Which of the following practices can minimize excess moisture in the garden?

Employing proper drainage is crucial for managing excess moisture in a garden setting. Effective drainage systems help prevent water from pooling around plant roots, which can lead to root rot and other moisture-related diseases. Proper drainage allows excess water to flow away from plants, maintaining optimal soil moisture levels that support healthy growth.

By ensuring that water does not saturate the soil, proper drainage facilitates air circulation in the soil, promotes healthy root development, and prevents the proliferation of fungal pathogens that thrive in wet conditions. This practice not only enhances plant health but also improves the overall resilience of the garden environment.

The other practices listed do not contribute to minimizing excess moisture effectively. Frequent heavy watering can lead to waterlogged conditions, while incorporating synthetic fertilizers does not directly address moisture levels. Reducing plant diversity may hinder the ecosystem's natural balance and resilience, but it does not inherently manage moisture levels.