Used as a top dressing, black pebbles improve soil drainage, help suppress unwanted weed growth, and act as a durable, cost-effective alternative to organic mulch that won’t decompose.

Many listings describe a polished surface—terms include “Smooth Polished Finish” and “Polished Wax-Coated Finish.” Some pebbles are noted as being coated with paraffin wax to enhance gloss and color.