your plant nursery clean [title] Give your nursery a thorough cleaning before winter. [step] Keeping the nursery or greenhouse clean works well as a defense against plant diseases and insect infestations. Begin with a thorough cleaning of the entire nursery in the fall. 
The growing season is over at that time, the weather is beginning to cool and insects are looking for a warm home for the winter. [substeps] Disease organisms also survive the winter in greenhouses, only to attack with a vengeance when the temperatures warm back up.