The festival in Spain that celebrates the arrival of spring with flower battles is called Las Fallas. This vibrant festival features elaborate floats made of papier-mâché that are paraded through the streets before being set on fire. Local residents engage in flower battles, where they throw flowers at each other, creating a playful and colorful atmosphere. Las Fallas is known not only for its spectacular displays but also for its celebrations that embrace community spirit, art, and tradition.