Makes a big difference.  I feed my plants mostly water from fish tanks.  That is likely higher in nitrogen.  This provides a nice boost to make the flowers blossom.  I don't think it is possible to overdue this product unless you don't follow the directions.  If you have flowers, then you want them to flower, and this stuff helps a flower flower faster and better and more reliably than any other food.  What makes this food so effective is that you don't have to wait for it to dissolve.  It is in the water, so the plant gets a direct and immediate shot of the minerals it needs.  Its like you getting an injection of vitamins as it travels directly up the vascular system of the plant.  This also does not last long and needs weekly or bi-weekly applications.  It's not hard to add it to the water you use.  So if you are growing flowers and want them to flower then feed them this food according to directions.  For some flowering plants this might be good for the duration of the time you fertilize your plants.  Maybe the regular Miracle Grow would be better in the non-flowering stages of growth.  I don't think this fertilizer has any effect on the micro-biome such as mycorrhizal fungi or beneficial bacteria.  I've used it for 40 years and it's always worked for me.