During Día de los Muertos, altars are typically adorned with marigolds, known as "cempasuchil," which symbolize the connection between the living and the dead. These bright orange and yellow flowers are believed to attract the spirits of the deceased. Other flowers, like roses and carnations, may also be used for decoration, adding vibrant colors and fragrant scents. Each flower serves to enhance the altar's beauty, creating a festive yet respectful homage to loved ones who have passed away.