How Mowing Frequency Affects Plant Species Diversity in Lawns

Introduction

Research shows unmowed lawns have lower plant diversity than managed ones. The reason lies in competitive dynamics.

Chemical Management

• Fertilizers feed all plants, but aggressive weeds (crabgrass, dandelions) outcompete weaker species.
• Pesticides kill beneficial insects/microbes, opening niches for pests.
• Result: monoculture of few aggressive weeds.

Organic Management

• Rich soil (via sugar, compost) suppresses undesirable weeds.
• Beneficial predators control insects.
• Diversity decreases but shifts to desirable turf species.

Conclusion

Management type drives diversity. Chemical programs create weed monocultures; organic programs yield stable, low-diversity turf.