In my post Fertilizer: Selecting the Right NPK Ratio, I explained that you don’t feed plants – you feed the soil. Your job as a gardener is to add missing nutrients to the soil. If the soil contains all the nutrients plants need to live – the plants will do well.
The answer to the question, what fertilizer do plants need, is very simple. They need any nutrient that is deficient in the soil. If your soil is not deficient of nutrients – you do NOT need to fertilize.
But how do we know which nutrient(s) is deficient in the soil? I’ll try to answer this question in this post. In order to do that, we need to better understand what nutrients do in the soil.
