How much fertilizer you need in a year for African violets?

This is dependent on how many African Violet plants you are growing and their stage of growth. African violets should be fertilized during their flowering period. Mine flower in the late fall through to spring. After they stop flowering, I continue to water them once a week, but leave out the fertilizer. Growing 4 plants in my home, I have used one 10 ounce bottle of African Violet fertilizer in one year's time.