Oh that's a good point

Maybe it's a farm or greenhouse with plants in different stages of growth?

It might be shopped. Take a picture at each stage, then arrange them all on a background.

New flowers and berries can still be growing while some are fully grown, especially if part of the plant is in shade but not all of it.

What you need is a whole bramble! Ive never seen a blackberry bush as such, but an entire wall of plants? Yes. They'll continue to produce steadily for weeks/months.

Could have taken the pictures over time and combined them with GIMP or Photoshop.