Here is the top 10 list of favored flowers in Japan (in 2010).
Suntory made blue roses with their genetic engineering. To see it, click http://www.suntorybluerose.com/.
No.2 Cherry tree
This is a tree of spring.
No. 3 Lavender
This is a flower of Hokkaido district.
No. 6 Tulip
No. 7 Gypsophila
No. 8 Hydrangea
I am not sure you are familiar with hydrangea. It is a common flower as "flower of June" in Japan.
No. 9 Clematis
No. 10 Viola
Survey was conducted by irisoyama.
The following is the table format list.