A petunia comes in more varieties of colors than any other flowering plant. Part of the nightshade family, the petunia comes in about 30 species. Petunias are grown in northern gardens as annuals. Most petunias are actually perennials. Most people like petunias because they last all summer with beautiful flowers.
Petunias grow from cuttings or from seeds.
Petunias need to grow in a sunny location. The saguaro cactus is the largest cactus. It grows in the hot, dry deserts of Arizona. The seed of the saguaro is no bigger than a grain of sand, but can grow to more than 50 feet tall and weigh at least 10 tons. It can take more than 100 years to grow completely.