Hello and thanks to everybody!
The Hexi side length is 0.8 inch. I didn't measure the whole Quilt but already used it and it is big enough.
There is no pattern for this design. At first I wanted to make a plain or traditional Flowergarden and started with the center flowers. I did not realize how much fabric this all takes and ran out with the green colour fabric. Then I wanted to stop and make it a wallhanging. Then I was unsure about all and put it away. And then I started to play with the Hexagons, tried many kind of edges, piced and cut off again, till I liked it.
I could imagine that maybe one day I start with a new Flowergarden.