Why do pomegranate fruits split?
Pomegranates may split when expanding arils and the skin’s ability to stretch become unbalanced. Changes in water availability near ripening are particularly relevant, but different kinds of damage can produce different cracks.
Reading the timing and appearance of cracks
1. Increased water after a dry period A pomegranate’s skin develops around its juicy arils. If a prolonged dry period is followed by heavy rain or excessive irrigation, growth inside the fruit may exceed the skin’s capacity to accommodate it. This does not mean that withholding water throughout the season prevents splitting. Compare irrigation records, rainfall dates and the first appearance of cracks. That sequence is more informative than blaming whichever watering happened most recently. Root-zone conditions before the rain matter as well. 2. Cultivar and maturity differences Pomegranate cultivars differ in skin characteristics, ripening season and susceptibility to splitting. Different cultivars in the same garden should not all be expected to become ready for picking on one day. Colour alone is an inadequate maturity test: combine the known cultivar’s harvest season with fruit development and local growing records. Leaving mature fruit on the tree unnecessarily can increase its exposure to autumn rain. A young tree’s first few fruits do not reliably represent the long-term performance of the entire cultivar. 3. Sunburn and physical injuries Brown, hardened or sunken skin on the exposed side may initially indicate sunburn. Cracks can subsequently develop in weakened areas. Bird pecks, rubbing branches and impacts during harvest leave other starting points. Photograph whether cracks look fresh or darkened and whether they consistently face the same direction. Rot entering an existing opening does not establish that a fungal infection caused the original split. Distinguishing the first injury from secondary deterioration helps make prevention more precise.
Practical ways to reduce future losses
4. More even root-zone moisture Assess moisture where roots are growing, rather than judging only the soil surface. Soil texture and drainage matter: a sandy soil and a heavy clay soil require different watering schedules. Check that emitters work and that irrigation reaches the expanding root zone. Organic mulch may reduce moisture fluctuations, but keep it away from the trunk. A container-grown pomegranate has a restricted root volume and can dry rapidly; leaving its pot standing in a saucer of water is not an appropriate solution either. 5. Restraint with fertiliser and pruning Applying calcium or boron indiscriminately to every tree with split fruit is not a diagnostic method. Suspected nutritional problems need soil testing and correctly timed leaf analysis; excess boron can itself be harmful. Avoid encouraging unbalanced growth with excessive nitrogen. Severe pruning that opens the canopy abruptly can expose previously shaded fruit to strong sunlight. Cultivar, tree age, crop load and local temperatures should all inform management, rather than assuming that one fertiliser programme fits every orchard. 6. Harvest and records for next season A split skin will not join together again. Harvesting sound mature fruit gently and at the appropriate stage, and removing rotting fruit from the tree, can limit further losses. Do not eat mouldy or deteriorated fruit. Record the proportion of split fruit alongside irrigation and rainfall for each cultivar. Repeated severe losses warrant a discussion with a local horticultural adviser about cultivar suitability and watering. One unusual season does not by itself justify replacing all trees or applying a pesticide.