Written by Maggie
Jan 20 2021
Jacaranda mimosifolia D. Don is a deciduous tree of Bignoniaceae. Jacaranda mimosifolia D. Don is a deciduous tree with a height of 15 meters. Planted as a street tree, it can also be used as a garden characteristic tree species.
Jacaranda mimosifolia D. Don is a deciduous tree with a height of 15 meters. The leaves are opposite, with 2 pinnate compound leaves, usually more than 16 pairs of pinnacles, each pinna has 16-24 pairs of leaflets; the leaflets are elliptical-lanceolate to elliptical rhombus, 6-12 mm long and 2 wide -7 mm, sharp tip, wedge-shaped base, entire.
The flowers of Jacaranda mimosifolia D. Don are blue, the inflorescence is 30 cm long and the diameter is about 18 cm. The calyx is tubular, about 5 mm long and wide, with 5 calyx teeth. The corolla tube is slender, blue, slightly curved at the lower part and enlarged at the upper part, about 18 cm long, with rounded corolla lobes. Stamens 4, 2 strong filaments inserted in the middle of the corolla tube. The capsule is woody, flat ovoid, about 5 cm in length and width, thick in the middle, and gradually thinner around it, not flat. Flowering period is from May to June.
Jacaranda mimosifolia D. Don likes sunny and warm, humid climate, and requires fertile, loose, deep, moist and well-drained soil. Low-lying water or poor soil results in poor growth. If the temperature in winter is lower than 15°C, growth will stagnate. If it is lower than 3-5°C, chilling damage will occur, and if the temperature in summer is higher than 32°C, growth will be inhibited.
Jacaranda mimosifolia D. Don is native to South America (Brazil, Bolivia, Argentina). China's Guangdong (Guangzhou), Hainan, Guangxi, Fujian, southern Yunnan (Xishuangbanna) have introduced cultivation.
Flowering: From November to the end of March the following year, the apical meristem of jacaranda mimosifolia D. Don is still in the vegetative period. The apical meristem expanded in early April, and formed the flower primordium from mid-April to early May. The apical and lateral flower bud primordia differentiate rapidly, and flower spikes can be observed in mid-May. No flower bud differentiation was observed under continuous 25°C conditions. Flower bud differentiation requires at least 1 month of low temperature (15°C) conditions, and normal flowering requires more than 3 months of low temperature conditions. When it starts to grow in spring, it is appropriate to see more sunlight to facilitate autumn flowering.
Low temperature: 1-2 year old saplings are quite sensitive to frost. Generally, the shoots are frozen at 0℃, and all the ground tissues freeze to death at -3℃. The 3-year-old has a diameter at breast height of about 6 cm, and its cold resistance is also greatly improved. It can tolerate a low temperature of 8 ℃ for a short period of time, but it does not grow well, and the shoots are frozen at -3 ℃.
The flowers, leaves, and fruits of jacaranda mimosifolia D. Don are unique and have a good viewing effect. Large pinnate compound leaves, beautiful, elegant and quite dynamic. The flowering period of jacaranda mimosifolia D. Don is from April to June, which is the end of spring and summer. There are few flowers in the garden, but it uses blue elegance and coolness to drive away the heat and heat. A single color creates a romantic and quiet environment. Due to the characteristics of jacaranda mimosifolia D. Don, the landscaping effect is better. The tree shape of jacaranda mimosifolia D. Don is similar to the shape of Delonix regia, very beautiful, and very suitable for garden landscaping. As a landscaping tree species, jacaranda mimosifolia D. Don can be planted alone in the park, and can be planted as a street tree, or used as a garden characteristic tree species. The trunk of jacaranda mimosifolia D. Don is straight, the crown is oval, the green shade is like an umbrella, the thin leaves are like feathers, the flowers are blue and elegant, the flowers bloom in early spring, which is the season of monotonous colors in the garden, with high branch points, suitable for planting The roadside provides shade for pedestrians to dispel the heat, and creates a quiet, cool and quiet environment for the highway. Jacaranda mimosifolia D. Don is rarely used in residential areas, but it can create a quiet, relaxing, chic and elegant environment in residential areas.
Jacaranda mimosifolia D. Don can be used to make furniture and paper. The trunk is straight, brown wood, soft, and easy to process. Jacaranda mimosifolia D. Don is a good material for making furniture and wood carving crafts. The density is low and it is more suitable for making chemical mechanical pulp. Jacaranda mimosifolia D. Don is an excellent pulping and papermaking tree species, which can be used to make all kinds of paper. The pulping performance of jacaranda mimosifolia D. Don is closely related to the age of the tree. The fiber length and thickness increase with the growth of the tree age. Comprehensively considering the 6-year-old jacaranda mimosifolia D. Don is more suitable for making sulfonated chemical mechanical pulp.