Step 1:
Prefold in half.

Step 6:
Fold one edge straight upwards.

Step 5:
Fold over these prefolded lines, into a base shape.

Step 2:
Fold both corners to the prefolded line.

Step 4:
Prefold in half over these three lines.

Step 3:
Fold along the edge.

Step 10:
Press these edges downwards / flat.

Step 8:
Prefold over these two lines.

Step 9:
Fold this edge downwards.

Step 7:
Squash-fold, see purple arrow.

Step 16:
One flower is done.....

Step 15:
Repeat steps 13 and 14 on the other two petals.

Step 12:
Fold the three petals sidewards.

Step 11:
Fold the triangle flap upwards. Then repeat steps 7 to 11 on the other two large flaps.

Step 14:
Press the petal flat and curve it downwards.

Step 13:
Fold both edges outwards.

Step 21:
Fold over these two lines.

Step 19:
Fold over these four lines.

Step 20:
Fold over these four lines.

Step 18:
One paper is for the leaf and the other's for the stem. Fold the stem paper in half about 4 times.
And prefold the leaf paper in half.

Step 17:
Prefold and cut an a4-size paper / standard printer paper in half.

Step 22:
Fold over these two lines (not really necessary).

Step 23:
Glue all three parts together and curve the stem a little.