I brought a piece of an Launaea Arborescens (see also my other question) with me from Gran Canaria. The plant is part of the Asteraceae/Compositae family, according to Wikipedia "commonly referred to as the aster, daisy, or sunflower family".
Before transportation, I kept the piece for some days in earth with only little water, trying to replicate the rather dry soil in which these plants prosper. When I carefully packaged the piece, I realized that no roots whatsoever had been developed.
Is it somehow possible to grow the plant from that piece? Should I better get another piece? Or - more broadly - what is a good method of growing plants from the aster/daisy/sunflower family, taking some piece of a plant?
Unfortunately, today, someone accidentally put the piece in garbage. When I recovered it, it was covered with some milky grease, possibly yogurt, which I removed with water. I hope this didn't damage the plant. The picture was made after the accident.
Update: I now cut the piece just below the lowest node and put that in water, according to an article on bush daisies, which are of the same family.
Update 2: After some weeks, the piece had cached fungus, and I threw it into garbage.