have phlomis russeliana seeds sown in a container. Is now five years old but never flowers
I've had them flower in their second year from seed.
In my opinion perennials don’t like to be cramped in containers, they can’t reach their full potential in a pot. As
says they are full grown, about 4’ tall and flowering in the second and subsequent years.
Gardening on the wild, windy west side of Dartmoor.
I sometimes try and keep some going in pots, for sale on open day, but they don't like it, never flower and usually end up on the compost heap, all sad looking