Getting wintersweet seed propagation right means mastering both the timing of seed collection and the sowing method

Wintersweet seed propagation is a way of growing wintersweet seedlings from mature seeds, and it is a form of sexual reproduction. Compared with grafting, cuttings and division, sowing is simple to carry out and yields a good number of seedlings at one time, so it is often used for raising seedlings in bulk or for growing rootstock.

The seeds must be harvested before sowing. Wintersweet fruit usually ripens in summer; once the seeds inside the fruit receptacle turn dark brown, they can be picked, dried in a ventilated spot and then removed from the fruit. The seeds can be sown as soon as they are collected, or dried and stored until the following spring. Before spring sowing, soak them in warm water to speed up germination so they absorb enough water, which gives more uniform sprouting.

For sowing, choose a loose, fertile, well-drained sandy soil. Sow the seeds in individual spots or broadcast them, then cover with soil, just enough to bury the seeds, water thoroughly and keep the soil moist. After the seedlings emerge, shade them lightly and avoid direct strong sunlight; once the seedlings reach a certain height, thin them out or transplant them.

Wintersweet likes sunlight and tolerates cold and drought, but it cannot stand waterlogging, so do not water too much in normal care and make sure to drain well during the rainy season. Note that seedlings grow slowly and often need several years of cultivation before they flower, and traits such as flower color and fragrance may differ somewhat from the mother plant. For this reason, seed propagation is mostly used to grow rootstock or to breed new varieties; to obtain a superior variety with stable traits, grafting is usually still needed later on.