Petunia is genus of 20 species of flowering plants of South American origin.
The popular flower of the same name derived its epithet from the French, which took the word petun, meaning “tobacco,” from a Tupi–Guarani language. An annual, most of the varieties seen in gardens are hybrids (Petunia × atkinsiana, also known as Petunia × hybrida).
Petunias can tolerate relatively harsh conditions and hot climates, but not frost. They need at least five hours of sunlight every day and flourish in moist soil and conditions of low atmospheric humidity. They are best grown from seed. Watering once a week should be sufficient in most regions. Hanging baskets and other containers need more frequent watering. Maximum growth occurs in late spring. Applying fertilizer monthly or weekly, depending on the variety, will help the plant grow quickly. Petunias can be cultivated in hanging baskets.
In horticulture many terms are used to denote different types of cultivated petunias. These include Grandiflora, Multiflora, Wave (Spreading), Supertunia, Cascadia, and Surfinia.