Digging Deeper into Growing Media

Clay-based soil? Soil-less? Get the low-down on improving growing mixes in local landscapes

- Wilson Wong

grow. It should be loose enough to permit root development and growth. The growing medium also plays an important role in ensuring the roots get sufficient air, water and nutrients.

The type of growing medium used will vary depending on the plant species, its growth requirements and prevailing growing conditions, as well as the gardener's care regimen and budget.

It is important to understand your growing medium's characteristics to ensure you select the most suitable one for your plant.

WHAT IS A GROWING MEDIUM?

A growing medium consists of inorganic and organic components. The proportion of these two components and how they combine determine the medium's characteristics.

In soil that is found naturally outdoors, the inorganic component consists of a mixture of particles of varying sizes, from large sand grains to minute clay. Sandy soils have a large proportion of sand, making them porous, and water will easily drain away.

Clay-based soils, which are common here, are known for their density and high water retention. The clay particles are very small and closely packed together.