Step 1:
Mountain-fold over this line,
then turn the paper.

Step 6:
And fold/push the final piece downwards

Step 5:
Press this spot inwards

Step 2:
Roll up the paper

Step 4:
Push/press this spot inwards.

Step 3:
I have one finger sticked in the model here,
you can also stick a pencil in the model to
make the next steps easier.
Press/push the spot indicated by the arrow
inwards.

Step 10:
Valley-fold in half one more time.

Step 8:
Press the green part flat between your
fingers by making a mountain-fold over
these 2 lines.

Step 9:
Valley-fold the green part in half.

Step 7:
Now the model looks like this,
turn the model

Step 16:
Valley-fold over these 2 lines.

Step 15:
This paper is for the leaves.
Valley-fold over these 2 lines.

Step 12:
One berry is done....

Step 11:
Press/push the edges of the blue part
inwards with a finger, see arrows as
example.
Finally curl/bend the green part a little.

Step 14:
Glue a few berries together and glue this
bunch to a stem, see arrow

Step 13:
I made about 50 berries for one completed
plant.

Step 21:
Press the tip of the leaf flat between your
fingers, see pink arrows.

Step 19:
Pull the corner to the left by making
a valley-fold over the line on the left and
a mountain-fold over the line on the right.

Step 20:
Repeat step 19 three more times.

Step 18:
Prefold in half over this line.
Then turn the model.

Step 17:
Valley-fold over these 2 lines.

Step 22:
I made about 50 leaves for one completed
plant.

Step 25:
I made 3 long stems and placed them in a
pot, then I glued a few shorter stems to
them, see next picture.
You can also tape the stems together,
instead of using glue.

Step 24:
Insert a metal/florist wire in the stem.
Then fold it in half over the length one
more time.
Bend/curve the stem on a few spots,
see next picture as guidance.

Step 23:
Use long rectangular papers for the stems.
Valley-fold over these 2 lines.

This DIY video also has instructions for the Blueberry plant: