What do Numbers on Fertilizers Mean? The numbers on the fertilizer bag can be intimidating. What does NPK mean, and why are the percentages significant? Do different plants need different breakdowns? You may be asking, what do numbers of fertilizers mean? Continue reading to learn more about the numbers on fertilizers and how and when to use certain combinations. NPK On all fertilizer bags, one will find the fertilizer grade or the breakdown of the … Continue reading →