Flowers, petals and leaves are handmade which makes each flower unique and special. 
Flowers with stem made of porcelain - high complexity work.
Some of them are one-of-a-kind objets d’art.  
Porcelain. Firing 1240°С (2264°F) - 1280°С 2336°F
Flowers can be very identical, however it's very complicated to make an exact copy.
These are examples of porcelain sculptures in flower forms. This is a samples of the variety available.