10 Popular Houseplants That Are Poisonous To Cats And Dogs Small form vs large form Monstera Deliciosa. Both plants are juvenile. You can easily distinguish the two by petiole length vs sheath length. But as they grow the small form will have Monstera vermehren: Anleitung fr Fensterblatt Ableger Monstera deliciosa var sierrana New leaves turning brown! It keeps sprouting new leaves (yay!) but none of them seem viable. They turn brown black and crispy at the tips, don't uncurl, and seem to wilt rot from the Gummibaum blht nach 40 Jahren