I Have Small Black Dots Stuck On My Greenhouse Walls(plastic). What Could They Be?

Question

They scrape off real easy. I just wanted to know if they could be harmful to my starts.

Answer 1

I would be concerned about mold. You can contact your local Cooperative Extension service for advice on whether that is harmful and how to remove it.

https://www.gardeningknowhow.com/special/greenhouses/greenhouse-gardening-supplies.htm

https://www.gardeningknowhow.com/special/greenhouses/is-greenhouse-humidity-important.htm

https://www.gardeningknowhow.com/garden-how-to/info/what-is-extension-service.htm