Buddleja add colour to your garden, they are also great for wildlife, attracting bees and butterflies.
If you deadhead buddleja you will prolong the season on this colourful plant. This is because it gives a chance for new shoots to take growth and flower, so you could see colour until the end of October.
You will probably need to deadhead your buddleja in mid summer. Take a pair of secateurs, take a branch and identify the deadhead. If these are new growth shoots, remove the deadhead. This will allow the new shoots to start growing. You will need to do this across the entire plant.