“Phew, what a scorcher!” Remember the summer of 76? It didn't rain between March and September, there were hosepipe bans, and water had to be collected from…
They will range from frost tender to fully frost hardy. They prefer to grow in fertile, porous soil, but can grow in most soil types. They will need full sun, and you can propagate from seed, division or cuttings.
You can propagate the perennials, the sub-shrubs and shrubs by softwood cuttings of non-flowering shoots or by division from spring to mid-summer. Or you can grow from seed sown in autumn or spring.
Pests, diseases or disorders
Slugs and snails outdoors, under glass aphids, scale insects, mealy bugs and vine weevil.