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Scientific Name: Petunia hybrida (Hook.) Vilm.
Family: Solanaceae
Petunia (Petunia  hybrida)
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Recommended Temperature Zone:
sunset: All zones
USDA: All zones

Frost Tolerance: Semy hardy in Phoenix, but killed by summer heat

Heat Tolerance: Killed by the summer heat in Phoenix

Sun Exposure: Full sun

Origin: South America

Growth Habits: Tender perennials grown as half-hardy annuals, up to 12 to 24 inches high (30-60 cm), 12 to 24 inches in diameter (30-60 cm)

Watering Needs: Regular water, good, well drained garden soil

Propagation: Seeds

Petunias are generally classified in 3 categories:
  • Grandifloras have very large flowers, up to 5 inches in diameter (12 cm). They are generally grown in containers because the flowers are rather fragile.
  • Floribundas have 3 inch flowers (8 cm)
  • Multifloras have large quantities of durable 2 inch flowers (5 cm)
Petunias are largely used in flower beds. They can be used by themselves, or as accents with other annuals and perennials. Petunias are also great container plants.

Petunias make wonderful flower displays in Phoenix too, the main difference with the rest of the country is that in Phoenix, they should be planted in the fall. They grow slowly during the winter and bloom heavily starting at the end of February. In Phoenix, they start failing in May, and should then be removed to leave space for summer annuals.

Cultural Practices:
Petunia seeds are small and difficult to handle. It is probably simpler to buy already grown plants. If you decide to go ahead and start seeds in a warm place at 70 to 85F (21 to 29C). Plant 8 week old seedlings 12 inches apart (30 cm). In colder winter areas, plant the petunias after the last frost date. Remove spent flowers to promote rebloom.

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