The Garden Rules Lyrics

Lyric discussion by alwaysxloved 

Cover art for The Garden Rules lyrics by Snow Patrol

"Deep in your garden where the nettle met the rose"

That is obviously a metaphor for sex.

No. (Nor is it suicide or drugs). The song is about an innocent first love of youth.

Obviously it literally means at the end of the garden (yard), just beyond the cultivated area in the bushes. If there's a metaphoric sense to it, the narrator is a nettle to the girl's rose.