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 moderately rich, well-drained soil in full sun or at most partial-shade. They bloom best in full sun.
You can propagate from seed in the autumn or spring, from stem cuttings in summer or autumn. Seeds will need darkness for germination.