|PETUNIA x hybrida - Petunia|
Solanaceae; of hybrid origin.
Germination: Best sown indoors at a temperature of 70-75°. Sow 10-12 weeks before last frost and expect germination in 10 days. In order for seeds of double-flowered or F1 hybrids to germinate, they will need a temperature of 80°. In either case, sow with no cover as light aids in germination. Petunia seeds are some of the only seeds that can be germinated in full sun. It is not recommended to sow seeds outdoors.
Growth: Transplant when there are at least two sets of true leaves. For best results, grow on under full sun at 65-75° days/62-68° nights, however plants are tolerant of higher and lower temperatures. Plant out after danger of frost is past at 12 inches apart in full sun and a rich, light, sandy soil with excellent drainage. To keep plant growth in check, pinch plants back when 6 inches tall and again after the first flush of flowers. Feed monthly with a balanced fertilizer. The single-flowered forms will tolerate alkaline and poor soils; the multifloras are more weather tolerant than the grandifloras. For conservatory culture: site in full sun, maintain 50° nights, and allow the soil to become dry between waterings.
Appearance and Use: Used in containers, hanging baskets, bedding, borders, and greenhouses. They are vigorous plants growing 10-18 inches tall and spreading to 3 feet. From summer to frost they are covered in slightly fragrant, funnel-shaped, double or single flowers that are bi-color or solid colors of violet, blue, red, pink, salmon, or white.
NASA Seeds in Space
Excerpted from the Foreward, by Jim Wilson, of Karen Park Jennings' book, Success with Seed
"I hope that you will use the solid, time-tested information in this book to launch you on a lifetime hobby of starting from seeds. One of the fringe benefits that will grow from it will be a yearly surplus of seedlings...Neighbors will come to see you as a cross between the Easter Bunny, Santa Claus, and Johnny Appleseed.."