First you have to glue the test tube with the wood glue onto a tree slice. Then glue the small bark discs next to it so that it is at the same height as the test tube.
Next, apply the wood glue to the bark slices again and place a second tree slice on top so that everything is fixed. Now you have to let everything dry once.
When everything has dried, cover the spaces in between with the appropriate Iceland moss. Then decorate the tree slices with willow, feathers and eggs. Finally, you can now place the tulips in the test tubes.