My mums are from last season. They are now very leggy, and some are starting to bloom. Should I cut them back to make them more bushy? They are not very attractive.
I would cut the plants back now, despite the fact that they are just budding or blooming.
This will help shape up the plant for the summer and should help result in a healthy, and pretty plant for the Autumn season.
Here is a link to refresh you on the care requirements.