Fertilizing for More Flowers: Decoding the Numbers for Maximum Blooms

The Fertilizer Formula for Flowers

Every fertilizer label shows three numbers (N-P-K): Nitrogen (leaf growth), Phosphorus (flowers, fruit, roots), Potassium (overall vigor). To boost blooms, choose a product with low nitrogen, high phosphorus, moderate potassium—e.g., 5-30-5.

Why Lawn Fertilizer Harms Flowers

Lawn food is high-N (e.g., 26-3-3) and often contains broadleaf herbicides. Ornamentals are broadleaf plants—lawn fertilizer can kill them.

Summer Feeding Strategy

Growth slows in heat, but plants set next year’s flower buds. Apply bloom-booster (liquid preferred—absorbs via roots and leaves). Hose-end sprayers work if you dilute 1:1 and clean the screen frequently.

Golden Rule

"Not enough is always better than too much." Over-fertilizing burns roots, reduces flowering, and pollutes waterways. A phosphorus-rich, low-nitrogen feed applied correctly yields noticeably more blooms.