Recognize blossom-end rot

Blossom-end rot usually appears as a discolored patch at the blossom end of a tomato, opposite the stem. The affected area can become dark, sunken, and leathery as the fruit develops. It is a physiological disorder rather than an infection passed from one tomato to another.

Other damage can look similar, so inspect the position and pattern of the lesion. If the symptoms are unusual or accompanied by widespread leaf and stem damage, seek a crop diagnosis before assuming every affected fruit has the same problem.

Leave room for the crop at its mature size, with access for watering and harvest. Compare garden bed sizes →

Understand why calcium may not reach the fruit

Developing fruit needs calcium delivered through the plant. A soil can contain calcium while the fruit receives too little. Fluctuating moisture, root stress, and unsuitable growing conditions can interfere with uptake and movement.

This is why immediately adding eggshells or another calcium source is not a dependable response. Crushed shells break down slowly, and a bed with adequate calcium still needs stable watering and healthy roots. A soil test is a better basis for deciding whether an amendment is necessary.

Check how the whole root zone is watered

Do not judge moisture only by the surface. Check below it at several points, particularly if one emitter or hose position serves a large plant. Adjust irrigation so water reaches the roots without keeping the bed continuously saturated.

Raised beds can dry at different rates according to their medium, depth, exposure, and the soil beneath them. Use those observations to set a routine. A fixed number of waterings per week cannot account for every heatwave or rainfall event.

Reduce avoidable root stress

Use mulch appropriately to reduce rapid surface drying, keeping it clear of the stem. Avoid deep cultivation close to established tomato roots. Make sure water has somewhere to drain, and check that a crowded planting is not making inspection and watering difficult.

Review fertilizer use. Excess nitrogen can encourage growth that the plant struggles to support, so follow a soil-based feeding plan rather than repeatedly feeding a stressed crop. Do not add lime solely because a fruit has a damaged bottom; liming also changes pH and should be justified by a test.

Manage damaged fruit and protect the next set

An existing damaged patch will not heal. Remove badly affected fruit as appropriate and focus on conditions for subsequent fruit. A calcium spray should not become a substitute for correcting moisture and root problems.

Keep watching the next fruit set after changes are made. Improvement takes time, and a fruit already developing under stressful conditions may still show damage. Record watering changes and weather so you can recognize the pattern in future seasons.

Make prevention part of the planting plan

Before the next crop, prepare a workable root zone, confirm irrigation coverage, and provide enough space for the mature plant. Choose varieties suited to the local season and transplant without unnecessary root disturbance.

The practical goal is consistency: roots that can function, moisture that does not swing sharply, and nutrients supplied according to need. A taller or more expensive bed cannot replace those basics.