Kangkong or water spinach can be propagated either by seeds or by cuttings. Sow the seeds in fresh potting soil (sow about 0.5 centimeters deep). Ensure that you keep the seeds consistently moist.
Also, remember that temperature should remain around 68 F (20 C). Germination occurs within a couple of weeks. To speed up the germination you can soak the seeds overnight in water. Growing kangkong from cuttings is the easiest method to propagate it. Just cut several 30-40 cm long cuttings from young growth and plant 15 cm deep in potting mix.
Planting
In subtropical and tropical climate you can grow kangkong anytime but in cooler climates plant it between late spring to early summer. Choose a site with full sun and well-drained soil. Either grow it in the pot (which is better as kangkong grows aggressively) or on the ground. You can also plant it near the edge of a pond or other water bodies.
Soil
Growing water spinach or kangkong needs evenly moist, wet, and nutrient-rich soil of pH level around 6 – 7.
Sun
Kangkong grows in a warm and humid subtropical and tropical climate, so it is essential to provide it full sun. However, it also grows in partial shade.
Water
Also called as Chinese watercress or water morning glory, you can easily understand from its name that it grows in swampy areas, it needs consistently muddy soil. Deep and regular watering is important to keep the soil nearly wet.