For more flowers, cut buddleia in early spring. Early spring is a good time for pruning, as you do not endanger the formation of flowers.
Choose a frost-free, dry day from around mid-February to early April. On humid days, plants are more susceptible to fungal infections. If you prune at a later date, make sure that no birds are nesting in the bush. You can find even more exciting garden topics in our free newsletter, which you can subscribe to right here.