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Some have coarsely angled teeth so they cut on both push and pull strokes, but many cut only on the pull stroke.

Aug 18, Summer is the only time to prune plums, cherries, gages and damsons, because of their susceptibility to silverleaf disease. Fungal spores can enter through pruning cuts, but from fruiting until the end of August the spores are least active and wounds heal fastest. Make sure you use the best tools for pruning – for clean cuts that heal quickly. Avoid loppers, as they can bruise the stems.

Nov 19, Pruning twice a year, in winter and summer, will keep them productive and healthy. Without pruning, they can become straggly and less productive. Cutting back branches and shoots in the dormant season will concentrate sap flow in spring into fewer buds, resulting in strong growth. By contrast, summer pruning limits vigour by removing nitrogen-rich young growth, and will promote Author: BBC Gardeners' World Magazine.

Sep 14, Cut each main branch (the leader) back to eight leaves remaining and then cut each side branch of these main branches back to six leaves remaining.

If your plum tree is unproductive or is only producing fruit every two years known as biennial bearing, the cause may be lack of moisture at the roots, or a late frost affecting the flowers in spring.

Cut back any daft vigorous growth the might have occurred at the top of the tree. You want to keep the fruit within reasonable reach.