Ochi wrote the lyrics for the song after reading the script for the drama, and was inspired by the stoic story-line and language.

[6] The single's jacket features vocalist Shiho Ochi holding a different object representing each song on the single: a dahlia flower for "Wildflower", a djembe drum for "Tamashii Revolution", a globe for "Free Planet" and on the back cover a rainbow for "Roll Over the Rainbow".

[13] It features scenes of Ochi in a Western-style prairie, standing in wooden farming structures and next to a windpump.

Hirokazu Koike of Rockin' On Japan praised the song developing from its minor chord progression into a bold chorus.

He was deeply impressed by the song's ability to make you feel a sense of a tough life force.

[14] CDJournal reviewers described "Wildflower" as a "medium" rock song, that was simple and driven with strong vocals.