what side does a boutonniere go on

A boutonniere should be placed on the left lapel of a suit jacket or shirt. Specifically, it should be placed on top of the lapel and to the left side. If someone else is pinning the boutonniere for you, it should be placed to the right of the tie. The boutonniere is typically placed lower than the tie, but above the pocket square. The stem of the boutonniere should be aligned with the sides of the lapel so it angles in the same direction.