Natural Lawn and Shrub Treatments: DIY Fungicide, Pesticide, and Fertilizer Recipes

Why Go Natural?

Conventional lawn chemicals—pesticides, herbicides, fungicides, and synthetic fertilizers—carry documented risks to environmental and human health. The growing natural lawn care movement offers effective alternatives using household ingredients, reducing chemical exposure while maintaining beautiful landscapes.

Natural Fungicide Options

Most natural fungicides work by altering environmental pH beyond the narrow range fungi tolerate. A simple spray combines 2 tablespoons apple cider vinegar per gallon of water—avoid white vinegar, which may contain synthetic residues harmful to plants. For a soil-friendly alternative, grind equal parts eggshells, powdered limestone, and dolomitic lime into a fine dust. This alkaline mixture adjusts pH without harming beneficial insects and deters slugs and snails via its calcium carbonate content. Apply sparingly to avoid pesticide-like effects on soil microbes.

Natural Pesticide Recipe

Many plants produce oils that repel or kill insects. In one gallon of water, steep: a handful of chopped jalapeño or habanero peppers, one crushed garlic bulb (not just a clove), 2 tablespoons lemon juice, ¼ cup chopped peppermint leaves, and ¼ cup ground horseradish for several hours. Strain solids, then add 2 tablespoons diatomaceous earth and ¼ cup dish soap. This multi-mechanism spray works through: citric acid (toxic to ants), peppermint/horseradish (beetle deterrents), garlic/alliums (soft-bodied insect control), capsaicin (neurotoxic to most insects), diatomaceous earth (physical exoskeleton damage), and soap (improves adhesion and causes drowning).

Natural Fertilizer "Tea"

In a large sack, combine: 4 quarts seed meal, 1 cup finely ground agricultural lime, 1 cup gypsum, 1 quart guano, and 1 quart basalt dust. Secure the sack and steep in a clean 55-gallon drum of water for one week. Remove the sack (incorporate spent contents into garden beds). One gallon of this nutrient-rich liquid covers 100 square feet, providing season-long nutrition: gypsum (calcium), guano (phosphorus), basalt dust (micronutrients/trace minerals), seed meal (nitrogen), lime (potassium).