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Blossom‑End Rot in Container Tomatoes: Epsom Salts, Mulch, and Watering

Cause in Pots

Containers dry unevenly → calcium uptake fails. Potting mix may lack magnesium.

Fixes

Epsom salts: 2 Tbsp in planting hole; 1 Tbsp/gal foliar spray at flowering.
Mulch 3" straw/grass clippings.
Water deeply every 3 days (adjust for rain). Never at night.
Crushed Tums in soil for quick calcium.
Fertilize low‑N, high‑P/K every 2 weeks max.

Organic Soil Approach

Amend potting mix with compost, manure, peat. Feed mid‑season with fish emulsion or kelp.

Growing Vegetables: Tomatoes All Leaves, No Fruit? Wrong Fertilizer Ratio Is the Problem; Indoor Tomato Flowering: Fixing Nutrient Imbalance; Container Tomato Success: One Plant Per Pot, Proper Soil, and Support; Why Tomato Leaves Shrivel and Blooms Drop: Diagnosing the Problem; Container Tomato Troubles: Overwatering, Overfertilizing, and Root Bound Solutions; Tomato Leaf Curl and Decline: Over‑Fertilizing, Overwatering, and Root Bound; Container Tomatoes in North Texas: Bigger Fruit, Less Blossom‑End Rot; Greenhouse Container Growing: Sanitation, Irrigation, and Design Tips; Growing Tomatoes: Complete Guide for a Bountiful Harvest; Growing Tomatoes in Cinder Blocks: A Clever Container Method

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