Iron is an essential element in organism. It is soluble in water after rusting and can be used to irrigate alkali loving plants.
Rust water is best diluted with water before watering to prevent the root system from being burnt due to excessive concentration.
The old iron nails, screws, iron sheets and other scrap iron shall be soaked in water, and the water can be diluted and watered after the water turns yellow. Using rust water to irrigate the Yellow Gardenia can make the leaves turn from yellow to green and restore the luster of the leaves.
Rust water is suitable for alkaline flowers, such as gardenia, etc.