Exquisite Jatropha Integerrima: A Guitar-Shaped Beauty

The Jatropha integerrima, also known as Peregrina or Spicy Jatropha, gets its name from its unique guitar-shaped leaves. It’s widely recognized by other names such as the Variable-leaf Jatropha, Guitar-leaf Cherry, Nanyang Cherry, and Everyday Cherry.

Belonging to the Euphorbiaceae family, it is a type of evergreen shrub. Its plant body secretes a milky sap that is toxic. The Peregrina is originally from the West Indies but is widely cultivated in southern China.

Morphological Features

Stem: The shrub grows approximately 1 to 2 meters high.

Leaves: The single leaves alternate, and they’re broad-lanceolate in shape, usually clustered at the top of the branches. The leaf base has 2 to 3 pairs of sharp spines, and the leaf tip gradually tapers. The leaf surface is dark green, while the back is purple-green. The petiole is covered with soft hairs, and the leaf surface is smooth.

Flower: The flowers are in corymbose inflorescences, with 5 petals and a red corolla, resembling cherry blossoms. They are unisexual, with male and female flowers on the same plant but on different inflorescences. There are also pink varieties. Blooming period: from spring to autumn.

Fruit: The fruit turns black-brown when it matures.

The papery leaves are alternately arranged and vary in shape, from oval, to inverted egg-shaped, to violin-shaped, measuring 4-8cm in length and 2.5-4.5cm in width. The leaf tip is sharply pointed or tapers off gradually, while the base is blunt and round.

The leaf margin near the base often has several sparse sharp teeth. The underside of the young leaves is purplish-red. The plant is dioecious. The corymbose inflorescences are terminal, and the flowers are unisexual. The sepals are split into 5 parts, and the petals are long oval, with a floral disk.

Male flowers have 10 stamens in two whorls, with the outer whorl slightly fused and the inner whorl fused up to the middle. Female flowers are slightly larger than the male flowers, with a glabrous ovary and three columns fused at the base, with two-lobed column heads.

Growth Environment

The Peregrina thrives in warm and humid conditions and is sensitive to cold and dry climates. For winter survival, it needs to be kept above 12℃. It prefers plenty of sunlight but can tolerate semi-shade. It flourishes best in loose, fertile, and organic-rich acidic sandy soil.

Distribution Range

Originally from the West Indies, it is widely cultivated in southern China.

Propagation Methods

Common propagation methods for the Variable-leaf Jatropha include seeding and cutting.

Cutting is generally preferred. During the growing season, cut about 20 cm from the semi-woody top stem with a bud, leaving two-thirds of the leaves.

Dip it quickly into a solution of either 500 ppm naphthalene acetic acid or 800 ppm indolebutyric acid for 5-7 seconds. Insert the cuttings into a sandbed, mist under full sunlight. The cuttings should root within around 25 days.

Cultivation Techniques

Transplanting: Once the cuttings of the Variable-leaf Jatropha have rooted, they can be transplanted for bag cultivation in a loose potting soil. When the seedlings reach approximately 30 cm in height, they can be transplanted into the ground.

After transplanting, pay attention to water management. After the plant has survived transplanting, manage it using conventional methods, with an emphasis on sufficient water and fertilizer supply.

Landscaping Styles:

Cluster Planting: Several plants can be grouped together for a bushy effect, with several Variable-leaf Jatrophas planted close together. This presents the effect of a single, isolated plant when viewed from a distance, highlighting its individual charm for appreciation.

Mass Planting: A large area of Variable-leaf Jatrophas planted together creates an excellent visual effect, with splashes of red amongst the greenery when the plants are in bloom.

Combination with Other Plants: On a spacious lawn, the Variable-leaf Jatropha can be combined with other plants to create a vibrant, colorful composition.

Pot Planting: The Variable-leaf Jatropha can also be used as a large potted plant, placed on a balcony or in a courtyard, adding beauty to people’s homes.

Fertilizer and Water Management: After the Variable-leaf Jatropha seedlings have survived transplanting, lightly apply the first round of water and fertilizer, followed by another round 10 days later. Water and fertilizer should be applied lightly and frequently to ensure that the plants receive sufficient nutrients for robust growth.

