We have 2 of these at work that have both turned a bright red. They are beafsteak begonias.I stuck them outside in the sun because they had mealies and I figured the plant would just burn up and die and then I could throw it out. Both have turned this bright red colour. They almost look like they came from that planet from the beginning of the new Star Trek movie ;). I'm going to assume this new colour is from direct sun and possibly a lack of nutrients? However if it lost that much nutrients I'd think the plant would be dead. Anyone have any guess?