Tomato Blossom-End Rot: Caused by Water Fluctuation

Black, sunken bottoms on tomatoes are blossom-end rot, a calcium deficiency triggered by irregular watering.

The Mechanism

During hot, dry spells, the plant diverts water from fruit to survival. Calcium (moved only in water stream) doesn't reach the developing tomato bottom, causing tissue collapse.

Prevention

• Water deeply and consistently—same time, same amount daily.
• Mulch 3″ to stabilize soil moisture.
• Avoid high-nitrogen fertilizers (excess foliage worsens demand).
• Soil test: ensure calcium is adequate (gypsum if low).

Steady water = perfect bottoms.