The Wendan trees in bonsai have been planted for a long time, and the soil will have no nutrition. When changing soil, remove old roots and rotten roots and apply some nutrient fertilizers such as phosphate fertilizer and bone meal.

If the Wendan tree has been planted in the pot, it would be nice to plant it in another soil. If the soil still doesn't bloom, it may be that the seeds themselves are broken. Maybe it was too much watering. If the Wendan tree is soaked in water for a long time, its roots will rot.