Some say to cut away suckers from the base of lilacs. Some say leave the suckers and to cut the old limbs for best flower production. So I haven't cut any of my lilac shrubs. I don't know which way to go with this, so I do nothing. I want my Lilacs to be big and with lots of flowers for they have lots of room to grow. I would love to hear what other people do with their Lilac bushes.