Which statement best describes the difference between soil-based and soilless media in horticulture?

• A. Soilless rely on inert components like peat, perlite, or vermiculite for better aeration and drainage
• B. They are not used in horticulture
• C. Soil-based media rely on inert components like peat, perlite, or vermiculite
• D. Both media types are identical in composition

Answer: (C)

The main idea here is how growing media differ in what they supply to plants. Soilless media are made from inert or non-soil components such as peat, perlite, and vermiculite. These materials are chosen for their structure—giving good air spaces and drainage—and they don’t provide nutrients themselves, so plants get their nutrients from a separate fertilizer solution.

In contrast, soil-based media use actual soil or soil-derived materials that contain minerals and organic matter. These components supply nutrients and support microbial life, but their properties can vary a lot, which affects nutrient availability and water retention.

So the statement describing soilless media as relying on inert components for better aeration and drainage is the best description of their difference from soil-based media. The other options aren’t accurate because they misstate which media provide nutrients, claim they aren’t used, or say the media are identical.