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Question about the NPK in fertilizers


Firstly apologies for all the questions on the forum recently. I am new ish to gardening and there are questions I have but I can't find the answers online.

I want to grow a clematis and I saw a video from that you should add bonemeal to the planting hole. They said bonemeal promotes strong roots and more flowering as it is high in phosphorus. I also read that postassium promotes strong flowering in things like fruits and roses and that they should have a high potassium fertilizer.

So what is the difference between phosphorus and potassium? If they both promote strong flowering, why use one over the other?

Craigh image


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