Cestrum corymbosum, often known as Sweet Jessamine or Night-blooming Jessamine, is a captivating shrub native to South America. This ornamental plant features abundant, trumpet-shaped flowers, typically white to cream. Their intense, sweet fragrance becomes particularly prominent during evening and night hours. Its beauty and aroma make it a popular choice for gardens.
Cestrum Corymbosum Cultivation
Sweet Jessamine thrives in full sun, requiring at least six hours of direct sunlight daily for abundant flowering. While it tolerates partial shade, especially in hotter climates, flowering may be less prolific.
The plant prefers well-draining soil rich in organic matter, with a slightly acidic to neutral pH (6.0 to 7.5). Incorporating compost, aged manure, or peat moss improves soil structure and nutrient content. For containers, ensure drainage holes and use a quality potting mix, adding perlite or pumice for enhanced drainage.
Consistent moisture is important for Cestrum corymbosum. Keep the soil moist but never waterlogged, as soggy conditions can lead to root rot. Watering once weekly is often sufficient, allowing the top inch or two of soil to dry out slightly between waterings.
Cestrum corymbosum is best suited for USDA Plant Hardiness Zones 7 through 11. In frost-free climates, it remains evergreen. In Zone 7, it may die back in winter but typically regrows from the roots in spring. The plant generally thrives in environments mimicking its native tropical habitat.
This plant is a light to moderate feeder, benefiting from regular fertilization during its active growing season (spring through summer). A balanced, slow-release granular or water-soluble fertilizer applied every 6-8 weeks is recommended. Cease fertilization about two months before the first expected frost to avoid stimulating new growth vulnerable to cold damage.
Pruning Cestrum corymbosum maintains its shape, encourages bushiness, and promotes healthy growth. Shaping can be done in early spring as new growth emerges. More severe pruning, performed in late winter when dormant, stimulates new branches and blooming. Removing dead, diseased, or crossing branches improves air circulation and overall plant health.
Propagating Cestrum Corymbosum
Propagating Cestrum corymbosum is achieved through stem cuttings, ideally softwood or semi-hardwood. Take cuttings during the active growing season, from late spring to early summer. Select a healthy, non-flowering stem, 4-6 inches long.
Using a sharp knife or pruning shears, cut just below a leaf node. Remove lower leaves, leaving two or three sets at the top to minimize moisture loss. Dipping the cut end into rooting hormone increases successful root development.
Insert the cutting into a well-draining potting mix, like peat and perlite or sand and compost. Ensure the bottom node is just beneath the soil surface. Keep the soil consistently moist but not waterlogged, and place cuttings in a sheltered, brightly lit location to encourage rooting.
Addressing Common Cestrum Corymbosum Issues
Lack of Flowers
Lack of flowers on Cestrum corymbosum often stems from insufficient sunlight, as the plant requires at least six hours of direct sun daily. Incorrect pruning or removing too much mature growth can also hinder flower production. Nutrient deficiencies, particularly a lack of phosphorus, may contribute to reduced flowering.
Yellowing Leaves
Yellowing leaves on Cestrum corymbosum signal underlying issues. Overwatering is a frequent culprit, leading to waterlogged soil and root rot. Insufficient watering can also cause stress and yellowing. Nutrient deficiencies, such as a lack of nitrogen or iron chlorosis, can also manifest as yellow foliage.
Pests and Diseases
Cestrum corymbosum is generally resistant to serious insect or disease problems, but common garden pests like aphids, whiteflies, and spider mites can affect it. Regular inspection helps detect infestations early. Organic options like neem oil or insecticidal soap are effective control methods. Fungal diseases are uncommon, but good air circulation through proper spacing and pruning helps prevent issues.