How to Care for Peace Lilies

8. Fertilizing

If you are getting flowers but they are weak or green, it may be due to fertilizer. Green flowers can mean too much fertilizer, whereas weak flowers can mean that the plant needs fertilizer so that it can get more phosphorous. Peace lilies can grow fine without fertilizer for quite some time, and different people choose how often they prefer fertilization. Some fertilize every six weeks while others wait until the plant shows signs that it needs a bit of help. Especially if you fertilize often, take the plant outside or in the sink every six months or so and flush them with water to keep any salt from building up from fertilizing.