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Blossom-End Rot on Tomatoes: Classic Calcium/Water Fix

Brown bottoms = blossom-end rot from uneven water or low calcium.

Standard Remedy

Deep water 1–2x/week (1.5" total).
Crushed eggshells in soil.
Epsom salt spray (1 tbsp/gal) weekly.
Heavy mulch.
Planting hole: 1–2 tbsp Epsom salt.

Most US soils low in calcium; consistent moisture unlocks it.

Growing Vegetables: Mold on Indoor Plant Soil: Why Repotting Is the Best Cure; Fixing Blossom-End Rot on Tomatoes: Causes and Solutions; Blossom-End Rot in Square Foot Tomatoes; Blossom-End Rot on Tomatoes and Peppers: Mid-Season Fix; Thin-Walled Peppers and Tomato Cross-Pollination Facts; Squash Blossom End Rot: Pollination and Water Management; Blossom-End Rot on Tomatoes: Causes, Prevention, and Calcium Management; Container Tomato Troubles: Overwatering, Overfertilizing, and Root Bound Solutions; Composting Tomato Plants: When It's Safe and How to Do It Right; Composting Tomato Plants: When It's Safe and How to Do It Right

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