I use the Better-Gro product line because it is similar to the MSU formula and much easier and cheaper for me to procure. The instructions call for a teaspoon/gal watering weekly. I usually mix weaker than that and from time to time do a wash-out with just water.
I really like the colors on this one. I have seen similar flowers for sale in the past, and I've always been tempted to get one because of the great color.