Duplicated layer, used magic wand to select the amaryllis, then used selection tool set to delete the two flowers on the side.

Feathered by 8, then sent to its own layer, selected background layer, used paintbrush set to white and painted out the cement wall and 2 other amaryllis flowers.

Used magic wand to select the stem, duplicated, set to soft light and played until I got the color you see!

Merged all visible, duplicated, set blend to Color, used HighPass filter to sharpen slightly. Flattened image.