My Tomato Plant Is Looking Very Healthy but Not Blossoming Yet

Too Much Nitrogen

• Well-fertilized tomato plants may appear healthy but lack blooms. Fertilizers high in nitrogen cause plants to develop a profusion of foliage at the expense of blooms. According to the Planet Natural, tomato plants may fail to bloom altogether or drop blooms when exposed to excessive levels of nitrogen. Check your fertilizer's nitrogen content. The University of Missouri Extension recommends a low-nitrogen/high phosphorous 8-32-16 or 6-24-24 fertilizer, or look for a fertilizer made for feeding tomatoes.

  Check your fertilizer's nitrogen content. The University of Missouri Extension recommends a low-nitrogen/high phosphorous 8-32-16 or 6-24-24 fertilizer, or look for a fertilizer made for feeding tomatoes.

Too Little Nitrogen

• Too little nitrogen also causes problems. Tomato plants are heavy feeders requiring sufficient levels of nitrogen to grow and produce flowers. Make several applications of fertilizer during the life of your plants. While most of these applications should be timed to follow fruit set, apply an initial dose of fertilizer when first transplanting tomatoes into the garden. Amend poor soils before planting tomatoes. Poor drainage affects the plant's ability to utilize nutrients present in the soil.

Temperature

• Tomato plants may develop flower buds that drop before blooming when environmental conditions are extreme. Excessive temperatures causes the loss of flower buds in tomatoes, as can high or low humidity. When temperatures rise above 70 degrees overnight or 90 degrees during the day, tomato plants experience reduced flowering, according to the Virginia Cooperative Extension.

Water

• Too little water affects flower formation in tomato plants. Tomatoes require the equivalent of 1 to 2 inches of rain per week, applied by deeply soaking the soil. Inadequate watering causes the plants stress and delays flowering. Plants grown in sandy soils and on soil that drain quickly may require additional watering. If your soil drains too freely, the water in the soil may carry away vital nutrients as it drains.