Most of the plants under L. thuringiaca, mentioned here, are probably hybrids with L. oblia. This will help the plant to form bushy growth from the base. Often, the plant dies right back to the ground in winter, anyway. As an alternative, take cuttings in late summer, or early fall. There are many who consider L. thuringiaca cultivars to be sub-shrubs.
Most plants enjoy a warm, sunny position, and a well-drained soil.
After the first blooms begin to fade, pruning the plants back lightly will encourage more compact branching and a renewed burst of fresh blooms. Plants listed here will usually bloom within the first season. If you are in a colder region, you can treat them as delicate annuals. They are not usually very long-lived shrubs or perennials, which is a fact that favours seed production of a favourite variety. Of course, you can propagate them by softwood cuttings as mentioned earlier, though sometimes the cuttings do not strike too readily.