What is a lawn biostimulant?

Lawn Biostimulants: Supporting Natural Growth Processes

Lawn biostimulants are naturally derived products containing compounds that enhance grass physiological processes, improve stress tolerance, and support root development without being fertilizers themselves. These products work through plant growth hormones, amino acids, and microbial communities to boost turf health. Unlike traditional fertilizers that supply nutrients, biostimulants enhance the grass plant's ability to utilize existing nutrients and withstand environmental stress. Interest in biostimulants has grown as alternative approaches to traditional chemical-heavy lawn care programs.

Common Biostimulant Sources and Types

• Seaweed/Kelp Extract: Rich in natural plant hormones (cytokinins, gibberellins) and trace minerals that promote growth and stress tolerance
• Fish Hydrolysate: Contains amino acids and proteins that support plant development and microbial activity
• Humic and Fulvic Acids: Improve nutrient availability and support beneficial soil microorganism populations
• Microbial Inoculants: Contains beneficial bacteria and fungi that improve nutrient cycling and disease suppression
• Amino Acid Products: Provide building blocks for protein synthesis and enzyme production supporting grass metabolism

Benefits and Applications

Biostimulants are particularly valuable in stress situations—summer heat stress, drought stress, disease pressure, or compacted soil conditions. These products don't replace sound fundamentals like proper mowing, aeration, and irrigation, but they enhance recovery and resilience. Biostimulants work best as part of comprehensive programs rather than standalone treatments.

Integration with Fertilization Programs

1. Spring Applications: Apply seaweed or amino acid products in April to support stress tolerance before summer stress arrives
2. Summer Stress Applications: Use biostimulants during peak heat to enhance stress tolerance and recovery
3. Recovery Programs: After disease, traffic damage, or environmental stress, biostimulants support rapid recovery
4. Fall Strengthening: Apply products supporting root development in September-October preparation for winter
5. Combination with Fertilizer: Many professionals apply biostimulants alongside fertilizer applications to combine nutritional and physiological support