Pinch the tips of the new growth in spring to create a bushier habit.
Varieties available include:
Hypericum perforatum, (St Johns Wort) a herbaceous perennial with creeping rhizomes growing to 1 metre high.
Hypericum calycinum, a low growing, dense shrub - great for stabilising slopes. Best grown in pots in Victoria and south eastern Australia because the plant is regarded as an environmental weed particularly if grown near bushland.
There are a few pale pink varieties as well.