Prune buddleia, forsythia, weigela and privet with a heavy hand
To rejuvenate, some plants must have their stems pruned near the ground. The plants I’m describing each have a large root system, so the crowns will send up numerous new stems.
The butterfly bush (buddleia), for example, should have all its branches cut down to within inches of the ground every year in early spring. Severe spring pruning encourages the development of strong stems that will flower more profusely. I use a chainsaw to prune my buddleia at the beginning of March, which encourages the plant to flower sooner.