What happens next?

How to keep your plant nursery clean
Give your nursery a thorough cleaning before winter.
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. Disease organisms also survive the winter in greenhouses, only to attack with a vengeance when the temperatures warm back up.