Anyone had this in flower?

Looks like the start of mold. If one or more of your plants have been strongly affected by gray mold, it’s time to cut your losses and remove the entire plant before it spreads to the other ones. Take out every bit of the plant and place it in a sealed plastic bag before throwing it away. Don’t add them to your compost pile, as that would cause the gray mold to spread back to your plants with ease. If only part of the plant is affected, you can attempt the pruning route — remove all the leaves and buds that have been affected, and then sterilize the pruners you used with rubbing alcohol or peroxide. Another way to treat plants affected by gray mold is to apply a copper sulfate and slaked line bordeaux mixture. Plenty of gardeners and farmers use this to prevent their non-marijuana plants from contracting gray mold, especially in vineyards. Otherwise try using copper soap or spray, which is harmless to the harvest and can be used from day one of your plants’ lives. Spray it on them every week or week and a half. Another option is to utilize sulfur burners or sprays so that the treatment isn’t just sitting on the plant, but also works through the air. One thing to note is that you shouldn’t use fungicide of any sort if your plants are budding, and don’t spray the buds with neem oil or burn sulfur during the flowering phase. If your buds end up tasting terrible, then all is lost in any case — and that’s what spraying them with these products will do. Hope this helps! 👊