Cananga odorata is a fast-growing tropical tree in the custard apple family (Annonaceae), native from Indochina to northeastern Australia. It is the source of ylang-ylang essential oil, steam-distilled from freshly picked flowers and used in some of the world's most recognized perfumes, including Chanel No. 5. It ranks among the most extensively used natural fragrance materials in the global perfume industry.
Under ideal conditions the tree can put on 4–5 ft of growth per year and exceed 50 ft if left unpruned, developing a tiered, pagoda-like crown. Regular heading-back keeps it at 10–20 ft and puts flowers within reach while stimulating the lateral shoots that carry subsequent flushes. It requires consistently warm temperatures, humidity, and deep fertile soil. Cold sensitivity is high; temperatures near 32 °F damage young growth. In the landscape it functions as a specimen or canopy tree in tropical and subtropical gardens. Prefers a soil pH of 6.0–7.0 and benefits from a deep organic mulch layer to conserve moisture.
Ylang-ylang oil has a long history in Southeast Asian traditional medicine. Flowers macerated in coconut oil produced Macassar hair oil, widely traded in the 19th century. Modern pharmacological studies have found some support for anxiolytic and mild antihypertensive effects from the essential oil, consistent with its longstanding aromatherapy use.
Root rot
Plants wilt, yellow, and stunt even in moist soil; lower stems and roots turn brown, soft, and mushy and the plant may collapse. Most common in heavy, wet, or poorly drained ground.
Improve drainage and stop overwatering, and never plant too deep. Lift and destroy badly affected plants along with the soil around the roots. Grow in raised or free-draining beds to prevent it returning.
Fungal leaf spot
Brown or purplish spots on the leaves, often ringed with a yellow halo, that spread and merge in warm, humid, or wet weather; heavily spotted leaves yellow and drop early.
Pick off spotted leaves and clear fallen debris to remove overwintering spores. Improve air circulation by thinning, and water at the base so foliage dries quickly. If it persists, apply a copper- or sulfur-based fungicide at the first sign.
Sooty Mold (Scale-Associated)
Black, powdery or crusty coating on upper leaf surfaces and stems. Affected leaves may yellow and drop in severe cases. The mold grows on honeydew secreted by scale insects, mealybugs, or aphids feeding on the plant.
Control the underlying pest infestation first using horticultural oil or neem oil applied thoroughly to stems and leaf undersides. Once pest populations are reduced, sooty mold stops spreading and weathers away over time. Rinse foliage with a strong stream of water to dislodge existing mold deposits.