One: The softening of yellow leaves of Petunia seedlings is caused by excessive watering. It is not easy to get too wet when watering at ordinary times. Too wet soil tends to accumulate water, which leads to root rot and yellow leaves softening. It is best to keep the soil dry and water it, which is beneficial to the growth of roots and is not easy to soften the yellow leaves.

Second, the soil board is hard and impermeable, which leads to the water poured cannot penetrate into the soil layer, which leads to the inability of most roots to absorb water and nutrients, leading to dehydration and malnutrition of leaves, soft and yellow leaves and other symptoms. The best way is to loosen the soil properly, which is beneficial to soil loosening, ventilation, drainage and root growth.

Three: pests and diseases are also easy to cause yellowing and softening of leaves. It can be observed that if the leaves are caused by pests, pesticides can be used to kill insects, and if they are caused by bacteria, antibiotics can be used to treat diseases.

Four: lack of nutrition is also easy to cause symptoms of softening of yellow leaves. Dig a hole at the edge and bury compound fertilizer and mineral additives according to the amount, which is not easy to be too much to prevent fertilizer damage.

Five: It is normal for the seedlings to grow up slowly and the old leaves at the bottom to wither and die slowly. As long as the amount is not much, it will not have much impact.