Which technique prevents light from reaching weed seeds, inhibiting their growth?

Mulching is an effective technique for preventing light from reaching weed seeds, which in turn inhibits their growth. By applying a layer of organic or inorganic material over the soil, mulch blocks sunlight, effectively suppressing the photosynthesis process that many weed seeds need to germinate and grow. Additionally, mulch conserves soil moisture and can improve soil health over time, further enhancing plant growth while limiting weed establishment.

Mechanical control and controlled burning are more active methods of weed management rather than strategies for light exclusion. Mechanical control involves physically removing weeds, while controlled burning can eliminate weeds through fire but does not specifically block light. Shading can suppress weed growth but is not as direct or consistent as mulching in creating a barrier that prevents light from penetrating the soil. Overall, mulching is a proven, passive approach to weed management that effectively deprives weed seeds of the necessary light for germination.