Question about Plant Food.

Lets assume all the following is for the sake of discussion.

Say a plant started, and has been growing, in Terracycle Worm Poop potting mix. To the point where it is a week or two into flowering. The nutrients in it are .82%/.2%/.2%.

Lets also say, that the options in terms of plant food is none, or just Mircale-Gro All Purpose Plant Food.

Would it be recommended to use the plant food? It has 24%/8%/16%....which seems a bit high in the potasium (actually, it says potash, same thing?). And should it be used steadily, or just once a week or so?

you need shit high in the phosphorus for fat bud production, the all purpose M G has high Phosphorus, use that

I just picked up the ONLY thing I could find that was close to the proportions that were recommended. It is a Rose food, pellets, and is 9 -18 - 9.

Sound good? O_O

for flowering sounds good, its high in p so sounds good