How to grow a Radermachera sinica? Detailed guide to cultivation methods and precautions

Radermachera sinica is an ornamental plant often seen in many home and office environments, but many people do not know the cultivation methods and precautions for Radermachera sinica. Below, the editor will introduce the cultivation methods and precautions for Radermachera sinica in detail. Let us take a look together.

Growth habits of Radermachera sinica

Radermachera sinica likes a high-temperature, humid, and sunny environment; it tolerates high temperatures, fears cold, prefers moisture, and dislikes dryness. It grows in valleys or sparse forests on flat ground.

For cultivation, loose, fertile, well-drained loam and sandy loam rich in organic matter should be used. It is mostly distributed in valleys and sparse forests on flat ground at altitudes of 300 m to 850 m (Guangxi, Hainan) and 1,100 m to 1,700 m (central Yunnan and southward).

Propagation methods for Radermachera sinica

1. Seed propagation: At the end of December each year, when the capsules of Radermachera sinica are close to splitting and the seeds are fully mature, harvest the long strip-shaped capsules, dry them in the shade, and then store them dry. Between March and April of the following year, first soak the dried seeds for 3 to 4 hours, remove them, spread them out briefly to air-dry, mix them with sandy soil, and scatter them on the seedbed. Lightly cover with a thin layer of soil, cover with plastic film to retain moisture, and after the seeds sprout, remove the film, but shading is still needed. When 4 to 5 large leaves have grown, they can be transplanted into pots.

2. Cutting propagation: Between March and April, cut 1- to 2-year-old woody branches 15 to 20 cm long, remove all leaves, and insert them into a sandy loam seedbed. The insertion depth of the cuttings is about 8 cm of the cutting length. At the same time, water should be sprayed to keep the seedbed moist. After well-developed roots have grown, they can be transplanted into pots with a soil ball.

3. Layering propagation: In March to April, perform ring-barking below the node of a strong 2-year-old branch, with a width 2 to 3 times the diameter of the layered stem. Use clean, moist peat soil or sandy loam to shape a soil ball 8 to 10 cm in diameter at the ring-barked area. Then wrap the soil ball with a piece of 15 cm × 20 cm plastic film, mainly leaving a water-catching opening at the upper end, and tie it against the thick main trunk. By late autumn, relatively well-developed roots will grow from the ring-barked opening. At this time, it can be cut away from the mother plant and planted separately in a pot.

Cultivation methods for Radermachera sinica

1. Temperature control

Radermachera sinica likes a warm and humid environment, and temperature is most important. Keeping the daytime temperature between 19°C-21°C and the nighttime temperature between 18°C-20°C is the most suitable growing temperature. Too high or too low will affect its growth.

In the hot midsummer, the temperature should be kept below 27°C as much as possible. When the ambient temperature is very high, shading with a shed should be used appropriately. Increase environmental humidity to thereby raise the humidity of the leaf surface. In winter, the temperature must not be lower than 8°C, and the humidity must not be less than 5°C; otherwise, below this temperature it will be frostbitten.

2. Humidity control

Radermachera sinica prefers moisture in both its soil environment and indoor environment. Indoor humidity should be controlled between 70-80%. In large banquet halls where humidity cannot be controlled, we spray the leaf surfaces once in the morning and once in the evening. If the humidity is too low or it remains in a dry environment for a long time, the leaves will curl and turn yellow, affecting ornamental value.

3. Light control

Radermachera sinica is a plant that likes sunlight and also tolerates shade. Light is very important. Radermachera sinica likes to grow in a semi-shaded environment. In the north, under normal circumstances we keep it indoors, so there is no problem of direct sunlight.

Radermachera sinica fears being placed in a dark place for a long time, where neither direct light nor scattered light can reach it. After a long time, it will certainly drop leaves. Therefore, in winter it should be placed on a balcony or in front of a sunny window to get sufficient light.

4. Watering method

In summer, potted Radermachera sinica should be watered once every 3 to 4 days, but this also depends on the individual situation. In winter, indoors in the north, Radermachera sinica almost stops growing, and watering should be controlled so that the potting soil is simply not dry. If you water, water it thoroughly; if you do not water, do not pour a single drop into the pot. This is the principle; please remember it.

5. Pruning techniques

The purpose of growing Radermachera sinica is for ornament and to complement the indoor environment. If the tree shape grows poorly, it will not be beautiful, so it should be pruned carefully, generally into a mushroom shape or a rounded mound shape. Cut away some old leaves and yellow leaves.

6. Soil management

When Radermachera sinica is growing, soil is equally important. Choose soil that is loose, breathable, well-drained, and nutritious. Usually use garden soil : leaf mold : decomposed organic fertilizer : river sand = 5:3:1:1 to prepare the mix. Persist in loosening the soil once a month during the growing season to ensure that the root area always remains in a well-aerated state.

If water accumulation is found in the pot, it should be drained as soon as possible, and after the potting soil dries out, repot and change the soil to maintain better growth of Radermachera sinica.

7. Fertilization method

During the growing period, fertilize Radermachera sinica frequently to ensure vigorous growth, such as compound fertilizer or nitrogen-phosphorus-potassium 20:10:10 or farmyard manure, etc. In winter, fertilization can be stopped.

Alright, the editor has introduced the propagation methods and cultivation methods of Radermachera sinica here. Next, let us take a look at the pest and disease control and cultivation precautions for Radermachera sinica!