In general, I don't trust Miracle Gro products to be pure. While it sounds like a lovely mix for plumeria, Miracle Gro tends to put what they want in their products. Take soil, for example. They say it contains fertilizer but wont say the NPK. They have to sell "Organic" soil because of those who additives to basic potting soil.
Personally, I think you'd be better off making your own mix from scratch, adding to it what you want and what is good for the plant that goes in it. JMHO because you asked.
