I have quote a few liatris in my garden. All growing well - some of them very tall and and all loved by bees and butterflies. My question: when they start to look ragged and dying, do you cut the whole stem near the base and will this encourage new stems to grow? I didn't deadhead any of them last year and let them go to seed. Would prefer prolonged flowering if these two plants allow that with deadheading?
Help and avice would be very welcome please. Thank you.