Averil,
I have used it a few times on a couple plants that needed some help.
Having said this, I truly do not know how it works and some people I am told swear by it and others think it is voodoo.
It states on package directions that it is to be used in conjunction with other fertilizers or separately to help rejuvenate a sickly plant.
I used iron two stubborn Adenium plants I received bare root. It seemed to help. It was worth a try at the time as I did not want to lose them.
Rick

Thanks Rick, I don't think I shall bother with it then. I shall just continue feeding with miracle gro
Kind regards
Averil