River Rock Under Spruce: Heat Reflection Concerns

River rock under a 30-foot spruce in Omaha can increase soil temperature by absorbing and radiating heat, potentially stressing shallow roots. If lower branches shade the rock, risk is lower. Mitigate by interplanting ferns or shade perennials among the rock to absorb heat and improve aesthetics.

Mulch (wood chips) is cooler and builds soil organic matter. If keeping rock, ensure deep watering to offset evaporation.