Fertilisers provide plant nutrients. But what nutrients do your plants need and how do you know what to use?
I should mention right up front that this article has been a long time in the making. There has been much debate at Quest for Veg HQ about what to include and how to make it easy to understand. We have tried to produce a simple, readable guide to a complicated and sciency area. If you have any questions or suggestions, please let us know.