If you also throw away the water after washing or boiling rice every day, then think twice before doing so. Rice water acts as a natural nutrient booster for many plants. It contains starch, vitamin B, potassium, magnesium and micro nutrients, which can help in increasing plant growth, strength of roots and greenery of leaves. However, it should always be used only with rice water without salt and spices and it is better to use it in limited quantity. So let us know for which 5 plants rice water is no less than a power tonic.