It can't be used after the shelf life, because the opening time is too long, bacteria invade, and free water molecules in the air invade, which can be said to be bad. If you grow flowers at home, you can use them as fertilizer. It's not good to clamp your mouth with a clamp. It takes too much time. For the sake of health, it is recommended not to save it. Throwing away or using fertilizer is the right solution!