1. Choose a good seed stem: Choose a healthy stem from the mature roots of sweet potato, preferably one with a diameter of 1-2 cm and a length of 10- 15 cm, which is beneficial to growth.
2. Stem breaking: cut the selected seed stems from the middle with a knife, and each rhizome is about 5-8 cm long.
3. Burying stems: Bury the cut seed stems into the soil about 2-3 cm deep, and the spacing between each seed stem is 15-20 cm.
4. Water: water in time after planting to keep the soil moist, but don't over-water, so as not to cause root rot.
5. Waiting for growth: Under suitable temperature and humidity conditions, it usually takes about 2-3 months, the stem will germinate and grow, and the stem will gradually thicken to form a new sweet potato tuber plant.
6. Harvest: When the roots of sweet potatoes grow to a certain size, they can be harvested, usually about 3-4 months after planting.