Each petals are made by folding squared cloths with a pair of tweezers.
Maru-tsumami and Ken-tsumami are folded the same way up to the second process shown below. After the third process, it will be different.
1. Fold up and make triangle. (Make sure to match corners of the cloth.)
2. Fold down and make small triangle. (Make sure to match corners of the cloth.)
3. Pinch little bit above the corner.
4. Spread bottom two layers to the upper single layer and match three corners.
5. Adjust the petal.
This describes Starch glue method. The way of fixing petals depends on the method.
On this website, we have information for the starch glue method, craft glue method and sewing method.