Topsoil Vs Compost : When To Use What Growing Medium

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So when is topsoil not ideal? Well, if you’re growing plants in pots, you’ll probably find that topsoil doesn’t really provide enough nutrients. It’s fine where the plants can spread their roots and reach out for more nutrients, but when they’re confined to a pot, it’s not so good. This is particularly the case if you put lots of plants into one pot, as you do when planting up bedding plants in summer. In this case, you need a growing medium with a bit more ‘oomph’ – more organic matter, more nutrients, and possibly a slow-release fertiliser as well. In this case, you’ll need to buy compost. You can mix compost with topsoil to create your own potting compost, as many of the nurseries do, which gives you the advantages of soil – namely that it dries out more slowly and holds its structure better – together with the benefits of compost – organic matter and more nutrients, a compost made with loam or soil is often called a John Innes Compost.

You may also want to add compost when you’re growing plants that are very “hungry”, such as vegetables. They will grow better for the added nutrients, though again, you’ll still need to feed them regularly in order for them to grow properly.

So, here’s the basic rule:

  • general gardening projects = topsoil,
  • pots or hungry plants = compost.

Don't forget if you need to buy quality topsoil your already in the right place, and you can find out more about compost at our compost website.

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