Heavy, angular, and endlessly useful, horticultural grit is a go-to for boosting drainage and weight in soil mixes. Its sharp edges help prevent compaction and improve airflow, especially in blends for succulents and cacti. You can also use it as a tidy top-dressing or to stabilise taller, top-heavy plants. Unlike lighter components, grit stays put, making it a dependable choice when structure and drainage really matter.