turvemulta

Turvemulta is a peat-based growing medium used in horticulture and agriculture. In Finland and other Nordic countries, turvemulta refers to a substrate primarily composed of peat and often blended with mineral soil (multa) or other materials to improve structure and drainage. It is commonly used for seedling production, potting mixes, and greenhouse cultivation.

Production and composition: Turvemulta is derived from peat harvested from bogs. The peat is dried and milled and then mixed with mineral soil, sand, perlite, or compost to adjust texture, water retention, and aeration. Some formulations include slow-release fertilizers or liming agents to modify pH and nutrient availability. The exact blend varies by intended use and supplier.

Properties: Turvemulta is high in organic matter and has a high water-holding capacity with relatively low bulk density. It tends to be acidic, which can benefit acid-loving plants but may require fertilization and occasionally liming for others. Nutrient content is generally low, so routine fertilization is common. Over time, peat decomposes, which can reduce porosity and drainage if the medium is not refreshed or supplemented.

Uses: It is widely employed for starting seeds, rooting cuttings, and growing potted plants, bedding plants, and various greenhouse crops. Turvemulta provides a forgiving environment for young roots due to its moisture retention and aeration properties, though it often requires management of nutrients through fertilization.

Environmental considerations: Peat extraction impacts peatlands, releasing stored carbon and affecting biodiversity. As a result, many growers seek peat-free or peat-reduced substrates made from alternatives such as bark, wood fiber, compost, coconut coir, or mineral components. Regulations and sustainability initiatives aim to reduce peat use and promote alternatives.