Feeding Soil Microbes with Sugar: Does It Help or Harm Your Garden?

The Theory

Many fungi form essential associations with plant roots (mycorrhizae). Fungi and bacteria readily metabolize environmental carbon sources like sugar.

Possible Benefit

Sugar could feed beneficial fungi, which then break it down into smaller molecules that nourish the plant.

Risk

Adding nutrients may favor one microbial group over another, disrupting the natural balance. The soil food web is complex; unintended consequences are possible.

Bottom Line

While plausible, the practice lacks robust scientific consensus. Proceed cautiously and observe plant response.