August Beauty gardenia

Sun

Full sun to partial shade; morning sun and afternoon shade are best where summers are hot. Shelter from cold, drying winds.

Water

Keep the root zone evenly moist but never waterlogged. Water deeply when the surface begins to dry; containers need more frequent checks.

Soil

Humus-rich, well-drained, acidic soil, ideally pH 5.0-6.0. Use ericaceous potting compost in containers; avoid chalky soil.

Height

4-6 ft (1.2-1.8 m)

Spread

3-5 ft (0.9-1.5 m)

Flowers

Fragrant, double white flowers, ageing cream; main flush in late spring and early summer, with scattered repeat flowers through summer and into autumn.

Foliage

Glossy, leathery, dark green leaves provide a dense evergreen framework.

Growth

Moderate in warm conditions; slower in cool climates.

Care needed

Medium

• Heat tolerant
• Wildlife
• Low allergen
• Fragrant

Northern hemisphere months. In Australia, shift them by six.

Difficulty

Hard

Toughness

Needs looking after

Pick your zone, country, light and whether you have pets.

1. Planting day

   1.6 ft (0.5 m)

2. After 1 year

   2.1 ft (0.65 m)

3. After 2 years

   2.7 ft (0.81 m)

4. After 3 years

   3 ft (0.96 m)

5. After 5 years

   4 ft (1.3 m)

About 7 years to full size.

From a typical nursery size, at an average rate for this kind of plant. A rule of thumb, not a forecast.

Cats and dogs

Toxic

Growth rate

Slow

• Water at the base before the root zone dries out, especially while buds are developing.
• Feed with an acid-loving shrub fertiliser in spring, following the label; avoid late-season feeding before winter.
• Spread 2-3 in (5-8 cm) of organic mulch over the roots, keeping it clear of the stems.
• Use rainwater where tap water is very hard, particularly for plants in containers.
• Move containers into a bright, cool, frost-free space before freezing weather arrives.

Pruning. Lightly shape immediately after the main flowering flush, shortening overlong shoots rather than shearing the whole shrub. Remove dead or damaged wood as needed; avoid heavy late-season pruning, which can reduce subsequent flowering.

Early spring

Check for winter damage and test soil pH if leaves are yellowing.

Spring

Plant after the risk of hard frost, apply acid-loving shrub fertiliser and renew mulch.

Late spring

Keep moisture steady as flower buds swell; inspect young growth for aphids and whiteflies.

Early summer

Lightly shape after the main flower flush and remove spent blooms if desired.

Summer

Check containers frequently for drying and give afternoon shade during intense heat.

Autumn

Stop feeding and move container plants under cover before freezing weather.

Winter

Keep sheltered plants bright and cool, watering enough to prevent the root ball from drying out.

• Plant near a patio, entrance or open window where the flower scent can be enjoyed.
• Use as an informal evergreen hedge in warm, sheltered gardens.
• Grow in a large container in a courtyard, allowing winter shelter in colder climates.
• Combine with camellias, azaleas and ferns in a sheltered, acidic-soil border.
• Use the white flowers and glossy foliage in a moon garden or restrained white planting scheme.

Garden styles it suits: Southern, Traditional, Modern courtyard, Sensory garden, White garden and Moon garden.

Plant it with: Camellias, Azaleas, Japanese pieris, Japanese painted fern, Lilyturf and Hydrangeas.

Wildlife: The dense foliage offers shelter for small garden animals. Double flowers provide less accessible pollen and nectar than single-flowered gardenias, so this is not a strong choice for a pollinator-focused planting.

• Yellow leaves with green veins: often caused by alkaline soil or unavailable iron. Check soil pH and drainage, use rainwater in containers, and apply chelated iron if needed; iron alone will not correct unsuitable soil.
• Bud drop: commonly follows drying out, waterlogging or sudden temperature changes. Maintain even moisture and avoid moving container plants repeatedly while buds develop.
• Aphids and whiteflies: inspect leaf undersides and new shoots. Wash off small infestations or use an insecticidal soap labelled for the pest, avoiding hot sun and open flowers.
• Root rot: persistent wetness can cause wilting, yellowing and root loss. Improve drainage, keep containers out of standing water and replace badly affected plants.

Toxic to cats, dogs and horses if eaten. Plant material, including fruits, contains compounds that can cause digestive upset; vomiting, diarrhoea and occasionally hives are reported in pets. It is not an edible plant, and ingestion by people may also cause digestive upset; keep it away from children likely to sample plants.

• Japanese camellia (Camellia japonica)

  Camellias have alternate leaves with finely toothed edges; gardenia leaves have smooth edges and occur in opposite pairs or small whorls. Most Japanese camellia flowers lack the gardenia's strong scent.

• Crape jasmine (Tabernaemontana divaricata)

  Single-flowered forms have pinwheel-shaped flowers, though double forms can resemble gardenias. Broken stems exude milky sap, and the leaves usually show more prominent side veins.

Gardenia honours the Scottish-born physician and naturalist Alexander Garden, while jasminoides means jasmine-like, referring to the flowers' resemblance to jasmine.

Propagation. Take non-flowering softwood or semi-ripe cuttings in late spring or summer. Root in a free-draining medium with warmth and high humidity; cuttings preserve the cultivar, whereas seedlings do not reliably come true.

Accepted botanical name

Gardenia jasminoides

In the US and Canada

Introduced in Pacific Basin and Puerto Rico.

Native range

Cambodia, China North-Central, China South-Central, China Southeast, East Himalaya, Hainan, Laos, Taiwan, Thailand and Vietnam.

Measured

Average height 300 cm.

Sources: GBIF (CC BY 4.0), USDA PLANTS and Trefle (CC BY 4.0). The care and design notes are LandscapeGPT's own.