Gunna start flowering today or tomorrow, picked up some 15-30-15 flowering dry fert

I bought the Vigoro Bold Blooms for $4, figured I'd give this a try.

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For roses it says to use 1 1/2 tsp per rose, 1 Tbsp per 9 square feet. So I know that higher numbers typically have a bigger rate of burning if incorrectly used at a good level, so you think I should ease in with 3/4 tsp sprinkled and lightly mixed into the soil and then watered well and add a little more 2 weeks later?
 
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