Why Ornamental Horticulture is Moving Away from Peat

Ornamental Horticulture: the Shift Towards New Growing Media

As the horticultural industry continues to evolve, growers are increasingly exploring alternatives to peat in growing media. We offer an overview in our guide to peat alternatives. This shift is driven by several factors, including greater attention to sustainability, concerns about the long-term availability of peat resources, and the fact that peat forms extremely slowly over thousands of years. In parallel, a number of countries have introduced, or are considering introducing, legislation aimed at reducing peat use in professional horticulture. As a result, peat-reduced and peat-free substrates are becoming an increasingly important part of ornamental plant production. While these materials can offer valuable benefits, they also have distinct physical, chemical, and nutritional characteristics that may require adjustments to traditional crop management practices.

Understanding how these materials behave is an important first step toward maintaining healthy crops, consistent growth, and reliable production outcomes.

Which are the Most Common Peat Alternatives in Professional Plant Growing

As mentioned, regulatory developments and sustainability goals have accelerated the search for peat alternatives, with growers and growing media manufacturers increasingly focusing on materials that can deliver consistent and predictable performance throughout the crop cycle.

Coir, bark, wood fiber, and compost are among the main organic ingredients that substrate mixes may include alongside traditional inorganic components such as perlite, loam, sand, and grit.

These materials should not be viewed simply as direct replacements for peat. Each has unique physical and chemical properties that influence water availability, aeration, nutrient retention, and root-zone conditions. Consequently, peat-reduced and peat-free substrates often require different management approaches than traditional peat-based growing media.

For example, many alternative materials have lower buffering capacity and reduced nutrient retention compared with peat, making careful irrigation and nutrition management increasingly important for maintaining consistent crop performance.

How Different Raw Materials Influence Substrate Characteristics

To build a deeper understanding of peat alternatives and their role in modern ornamental plant production, explore our articles on how different materials influence substrate characteristics:

Wood fiber

The successful use of wood fiber as a peat alternative depends on the specific physical and chemical characteristics of the material being used. Compared with peat, wood fiber-based substrates typically have lower buffering capacity and reduced nutrient retention, two important factors that can influence crop stability. To learn more, read our full article on how to manage wood fiber for consistent crop performance.

Bark

Bark primarily contributes to substrate structure by improving porosity, oxygen diffusion, and mechanical stability. Its effect on water-holding capacity depends largely on particle-size distribution. This article gives a deeper insight on how bark contributes to substrate’s characteristics.

Coir

Derived from coconut husks, coir can be supplied as fiber, chips, or coco peat, each with distinct physical characteristics. It is important to understand which material is being used, as nutrient content may vary and can include potassium (K), manganese (Mn), boron (B), zinc (Zn), sodium (Na), and chloride (Cl). Its low bulk density can also help reduce transport costs.

Compost

The characteristics of green compost can vary considerably depending on the source materials used in its production. Compost may contain significant levels of phosphorus (P), potassium (K), calcium (Ca), and trace elements. However, growers should also be aware of potential contamination risks, including herbicide residues or weed seeds.

Understanding the Characteristics of Peat Alternatives

As with any growing medium component, understanding both the benefits and limitations of each material is essential for achieving consistent results.

As explored in our guide to peat alternatives where we highlight how new substrates behave, besides lower buffering capacity and reduced nutrient retention,  peat alternatives can support enhanced root development, effective drainage, improved re-wetting performance, and other desirable substrate characteristics.

What matters most is understanding how these characteristics influence crop management. By monitoring key parameters such as water retention, EC, pH, and nutrient availability, growers can adapt their practices to get the best performance from each substrate component.

Successful Plant Growing Starts with Monitoring

Plants grown in peat-reduced and peat-free substrates can be just as healthy and marketable as those grown in traditional peat-based media. Success depends on

• understanding how the substrate behaves
• and knowing which parameters to monitor throughout the crop cycle.

Regular assessment of EC, pH, moisture levels, and potential nitrogen drawdown helps growers make timely irrigation and nutrition adjustments, ensuring stable growing conditions and consistent crop performance. Learn more about substrate monitoring in our in-depth guide to the measuring devices for EC, salt, pH and moisture in substrates.

Conclusion

By considering both the physical properties and nutritional implications of coir, bark , wood fiber and compost, growers can make informed substrate choices and adapt crop management practices to support long-term production success.

For personalized guidance, contact your regional technical support by visiting your country’s website or fill in the form you can reach from the banner at the bottom of this page.