Species · genus Gardenia · Rubiaceae

Cape Jessamine

Gardenia thunbergia Thunb.

Also known as: Forest Gardenia · Starry Gardenia · Wild Gardenia

Growth habit

shrub or tree

Native range

Cape Provinces, KwaZulu-Natal, Mozambique

Gardenia thunbergia — reference photo — Afrodita_nz · Public domain

Cultivars of G. thunbergia

The named forms growers keep — each with its own page, each honest about how much we know.

No named cultivars catalogued under G. thunbergia yet. When growers document a stable, named form, it earns its own page here.

Guide

The species-level account. Cultivar pages build on this and say where they differ.

White Gardenia, Introduced

Gardenia thunbergia is an evergreen shrub or small tree known as white gardenia, prized for its large, creamy-white, heavily scented flowers. It is one of only six Gardenia species native to South Africa.

Source: Kew

Southern African Roots

This species grows along the eastern coast of South Africa, from the Eastern Cape north into KwaZulu-Natal, and into southern Mozambique, generally within evergreen forest and along forest margins, though it is occasionally found in woodland and veld. It is named for Carl Peter Thunberg, the Swedish physician and botanist who studied the flora of the Cape extensively. The genus itself honours Dr Alexander Garden, a Scottish physician and amateur botanist. The species is considered of least concern overall, though it has been noted as rare within the Cape.

Source: Kew

Warmth, Sun, Moisture

White gardenia needs a frost-free climate and ample water, either through generous summer rain or year-round watering. It does best in slightly acid soil rich in humus, and will grow in either full sun or part shade.

Source: Kew

Grown From Cuttings

Beyond seed, which must be freed from the plant's hard woody fruit, this gardenia can be propagated by cuttings.

Source: Kew

Scent, Flower, Fruit

The plant reaches up to 5 metres, with a smooth whitish main stem and clusters of glossy green leaves gathered at the ends of short branches. Its flowers are large, eight-petalled, and creamy white, carrying an overpowering scent most noticeable at night, a trait typical of moth-pollinated flowers; they appear from October to March. These give way to hard, woody, greyish, egg-shaped fruits whose seed must be extracted by smashing or sawing through the shell.

Source: Kew

Prune After Flowering

Any pruning this plant needs is best carried out soon after it finishes flowering.

Source: Kew

Care recipe

The species record — the baseline every cultivar inherits unless it says otherwise.

Care notes are early — not yet verified

Light: ai:claude-opus-4-8
Water: ai:claude-opus-4-8 (range 5-10d)
Humidity: ai:claude-opus-4-8
Soil: ai:claude-fable-5
Care: ai:claude-fable-5

Light

Bright, indirect

Water

≈ every 10 days

Humidity

Medium

Temperature

13–27 °C

Soil mix

Acidic, well-draining loamy mix

Propagation

Semi-hardwood cuttings or seed

Fertilizing

Acid-formula feed monthly while growing

Growth rate

Slow

Flowering

Fragrant white flowers in bright light

ToxicityAuthoritative · species

Not yet documented

This is where toxicity lives — every cultivar of this species inherits it and none can override it.

Reference images

Every image credited. Licenses link to their deeds.

Sources: ai:claude-opus-4-8 · ai:claude-opus-4-8 (range 5-10d) · ai:claude-fable-5

Kept true by its growers

Every fact here carries its source. Grow Cape Jessamine yourself? What you’ve observed — how it drinks, how it holds its color, a name that’s off — and a clear photo of your plant are exactly what keep this page honest. Contributions are reviewed before anything changes.