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Winter or early spring pruning may reduce blossom on flowering plants or stimulate new growth that could be damaged by frosts or severe cold. If a plant puts forth a crop of suckers (tender shoots from the main plant's roots), you should remove them as soon as they appear.
Summer pruning may result in decreased root growth, which will keep the plant to a smaller size. Thinning should be done either early so the plant has time to recover, or after growth has stopped for the season.