Here are a few reasons why your Amaryllis may not be producing flowers: Using the wrong plant food. fertilizers high in nitrogen help with leaf production but do not help flowers develop. Use a plant food high in Potassium. Your Amaryllis may not be getting enough light or the temperature may be too cold. The soil is too wet. If you dig up Amaryllis bulbs too early once the flowers fade; the plant may not bloom the following year.