I'm in the process of moving my Christmas cactus and crocus to the new grow light shelving and I noticed that the crocus all have something on their leaves. They're small, white specs, don't move and are easily brushed off. Only the tray of crocus has them, There's nothing on the cactus, amaryllis, begonia, orchids or anything else.
I've move the flat outside fora while while I sort this out. (I need to remember to bring it back in!)
I can't take a picture as my camera is dead.
Anyone have any ideas?