It’s nearly the end of February, there is still frost at night and some of the plants look shabby… Before I can see where the weeds are, I need to ‘tidy up’.…
They are marginally frost hardy to frost tender. Grow them in medium, well-drained soil in full sun or at most partial-shade. This perennial may be pruned severely if it becomes straggly.
You can propagate by stem cuttings in late summer or autumn or by seeds which may be sown outside in the autumn or spring. Darkness is needed for germination of these seeds.