The best flower by far to symbolize summer is the sunny Helianthus, commonly known as the sunflower. Its round head, with bright yellow petals, makes it perfectly clear why the flower is referred to as sunflower. Helianthus even comes from the Greek words Helios (sun) and anthos (flower). Originally, all sunflower species originate from North America, with the exception of three species coming from South America. If you want to know how to enjoy your sunflowers longer, then be sure to follow our tips below!