Complete Guide to Blossom‑End Rot: Prevention, Treatment, and Soil Health

What Is Blossom‑End Rot (BER)?

Black, soft bottom on tomatoes (peppers, eggplant too). Caused by calcium uptake failure due to:

• Irregular watering (containers especially).
• Soil pH imbalance.
• Root stress (heat, compaction).

Prevention Plan

1. Epsom salts: 1–2 Tbsp in planting hole; 1 Tbsp/gal foliar spray at flowering.
2. Mulch 3" straw/grass clippings — conserves moisture, cools roots.
3. Watering: Deep, every 3 days (adjust for rain). Never at night. Target 1.5"/week.
4. Fertilizer: Low‑N, high‑P/K every 2 weeks max. Tomato‑specific formulas.
5. Quick fix: Crush Tums into soil around plant.

Organic Soil Strategy (Long‑Term)

Amend annually with compost, shredded leaves, aged manure, peat moss. Feeds steadily, balances pH, suppresses disease. Mid‑season boost: fish emulsion or sea kelp.

Edibility

Fruit is safe if rot hasn't passed midpoint. Cut off affected part.