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Blossom-End Rot on Container Tomatoes: Calcium and Water Fixes

Black bottom rot = blossom-end rot from uneven watering and/or calcium deficiency.

Fixes

Water deeply 1–2x/week; never let dry out completely.
Add crushed eggshells to soil.
Spray 1 tbsp Epsom salt/gal water weekly (magnesium aids calcium uptake).
Mulch heavily.
At planting: 1–2 tbsp Epsom salt in hole.

Self-corrects by late summer as roots mature.

Growing Vegetables: Watering Tomatoes in Clay Pots: Avoid Blossom End Rot; Tomato Black Spots: Calcium Deficiency, Soil pH, and Organic Remedies; Black Bottom Tomatoes in Buckets: Drainage and Watering Fixes; Comprehensive Tomato Watering and Nutrition Fix; Using Epsom Salts on Tomatoes: Frequency and City Water Concerns; Comprehensive Guide to Fixing Yellow Tomato Leaves in Containers; Treating Tomato Leaf Spot with Copper Fungicide; Drooping Container Tomatoes: Rootbound and Water Fixes; Tomato Plants Dying from Bottom Up: Water and Disease Fixes; Complete Guide to Blossom‑End Rot: Prevention, Treatment, and Soil Health

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