June is the time to prune shrubs which have already flowered earlier in the spring or are currently flowering. These produce flowers on strong stems developed the previous year and include Ribes, Philadelphus, Deutzia Forsythia and Weigela. You should prune immediately after flowering by cutting back flowered growth to strong young shoots lower down. You want the plant to concentrate its energy on strong new shoots that will bear the best flowers so each year you should look to cut out up to 20% of the ageing stems. Focus on removing any damaged or dead shoots back to their point of origin or to ground level. Where there is obvious congestion or weak, spindly growth you can remove some stems to keep the shrub open to allow air movement.
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