Because there was so much detail in the flowers displayed on the left. I liked that detail and missed it in the flowers on the right. Even if the flowers on the right had not displayed any detail in the physical scene, I still would have preferred a photo with all of the characteristics of yours plus different flowers with more detail on the right. I'm sure the gardener would have been happy to accommodate you.
I tried converting using a color filter and found that no single color filter would bring out the detail in both sets of flowers while also keeping the two sets looking very different. So, I converted everything in the image using a yellow-green filter to reveal the detail in the flowers on the right. I then erased the conversion in the flowers on the left and converted them using a blue-green filter.I tried to convert the original to B&W with a B&W adjustment layer in PS instead of the different technique I applied, no good results again I was only able to get very little detail with a green filter....Do you think I lost so much information while converting because I was already editing a JPG file with less information?
Please keep in mind that I spent only about 10 or 15 minutes on this and spent almost all of that time trying (perhaps unsuccessfully) to at least partly replicate the overall look of your image.