Hypericum calycinum -A subshrub that is commonly sold as an aggressive groundcover, useful for covering slopes. It is semi-evergreen and bears bright yellow starry blooms from July to August. This St. John’s Wort spreads by underground stems and produces green oval-shaped foliage. Prefers a part to full sun exposure. Grows 12-18″ high by 2’+ wide. Hardy to zone 5.
Hypericum androsaemum ‘Glacier’ – A semi-evergreen to deciduous shrub (depending on winter temperatures) with absolutely fabulous green foliage generously marbled in white with occasional pink tinting. It bears yellow flowers starting in early summer that mature to reddish-purple and then black. Part to full sun, but also blooms in the shade. Grows 3′ high. Zone 5.
Hypericum balearicum – This native of Spain is rarely offered and bears small yellow starry blooms (1.5″ wide) from early to late summer. It is a dense evergreen shrub with thick, dark green leaves (about 1/2″ long) with wavy edges and warty glands borne on red-tinted stems. A good choice for a rock garden as it requires sharp drainage. Grows 18″ high and wide. Hardy to zone 6.
Hypericum x ‘Rusty’ – This evergreen shrubby St. John’s Wort features unique new growth that is green tinted reddish-brown, and despite its name it is also quite resistant to fungal rust. ‘Rusty’ was discovered by Robin Denning of Brentwood Bay Nursery on Vancouver Island and it features yellow blooms from summer to autumn. Grows 3′ high and wide. Hardy to zone 5.
Hypericum x inodorum ‘Summer Gold’ – Another of the shrubby St. John Worts with new leaves that are bright chartreuse (often with darker green highlights) that age to a lime green. It bears yellow flowers starting in July that produce red berries which mature to black. This shrub is also quite drought tolerant once established. Grows 3-4′ high by 4′ wide. Hardy to zone 7.