The flower for the birth month of October is generally considered the Marigold or Calendula.
An annual flower that can be used for nutritional or medicinal purposes, they come in a variety of shades of yellow, orange, red, maroon or a combination.
Marigolds are referred to as the "Herb of the Sun" and symbolize passion, creativity and protection. They were often used for love charms.
Other flowers associated with the birth month of October are Pumpkin Bloom and Cosmo.
This was part of a custom tattoo design I did using Marigolds to represent the October birth month.