Why Are My Cherry Tree Leaves Turning Yellow?

Yellow leaves on a cherry tree are one of the most common signs that something is wrong, yet the cause can range from a harmless autumn cycle to a serious root problem that needs urgent attention. Because cherry trees are vigorous when healthy, widespread yellowing mid-season is never something to ignore. The pattern and timing of the colour change are your two most important diagnostic clues.

Nitrogen deficiency — general pale fade

A slow fade from rich green to pale yellow-green, starting on the oldest leaves at the base of shoots and working toward the tips, is the textbook sign of nitrogen shortage. Cherry trees growing in grass suffer most because lawn grasses are aggressive nitrogen competitors. Rake away any turf in a circle around the trunk extending to the drip line, and apply a balanced fruit-tree fertiliser in late winter or very early spring. Do not feed with high-nitrogen products in summer — soft late growth is vulnerable to frost and disease.

Iron chlorosis — yellow blade, green veins

When the area between the leaf veins turns yellow while the veins themselves stay green, you are looking at interveinal chlorosis, almost always caused by iron or manganese being locked up in alkaline soil. Cherry trees are sensitive to high pH and suffer this problem more readily than many other stone fruits. Test your soil — if pH is above 7, apply chelated iron as a foliar spray or soil drench, and work towards long-term acidification using sulphur chips dug into the root zone each autumn.

Waterlogging

Cherry tree roots need air as much as they need water. In persistently wet or compacted soil the roots suffocate, nutrient uptake collapses and the canopy turns progressively yellow regardless of how much fertiliser you apply. If the ground stays soggy for days after rain, drainage is the priority. Improve the soil structure with grit and organic matter, install a drainage channel around the root zone, or in extreme cases accept that a replacement tree on a mounded, free-draining site may be necessary.

Magnesium deficiency after wet summers

Magnesium is easily leached from light soils during wet weather. The deficiency shows as yellowing between the veins of mid-canopy leaves later in summer, often with a reddish or orange tint. A foliar spray of Epsom salts (magnesium sulphate) at 200 g per 10 litres, applied twice in summer six weeks apart, corrects it quickly.

Natural autumn yellowing

Cherry trees are deciduous and turn yellow before leaf drop in autumn. If yellowing begins in September and progresses evenly across the tree as temperatures cool, this is normal seasonal senescence rather than a problem. The leaves will fall cleanly and the tree will perform well the following spring, assuming it was otherwise healthy through the growing season.

Disease-related yellowing

Bacterial canker, cherry leaf spot and silver leaf disease can all cause premature yellowing. If yellowing is accompanied by brown spots, dark-edged lesions, a silvery sheen on the leaf surface or weeping bark, a disease problem is likely compounding or causing the discolouration. Address the disease first — feeding a diseased tree rarely reverses the symptoms.