Chrystanthemums - when to cut back
Hello. I planted these crysanthemums last year and they have been amazing, continuing to flower throughout the mild winter. I read that I should cut them back after they finished flowering, but that hasn't happened yet! However, now they are beginning to look a bit woody in the middle and the clump is 'sagging' apart. I think I should trim them back, but could anyone advise by how much? Any other tips would be gratfeully received. They have been a great addition to the garden, so I'd like to make sure they stay healthy!