Duplicate the image...a lot...and construct the flowers and leaves. Use Transform-Warp to change up the shapes to give some variety. Use a radial gradient overlay to give some color to the flower and a color overlay for the leaves.
Draw a simple line in a medium brown tone, bevel it, give it a pattern overlay for texture and use the smudge tool to pull out the smaller branches. Duplicate this and transform it to a smaller size then move the smaller branch into position behind the larger to complete the branches
Time to put it all together. Make bunches of leaves and put one of the flowers on top to create a bunch. Add a drop shadow to the individual bunch. Merge the first bunch or two you make and use Transform-Warp and Perspective to give you some variety.