how is this background made?

Looks like most of the shots are done with other flowers in the background, but with the bokeh from doing a close-up shot with a relatively large aperture.

Interesting that 99% of the shots are of flowers, my 500px site also has only flowers.
This background Image is created buy Water Effect in Photoshop
I would suggest the image maker used a Macro, or close focus lens, and was very, very close to the flower and water droplet..

A shallow depth-of-field is more about the point-of-focus distance than about the lens aperture.
macro shot and then over-worked post-processing. nothing more.

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