What advantage do irrigation systems offer in landscaping?

Irrigation systems in landscaping primarily offer the advantage of conserving water through the use of harvested rainwater. This practice is beneficial because it reduces the reliance on municipal water supplies and minimizes runoff, ensuring that water is used more efficiently. By capturing rainwater, landscaping can thrive even during dry periods while simultaneously promoting sustainable practices that benefit the environment.

Using harvested rainwater helps maintain soil moisture without over-irrigating additional resources. It also reduces the cost associated with traditional water supply methods. Moreover, effective irrigation systems can be set up to monitor and adjust water delivery based on weather conditions and plant needs, further enhancing water conservation.

The other options do not accurately represent the fundamental advantages of irrigation systems in landscaping. Synthetic fertilizers are not a primary focus of irrigation but rather related to nutrient management. Irrigation does not eliminate the need for water; rather, it manages water usage efficiently. Additionally, an irrigation system that relies solely on groundwater may not take full advantage of sustainable practices like rainwater harvesting.