Don't you love it when people ask you what your favourite plant is? I mean, it's such a “piece of string” question: do they mean my favourite tree, shrub,…
Watch out for crown rot; it can be a problem so plant in well-ventilated areas and divide every 2 to 3 years. Powdery mildew.
By division in spring or early autumn.
Pests, diseases or disorders
Mildew, crown-rot and aphids.