Ferrous sulfate heptahydrate can be safely used in home garden. It is a green product which no harm to soil and plants. Ferrous sulfate contains the elements of iron and sulfur. Iron is more readily available to plants when the soil pH is below 7, as alkaline soil binds iron particles and makes them unavailable absorb for plants. If your soil is too alkaline, application of ferrous sulfate heptahydrate can lower the PH. [Read More]