LECA (Lightweight Expanded Clay Aggregate) is becoming one of the most popular and versatile substances in horticulture. As a soil component or medium, it retains moisture while providing excellent drainage for excess water. Use as a soil topper for a unique desert theme! LECA (Lightweight Expanded Clay Aggregate) is becoming one of the most popular and versatile substances in horticulture. As a soil component or medium, it retains moisture while providing excellent drainage for excess water. Use as a soil topper for a unique desert theme! Terrain is a garden and home brand deeply rooted in nature and plant life. From weather-ready planters and outdoor furniture to artisan-made wreaths and hand-poured candles, their curated product assortment explores the boundaries of life lived outside and in. With a globally conscious, locally influenced point of view, Terrain offers inspired seasonal solutions for creative living, gathering, and gardening.