First, we need to prepare seeds. It is best to choose fresh seeds. If seeds harvested in autumn are used, they need to be refrigerated for two months before sowing. Meanwhile, the seed coat of Robinia pseudoacacia is very hard. In order to improve the germination rate, the seeds can be clamped with pliers before sowing, and the seed coat can be cracked by tapping a few times in the depression of the seeds themselves. You can also soak the seeds in warm water 12-24 hours, until the seeds absorb water and swell, and the seed coat cracks, which makes them germinate more easily.
Secondly, we need to choose a suitable planting environment. Robinia pseudoacacia has strong adaptability, but it has strict requirements on soil, likes to bask in the sun fully, and its growing environment should not be too humid. Therefore, the more suitable soil is loose sand or porous crevices. At the same time, the soil weeds should be cleaned up before sowing, so that the surface is flat and smooth, which is convenient for the next operation.
Next, sowing is the key. Generally speaking, spring and autumn are more suitable for sowing. The depth of the seed should not be too deep, generally 2~3 times the width of the seed, and then gently compact the soil. The sowing spacing is about 10- 15 cm, which can ensure the growth of seedlings without interference.
Finally, pay attention to irrigation and maintenance. Sophora japonica seedlings need adequate water supply, but they should not be watered excessively, so as not to affect germination. Seedlings at seedling stage should be regularly loosened, weeded and fertilized. Robinia pseudoacacia can sprout green buds in about two months, and a green branch will be exposed after one hundred days.
In a word, planting Robinia pseudoacacia is not difficult. As long as you master the planting methods and maintenance skills, you can cultivate it into a strong tree.