Fertilizing Tomatoes with 10-10-10: Rates and Timing

At planting, use just 1 teaspoon of 10-10-10 per plant, mixed into the soil. When fruit sets, apply 3 tablespoons per plant in a ring 6 inches from the stem. Repeat every 4-6 weeks through the season.

Always water after fertilizing. Avoid high-nitrogen fertilizers after fruit set, which promote foliage over fruit.