Tulsi is believed to be a physical incarnation of the Goddess Lakshmi, she is worshipped every day for peace and prosperity.
Moreover, the sacred plant helps people eliminate Vastu Dosha, if any. In ancient households, a Tulsi plant would also find a special place for worship. People would do parikrama (circumambulate) to pay their respects to the Goddess. The presence of Tulsi helps in warding off evil and negativity.
The Tulsi or the Vrinda is believed to be the gateway to heaven or Vaikuntha, the abode of Lord Vishnu. And therefore, she helps devotees in getting closer to their ultimate goal, Moksha (liberation from the vicious cycles of birth, death and rebirth).