Sugar on Lawns: Sweet Idea, Zero Weed Control

Daytona Beach homeowner wants sugar protocol for St. Augustine: when, how much, effect on azaleas.

Chemistry reality: Sucrose = C₁₂H₂₂O₁₁. Heat it → water evaporates → carbon remains. Carbon ≠ plant nutrient. Microbes love it → temporary population boom → short nutrient flush. That's it.

What sugar does NOT do: Kill weeds, fungi, bacteria, azaleas. Zero herbicidal/insecticidal/fungicidal activity.

What helps St. Augustine:

• Mow high (3.5–4″)
• Water deep/infrequent
• Topdress with black humus/compost → feeds microbes *sustainably*
• Soil test → amend deficits

Sugar is a distraction. Invest in organic matter, not sucrose. Case closed.