Apply phosphorus fertilizer before the formation of flower buds, and spray the leaves with potassium dihydrogen phosphate 1-2 times to promote blooming, with larger, more vividly colored flowers. Apply potassium fertilizer in winter to enhance its cold resistance. In winter, be cautious about cold protection.

Shaping and Pruning: The Variable-leaf Jatropha is strong and resistant to pruning, but it generally retains its natural shape, so light pruning is preferable during cultivation. Regularly prune dead or weak branches, letting the plant naturally take shape, with its elegant branch and leaf form.

Disease and Pest Control

Anthracnose

Symptoms of Damage: This mainly affects the branches and leaves of the Variable-leaf Jatropha. In the early stages of the disease, round or oval red-brown spots appear on the leaves, which later expand into deep-brown circular lesions, 1-4 mm in size.

Under humid conditions, these lesions may have many sticky, vermilion liquid spots. In severe cases, a single leaf may have dozens of lesions, which may merge and cause the leaf to dry out. In later stages, lesions may perforate the leaves, leading to easy leaf drop.

Control Measures: ① Plant at a reasonable density to maintain ventilation and light penetration between plants. ② In the early stages of disease, use a solution of 600x 80% anthrax fumigation, or 700x 47% Kairalin wettable powder, or 400-600x 45% Teckton.

Cottony Cushion Scale

Symptoms of Damage: This is a polyphagous pest. The female adults and nymphs cluster on the backs of leaves and shoot tips of the Variable-leaf Jatropha, sucking sap. This leads to yellowing leaves, wilting shoots, a large amount of flower drop, weakened photosynthesis, dwindling vigor, premature leaf fall, and even whole branches dying off.

Control Measures: ① Regular checks and if the infestation is minor, manual removal can be done. ② Protect natural enemies such as the Australian ladybird and big red ladybird to control the damage from the Cottony Cushion Scale. ③ During the peak hatching period of the nymphs, use a 20x solution of pine alkaloid, or a 0.3-0.5 degree solution of Polyram stibnite.

Main Value

The Variable-leaf Jatropha is widely cultivated as an ornamental plant in southern China. It has great aesthetic features, with a beautiful shape, leaves, flowers, and fruit to appreciate. Its leaves resemble the shape of a cello, unique and pretty.

Its flowering period is very long, almost all year round, with bright red flowers. It is tolerant to pruning, highly adaptable, and can be pruned into different shapes based on the desired landscape effect and functionality.

The natural shape of the Variable-leaf Jatropha is graceful and beautiful, its leaf form unique, and its flowers are as brilliant as cherry blossoms. It blooms continuously throughout the four seasons, earning it the name of “Daily Cherry.”

It is an important ornamental plant in tropical regions. The Variable-leaf Jatropha can also be planted in flower beds and floral mirrors, with its bright and elegant red flowers creating a pleasing effect whether viewed from afar or up close. It can also be used for potted ornamental cultivation.

Parks and Scenic Areas: Planting several clusters of Variable-leaf Jatropha around pavilions, towers, and along the water’s edge can add color and vitality to parks and scenic areas. The cello-like leaves are evergreen all year round, and the plant keeps blooming, enhancing the interest of tourists and letting them appreciate the beauty and harmony of nature.

Courtyards and Residential Areas: As an ornamental flowering shrub, the Variable-leaf Jatropha is increasingly favored for greening courtyards and residential areas.

More and more people have come to recognize and love it through its widespread use in landscaping, making it an important part of the local environment’s beautification and greening.

Roads: The Variable-leaf Jatropha can also be used for greening along roads and city entrances and exits. The entrances and exits of cities can be planted in large areas or mixed with other colored plants to create a colorful atmosphere, creating a warm welcome for guests.

Planting them on green strips and median strips can shift drivers’ attention from the monotonous green leaves to the bright red flowers of the Variable-leaf Jatropha, thereby refreshing their spirits, attracting attention, and reducing the risk of road traffic hazards.