I have used Miracle Grow Plant Food for years.  It is very easy to use and formulate.  It has always made a significant difference in the way my plants grow.  I did an experiment with my class and we used Miracle grow on one garden and used nothing on the other.  We planted the same plants in the same soil with the same lighting.  The ones that got the Miracle Grow actually grew faster and fuller.  It must really work!  Ever since our experiment, I have been a firm believer in Miracle Grow products.  I will continue to use them and highly recommend them.