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Have to agree with you Alex, it is something that looks unsightly and spoils an otherwise good image.
Irrespective of how agressively you feather, you still get the dreaded halo. I just thought that it might be an idea to actually select the rose, then cut (not copy) and paste it on to a new layer. Go back to the original, now minus the rose. Reselect all, expand by a few pixels to get it to actually go in to the area previously occupied by the rose. Apply blur. Go to layer with the rose, then simply cut and paste back in to the original.
Obviously, I know nothing about paint.net, therefore do not know if it supports layers.
Alternatively, select the halo, then specifically select the colour of the halo. Once that is done, go to hue/saturation and desaturate the colour.
As a second alternative (albeit labour intensive) use the sponge tool on its 'desaturate' setting.
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