A Detailed Guide to Common Spatholobus suberectus Varieties and Cultivation Techniques

Spatholobus suberectus is a traditional Chinese medicinal herb and an important raw material for many clinical medicines. Market demand is very high, and the prospects for cultivating Spatholobus suberectus are quite good. So what common varieties of Spatholobus suberectus are there? What cultivation techniques are there?

1. Common varieties of Spatholobus suberectus

1. Trifoliate Spatholobus suberectus

Trifoliate Spatholobus suberectus is relatively common among Spatholobus suberectus species. It is a rather short shrub, mainly distributed in China's Guangdong and Guangxi regions, and is also fairly common in southern China. It gets its name because it has only three leaves on the same stem node. Its leaves are oval-shaped and covered with a layer of fine hairs. It produces a large number of flowers, and the blooms are white.

2. White-flowered Mucuna birdwoodiana

As its name suggests, this variety has white flowers, but unlike the flower color of trifoliate Spatholobus suberectus, its flowers are grayish-white. Its leaves are pinnately compound, relatively narrow, and the leaf surface has no fuzzy layer and is fairly smooth. The flower shape is somewhat similar to a butterfly. Its flowering and fruiting period is from April to September, and it generally produces 10 seeds. It is mainly distributed in Guangdong and Guangxi.

3. Fragrant Millettia dielsiana

The leaves of fragrant Millettia dielsiana are also pinnate, and its flowers are also butterfly-shaped, but unlike the flower colors of the previous two, its flowers are purple, giving a distinctive look when in bloom. In addition, its branches have a layer of golden-yellow fine hairs. The flowering period is generally in summer, while the fruiting period is in autumn. It is widely distributed in southern China, and its root system can be used as medicine, with extremely high medicinal value.

4. Glossy-leaved Millettia nitida

Also known as blood-node vine, it is a short shrub. When its branches first grow out, they have a layer of fine hairs; after the branches grow larger, this layer of hairs disappears, and the branches also become smooth. Its leaves are relatively small, lanceolate or ovate. Its flowers, like those of fragrant Millettia dielsiana, are purple. It generally has only 4-5 seeds and is also distributed in Guangdong, Guangxi, and other places.

2. Cultivation techniques for Spatholobus suberectus

1. Site selection and land preparation

Spatholobus suberectus is suitable for growing in environments at altitudes between 200-3000 m, and usually grows at field edges, sunny hillsides, roadside thickets, or coastal sand dunes. When planting, it is best to choose a gently sloping site with convenient drainage and irrigation and shelter from the wind and moisture. The soil should preferably be sandy loam with deep soil layers and loose texture. In winter before planting, deep-plow it once to eliminate overwintering insect eggs. When preparing to plant the following year, apply 300-500 of decomposed farmyard manure per mu as base fertilizer. After shaping and leveling, form ridges, dig drainage ditches, and if conditions permit, disinfect the soil.

2. Propagation method

The propagation method for Spatholobus suberectus is cuttings. When new buds begin to sprout, choose thick, disease-free branches that have grown for 1-2 years as cuttings, cut them into 15-20 cm lengths with 2-3 buds on them, remove the leaves at the base, cut the base diagonally into a wedge shape, and trim the top flat for easy identification. For cuttings, soak them in rooting powder for 5-10 minutes to increase the survival rate, then use a wooden stick to make a small slanted hole, align the cutting with the small hole and insert it. The depth should be about two-thirds of the cutting, leaving at least 1 bud exposed. After cutting, cover with soil and water. In about half a month, it will take root and sprout.

3. Transplanting

After the cuttings survive, the main task is field management. When the seedlings have grown to 40-50 cm, they can be transplanted. This is generally best in April-May, because at this time temperatures rise and rainfall is abundant, which helps the transplant survival rate. After lifting the seedlings, dip the roots in thick yellow mud slurry to keep the root system moist. Also prune off half or two-thirds of the leaves to reduce water evaporation from the seedlings and improve the survival rate. Spatholobus suberectus likes deep-mountain dense forests, hillsides, and stream banks, and it also likes to twine around other trees, so understory cultivation is best. Under the forest, dig holes at a spacing of 2 m between plants and rows, apply 5 kg of farmyard manure at the bottom of each hole as base fertilizer, spread out the seedling root system, plant vertically, cover with soil, firm it by stepping, and water thoroughly to settle the roots.

4. Later-stage management

After transplanting and survival, promptly clear miscellaneous trees and weeds in the forest. For loosening the soil and weeding, manual methods are best. After loosening the soil, dead branches and fallen leaves can be spread over the ground surface to avoid exposing the topsoil. In July-August, during the peak growth season of Spatholobus suberectus, apply topdressing once in time to promote growth. Dig trenches near the root system and apply fertilizer, applying 5 kg of farmyard manure or 1 jin of compound fertilizer, then cover with soil promptly after fertilizing. At the same time, do a good job of pest and disease control. Spatholobus suberectus has relatively few diseases, mainly pests eating the leaves. Try to use chemical agents and adopt pollution-free killing methods to reduce pesticide residues.