Hello I have this mold-looking stuff in my greenhouse. I had this last year too and I have treated the soil with Basamid and diluted formol without any results. Can you offer any advice. Thanks, Andreea
Certified GKH Gardening Expert
This is common, and will come back on several occasions. This can be controlled, quite easily, with peroxide. Pour it directly on the areas, and it will resolve very quickly.