Detailed Explanation of Jacaranda Planting Techniques and Management Key Points

  Jacaranda (Jacaranda mimosifolia), a deciduous tree of the Bignoniaceae family, reaching up to 15 m tall. Native to Brazil in South America, it has been introduced and cultivated for ornamental purposes in China in recent years. It is a tree valued for its ornamental form, foliage and flowers, widely planted as a street tree in tropical and warm subtropical regions. The wood is yellowish-white to grey, soft and light, with straight grain, easy to work, and can be used as furniture timber. This species has both ornamental and economic value.

  The flowering period runs from late spring to early summer, and the leaves fall completely when it blooms. The capsule is woody, ovoid, slightly flattened, light brown, about 5 cm in diameter, with small winged seeds. The wood is dark brown. It prefers a warm climate and should be planted in a sunny location. It is not demanding about soil conditions and grows well in ordinary neutral and slightly acidic soils.

  Propagation methods:

  Jacaranda is propagated by sowing, cuttings, tissue culture and other methods. Its capsules mature in November; after harvest they are placed in a windless spot to sun-dry or piled up, and after drying they are stored until March of the following year, sowing when the temperature is around 20°C, but the seed germination rate is only about 5%. Jacaranda cutting propagation can be carried out in both spring and autumn, choosing medium-maturity branches as cuttings, which gives a high rooting rate. Tissue culture of jacaranda is also relatively easy; some research institutions in China have used the stem tips and stem segments of seedlings as explants and propagated a large number of test-tube plantlets.

  1. Propagation by sowing: The fruit maturity period of jacaranda is in November; after picking, place them in a windless spot to sun-dry or pile them up, store them after drying, and sow in March of the following year. Since jacaranda is native to tropical regions, the temperature at sowing should be around 20°C.

  2. Propagation by cuttings: Jacaranda cutting propagation can be done in both spring and autumn; when taking cuttings, choose medium-maturity branches as cuttings, as this gives a high rooting rate.

  Temperature and light:

  Jacaranda is native to tropical America and prefers a warm, humid, sunny environment; it is not tolerant of frost or snow. The suitable growing temperature is 22 to 30°C; if the winter temperature falls below 15°C, growth stalls, and below 3 to 5°C there is cold damage; if the summer temperature exceeds 32°C, growth is also inhibited. It is light-loving and can tolerate partial shade.

  Soil and fertilisation:

  It prefers fertile, moist sandy loam or loam. Apply sufficient base fertiliser at planting; after it establishes, top-dress once each in spring and autumn, carry out pruning and branch training once every early spring, and aged plants need heavy pruning. When grown in pots, it can be dwarfed by trunk truncation or grafting, and watering and nitrogen fertiliser application should be controlled. Apply sufficient base fertiliser at planting, and after establishment top-dress in spring and autumn, controlling watering and nitrogen fertiliser application. Using a photosynthetic nutrient film fertiliser together with fertilisation can help absorb large amounts of light fertiliser, light energy and light, and is compatible with conventional fertilisers and nutrients to supply plant growth and development to the limit.

  Pruning and branch training:

  Carry this out once every early spring; aged plants need heavy pruning; when grown in pots, it can be dwarfed by trunk truncation or grafting; after pruning, promptly spray "Tree Guardian General" to destroy the nutrient source of harmful pathogens, eliminate viruses by osmosis, and close off the pathways of virus replication and spread.

  Pest and disease control:

  Jacaranda has few diseases; the main insect pest is the longhorn beetle. If reddish-brown frass is found at the base of the trunk, use a small knife to lift the bark and catch the larvae; alternatively, before the adults appear, apply a mixture of 10 parts quicklime, 1 part sulphur and salt below 80 cm on the trunk base to prevent the adults from laying eggs.