Knowledge

Is Sodium Metabisulfite Harmful to Plants?

Sodium metabisulfite (Na₂S₂O₅) can be harmful to plants if used in significant amounts. It is a chemical commonly used as a preservative and disinfectant, but it releases sulfur dioxide (SO₂) when it comes into contact with water.

• Phytotoxicity: High concentrations can cause phytotoxic effects, such as leaf burn, inhibited growth, and possible plant death.
• Soil Impact: Sodium metabisulfite may alter soil chemistry, potentially harming beneficial microbes and affecting nutrient availability.
• Limited Use: At very low concentrations, it may not cause visible harm, but repeated or high exposure is not safe for most plants.

In summary, sodium metabisulfite should not be applied directly to plants or soil unless specifically recommended and used very carefully. For plant care, consider safer alternatives.