Step 1:
Three different flower papers are used.

Step 6:
Start with the two valley-folds at the bottom right. Then the two mountain-folds, then two valley-folds again, etc. Work in the direction of the arrows. All lines are prefolded.

Step 5:
Prefold over these four lines.

Step 2:
Prefold a flower paper over these 4 lines

Step 4:
Valley-fold the corners outwards.

Step 3:
Valley-fold the corners to the center

Step 10:
This is the first fold of step 9.

Step 8:
Unfold the folds of step 6

Step 9:
Fold the center downwards over the outer line, then upwards over the next line, then downwards again, then upwards. All lines are already prefolded. While you do this,  press the outer part back into the same shape as in step 7
 

Step 7:
Prefold over these four lines.

Step 16:
Repeat steps 13 to 15 on the other seven petals.

Step 15:
Pull / fold the tip of the petal upwards.

Step 12:
Now step 9 is done.

Step 11:
This is the second fold of step 9.

Step 14:
Pull / fold the petal downwards.

Step 13:
Pull / fold the petal upwards

Step 21:
The leaf paper is a prefolded normal paper (the same size as the flower papers) cut into smaller squares along the prefolded lines.
Prefold the small square over the purple line.

Step 19:
This is the backside of the flower, use glue to keep the flower compact (if necessary).

Step 20:
Make enough flowers for one arrangement.

Step 18:
Repeat step 17 on the other seven edges.

Step 17:
Pull / fold the edge downwards.

Step 22:
Mountain-fold over these two lines.

Step 28:
The stems are long rectangular papers folded over the length a few times

Step 25:
Press the model flat

Step 26:
Press / fold both ends flat

Step 24:
Pull / fold the edge to the left at about nine more spots.

Step 23:
Pull / fold the edge to the left

Step 29:
A metal wire is inserted to make the stem stronger.
Then it's folded over the length a few times again.

Step 27:
Make enough leafs for one arrangement.

Step 30:
Bend / curve the stem a little. Fold the top sidewards, see pink arrow.

Step 31:
Glue a flower to the top of each stem and glue one or two leafs to each stem.