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Petunia seeds germinate in 5 to 15 days. Petunias can tolerate relatively harsh conditions and hot climates. They need at least five hours of sunlight every day. They grow well in low humidity, moist soil. Young plants can be grown from seeds. Petunias should be watered once every two to five days. In drier regions, the plants should be watered ...
"They're easy to grow from seed, and are very interesting flowers," says Hillcock. They also hold up well as cut flowers, with blooms that can grow 6 to 8 inches. Zones: 3 to 8; perennial in 9 to 10
Petunias are generally insect pollinated, with the exception of P. exserta, which is a rare, red-flowered, hummingbird-pollinated species. Most petunias are diploid with 14 chromosomes and are interfertile with other petunia species, [ 9 ] [ 10 ] as well as with Calibrachoa .
"Take note of seeds that need to be started indoors, such as tomatoes, peppers, onions, impatiens, petunias, and geraniums, and plan accordingly," he adds. Grow a Balcony Garden Getty Images
Indoor plants lifted your spirits during the colder months—but now, as the weather warms, it’s time to turn your attention to the exterior of your home. You... 15 Great Balcony and Patio ...
Ruellia simplex is an evergreen perennial growing 3 ft (0.91 m) tall, forming colonies of stalks with lance-shaped leaves that are 6 to 12 in (15 to 30 cm) long and .5 to .75 in (1.3 to 1.9 cm) wide. The flowers are metallic blue to purple, trumpet-shaped with an about 2 in (5.1 cm)-wide, five-lobed corolla .