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The seeds of some tree species are soaked in cold and warm water before sowing to make the seeds absorb water and expand, and they can germinate early after sowing. The seeds of elm, mulberry, poplar, willow and other tree species should be sprayed with warm water and stirred before sowing to make the seeds wet evenly and dry in the shade; Generally small seeds,
Seed after soaking in cold water for 3 ~ 5 days; The seeds of tree species with thick seed coat, such as pine and Platycladus orientalis, need to be soaked in warm water at about 45 ℃ for 3 ~ 5 days, and then sown. The seeds of Robinia pseudoacacia, peach, plum, apricot and other tree species should be scalded with hot water. The method is to put the seeds into the jar, pour hot water at about 85 ℃, and the water consumption is about 2 ~ 3 times of the seed volume. While pouring water, stir with a wooden stick to heat the seeds evenly, and then cool the water naturally. After that, wash with warm water at 45 ℃ once or twice a day, and sow after the seeds expand and crack their mouths.