A Detailed Guide to the Latest Propagation Methods for the Radermachera sinica

The scientific name of the Radermachera sinica is Radermachera sinica. It likes high temperatures and humid, sunny environments, tolerates high temperatures, fears cold, prefers moisture, and dislikes dryness. For cultivation, use loose, fertile, well-drained loam and sandy loam rich in organic matter. The flowering period is from May to September, and the fruiting period is from October to December. Now let us take a look at the propagation methods for the Radermachera sinica!

Seed Propagation

At the end of December, when the capsules are nearly splitting and the seeds are fully mature, harvest the long strip-shaped capsules, dry them, and release the winged seeds. After rubbing them, winnow away the membranous wing fragments and store them dry until sowing in the following spring. They can also be soaked for 2 to 3 hours, mixed into moist sand, and spread thinly in a large plastic basin in a shed. Keep the seeds and sand moist, check frequently to prevent mold, and sow them in the ground after the seeds germinate. For dry-stored seeds, between March and April, first soak them for 3 to 4 hours, remove them and spread them out briefly to dry, then mix them with sandy soil and scatter them on a prepared seedbed. Lightly cover with a thin layer of soil, cover with plastic film to retain moisture, and after the seeds emerge, remove the film and set up a light shade shed for shading. When they grow 2 to 3 true leaves, transplant them with a soil ball at a wider spacing. Alternatively, when they grow 4 to 5 large leaves, pot them or grow them in bags, strengthen water and fertilizer management, and they can be sold as commercial seedlings in the same year.

Cuttage Propagation

Between March and April, when the ambient temperature reaches about 15°C, cut 1- to 2-year-old lignified branches about 15 cm to 20 cm long, remove all leaves, and make the lower cut preferably 0.5 cm below a node. Insert them into a sandy loam seedbed, with the cutting inserted to a depth of about 1/3 to 1/2 of the cutting length. During the period of callus formation and rooting at the lower cut, spray water to keep the seedbed moist. After they grow a complete root system, transplant them with a soil ball into pots. It is best to plant 2 to 3 together, so they can take shape and be sold earlier.

Layering Propagation

Between March and April, on 2-year-old strong branches or stems, perform ring-barking below a node. The width of the bark removal is generally 2 to 3 times the diameter of the layered stem. Below the ring-barked opening, tie a 15 cm × 20 cm piece of plastic film. Use clean, moist peat soil or sandy loam to knead form a soil ball 8 cm to 10 cm in diameter at the ring-barked area. Then wrap the soil ball well with plastic film, leave a water-collecting opening at the top, and tie it against a thick main trunk to prevent it from drooping and breaking in the wind. By late autumn, after a relatively complete root system has grown from the ring-barked opening, cut it away from the mother plant and plant it separately in a pot.