Lack of proper fertilization will cause stunted growth in peace lilies. They don't require an exceptional amount of soil additives, but every so often, they need an extra bit of food. Using a fertilizer containing magnesium sulfate works well. Even diluting Epsom salts in water should get your peace lily back on track.
This article contains affiliate links, so we may earn a small commission when you make a purchase through links on our site at no additional cost to you.