I will soon move to Okinawa, Japan, where I hope to plant a lush flower garden (my first!). Okinawa has a subtropical climate. I would like to know if you can help me determine which flowers will do well (and which will not) in such a climate. These are flowers that I am considering planting there:

petunia
pansy
begonia
hollyhock
Sweet William
cockscomb
Cosmos

shell flower / shell ginger / pink porcelain lily / light galangal (Which name is most common?)

kahili ginger (Can this flower be planted in a garden, or does it only grow
in the wild?)

May I ask whether you can identify any of the flowers pictured (the photos
do not appear to be labeled with names):

I really do appreciate your help! Thank you so much!

Sincerely,

Richard Tyler