Also known more properly as Nippon Daisies, I have a planting of this stuff. I hadn't noticed it flowering last year and had planned on ripping it out this fall not knowing what it was other than being an undesirable (for me at the time), but it bloomed this fall and I rather like it and learned a bit more about it.
I know that this plant is recommended to be divided in the spring, and also that the plant does well from being pruned apparently around June in the northern hemisphere, but I don't really know the proper way to handle this for this plant.
The question is how do I properly divide this plant?
In the answer I am interested in information about cutting back when I am doing so, and to how thinly I can divide this plant without weakening it.