Debunking the Beer-and-Ammonia Lawn Tonic Myth

The "Recipe" and Why It Fails

The concoction—ammonia, lemon dish soap, beer, and Coke—contains tiny nuggets of truth but is functionally useless:

• Ammonia provides nitrogen, but it evaporates before plants can absorb it.
• Detergent helps spread/stick, but at recipe concentrations it burns foliage like an herbicide.
• Beer and Coke supply simple sugars, but soil microbes specialize in complex plant carbohydrates, not refined sugars.

The Bigger Picture

Such "kitchen chemistry" tonics are promoted by entertainers like Jerry Baker, whose advice is widely condemned by university horticulturists as scientifically unsound and sometimes dangerous (e.g., nicotine from chewing tobacco, herbicides in food containers). PBS stations air him for fundraising, not horticultural accuracy. His commercial products contain standard fertilizer/herbicide ingredients—at higher prices.

Bottom Line

Stick to research-based recommendations: soil testing, appropriate fertilizers, and targeted pest management. The only thing the beer tonic grows is hogwash.