Can I use a fertiliser meant for tomato plants (9 6 15) for other crops that require 15 15 15?

Question

I am using potting soil for flowers I bought from a store.

Answer 1

Yes, but use it sparingly.  If it is granular, disperse it in rain water first, then water it on.

Answer 2

yes you can but dont expect it help other to the same degree as it would for tomatoes.

you can apply any of the fertilisers to each plant they will not kill the plants, but they may not improve the plants