Plant roots in a container have access to a much smaller volume of substrate than they would when grown in the soil therefore the air and water capacity of the medium used is much more critical.
The GMA and its members are committed to the provision of high quality growing media for the millions of containerised plants grown in the UK every year, whether they are grown by gardeners on their patios or by commercial growers.
If you chose the right growing medium for the plant type and growing situation you are making a good start towards... Read More >>
The term ‘substrate’ is also used and means the same thing. In the UK some people still use the term ‘compost’ in the same context, however a compost is technically the product of a composting operation (eg the compost heap at the bottom of the garden) and can therefore be a misleading word to use. A composted material may be a component of a growing medium but peat is not a product of composting and nor are many other ingredients we use. In Holland the term ‘potting soil’ is often used instead of ‘growing... Read More >>
Another word for this is ‘soil conditioner'. The term ‘soil improver' in the UK also includes materials used as surface mulches such as bark, used to prevent weed growth and to conserve soil moisture.
Soil improvers are generally used to improve the soil fertility by increasing the soil organic matter level. They improve the workability of the soil over time, for example making heavy clay soils more manageable and they can be used to improve the water holding capacity of light soils. This is becoming increasingly important in... Read More >>
Making a compost to use as part of a home-made growing medium to use for raising plants in pots requires a bit more skill. For this you will have to be more careful choosing what you compost (avoid any diseased plants and weeds with seeds), compost it for longer and the compost may need sieving before use. It will be too heavy and have too many nutrients to use on its own in a pot so will have to be diluted with coir fibre, fine bark or peat (use compost as a third to a half of the mix). It is often better to use a home-produced growing medium... Read More >>