Step 1, convert to B&W (via H&S desaturation). Step 2, create and save feathered selection of barn and tree. Step 3, lots of tonal adjustments to selected areas of picture. Step 4, selective soft focus via Gaussian Blur. Step 5, add ground mist on separate layer and blend to desired effect. Step 6, "hand color" (via H&S colorize) selected areas of pictures. Step 7, say "Voilà."
I started with a color picture - see original picture in entry below this one.