I had no idea about this

Fertilizing peony plants is crucial because it replenishes essential nutrients that the soil may lack. Over time, peonies deplete the soil of nutrients, particularly nitrogen, phosphorus, and potassium, which are vital for their growth and flowering. Fertilization supports robust root development, enhances flower production, and improves overall plant health. By providing the necessary nutrients, you ensure that your peonies have the energy to produce their characteristic large, vibrant blooms.