Phosphorus Does NOT Promote Flowering There is little evidence that phosphorus promotes flowering. Bloom boosters are not needed, nor do they do help your plants, unless you have a phosphorus or potassium deficiency in the soil. The only way to know this, is with a soil test.

What is the best fertilizer to make flowers bloom?

To stimulate blooming, choose fertilizers with a higher percentage of phosphorus compared to the percentage of nitrogen and potassium. Healthy flowers start with vigorous root systems, and a potassium boost can ensure your flowers get a good start.

What happens if a plant has too much phosphorus?

The buildup of phosphorus in lawns, gardens, pastures and croplands can cause plants to grow poorly and even die. Excessive soil phosphorus reduces the plant’s ability to take up required micronutrients, particularly iron and zinc, even when soil tests show there are adequate amounts of those nutrients in the soil.