Final answer:
The second most common botanical used in most gins after juniper is coriander, imparting citrusy and nutty flavors to the spirit.
Step-by-step explanation:
While juniper is the key botanical in gin, offering its distinctive piney flavor, the second most common botanical used in most gins is coriander. Coriander provides a citrusy, nutty flavor and is often found alongside juniper in the distilling process of gin. Besides juniper and coriander, various other herbs, roots, and floral notes might be included to give each gin its unique flavor profile.