I have some Miracle Grow Nursery Select (formally Miracle Grow Patio) that I was planning to use. It's 20-20-20 here's the link.

Miracle-Gro® Nursery Select All Purpose Water Soluble Plant Food : Product : The Scotts Miracle-Gro Company

Is this stuff ok to use...if it's NOT...could someone please let me know what I should use, preferably something that is widely sold, sometimes I have trouble finding some of the specialty stuff.