hi - this site is new to me so i hope i am posting in the right place. i bought a dieffenbachia this spring. it had some very small leafy growth in the same pot. i left it. it has become apparent that it's a zebrina plant. it looks pretty in the pot but i'm worried that it's not good for the overall welfare of dieff. the dieff. is looking just fine. the new growth is large and beautiful although as new leaves come in the bottom leaf is yellowing at the edges. i know the zebrina is a good groundcover. i'm just not sure if it's good for a potted plant??? any help appreciated....thanks...sam