• Composition: crushed spongilit, crushed expanded clay, and peat
• Intended use: for undemanding plants such as mosses, sedums, and certain other drought-tolerant perennials and grasses that can go without watering for long periods
• Layer thickness: 4–20 cm
• Advantages: very good water retention capacity and sufficient permeability
• Weed-free – components free of germinable weed seeds are used in production

Delivery options: bulk, big bag, blown

The Extenziv Premium Spongilit roof substrate has a low nutrient content; for spring planting, it is recommended to incorporate a starter dose of NPK fertilizer into the growing layer, ideally with a long-term nitrogen source that is released gradually to meet the plants’ needs over a period of 1 year. Garden Boom Green Roof Fertilizer for Green Roofs, 15 kg.