For myself I hold no preferences among flowers, so long as they are wild, free, spontaneous. Bricks to all greenhouses! Black thumb and cutworm to the potted plant!
I write when I have to; I write when the song is done and I deal with the idea and I just go with it and I'll become what that song is all about until I have finished it. And when you do that, it makes the song more visual, it makes it more personal.