Adjusted first with levels, then desaturated all the channels except the red, masked out some of the building background and removed the color. Saturated the reds, did brightness & contrast, then burned the whole image.
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In order to make a good selective desat photo, you need to start with a good shot to make b/w. To make a good b/w shot you need to start with a shot that is exposed for good highlights. In this example your highlights are way blown out ruining the effect that you are trying to achieve.
TC
In natural color, I bet this is a beautiful photo, but the flowers are just too small and lack detail to make a real impact in this challenge. The desat itself is OK - I don't know which technique you used - but it's just lacking that "wow" factor.