- When a tree is carrying a very heavy crop, the fruits are often small and of poor quality.
Pears: Can be prone to over-bearing but usually need less thinning; thin clusters to two fruits (one for a small cordon), 10-15 cm (4-6in) apart.
Peaches and nectarines: Thin peaches to one every 10cm (4in) when the size of a hazelnut, then again to one every 20-25cm (8-10in) when the size of a walnut. Thin nectarines to 15cm (6in) at walnut size.
Apricots: Are less prone to over-bearing; thin only if the crop is excessively heavy, to 5-8cm (2-3in) apart when hazelnut sized.
(Courtesy of the RHS)