Ron, I have only one product labelled "Miracle Gro" in the shed at the
moment . . . but it is "Miracle Gro Lawn Food" - mainly nitrogen.
Online I see there are a number of different "Miracle Gro" products.
You probably mean the general all-purpose one?

http://www.plantmenow.co.uk/acatalog...lant-food.html

Eddy.