The festival of Sukkot begins on Monday, October 6 at nightfall. It is a Mitzvah (biblical commandment) to recite a blessing and bring together the "4 Species," symbolizing the unity of all different types of Jews. These species include the Lulav, Etrog, Haddasim, and Aravot. Click link for all Sukkot related instructions.https://www.chabadeastdc.com/library/article_cdo/aid/4457/jewish/How-To-Celebrate-Sukkot.htm#Taking
This basic set contains the 4 species - lulav, etrog, hadassim, and aravot.