Shop Cactus Potting Mix Gro Pro Heavy Duty Black Saucer 14 in Colocasia esculenta Big Dipper In this slow cooker French onion beef recipe, chuck steak is slowly cooked in red wine, with sweet carrots, fresh thyme and, of course, the flavour bomb that is French onion soup Am I overwatering these? Leaves are yellowing a bit. I also tore out a couple of tomato plants that had black spots appearing on them. White mold and algae have also appeared.