The trailing petunia (Calibrachoa x hybrida) belongs to Solanaceae (the Nightshade family). It is a perennial herb with a short lifespan, and a cultivar of the genus Calibrachoa, Suntory in Japan succeeded in crossing for the first time in the 1980s, and the first cultivar "Million Bells" was sold in 1992. Today, numerous horticultural species are being produced. This herb can reach 10 to 30 cm in height, and the stems are much branched and crawl and spread. The leaves are small lanceolate, pale green, glandular and sticky. The small tubular flowers with a diameter of 2.5 to 3 cm come in bloom from April to November. The flower color is very rich.