|Pic courtesy : Expo2016Antalya|
Petunia × atkinsiana (synonym: Petunia × hybrida) is a plant nothospecies, including all hybrids between P. axillaris and P. integrifolia. Most petunias cultivated in gardens belong to this nothospecies.
Floral arrangement of petunias in Columbus, Ohio
P. × atkinsiana plants were originally produced by hybridisation between P. axillaris (the large white or night-scented petunia) and P. integrifolia (the violet-flowered petunia). P. axillaris bears night-fragrant, buff-white blossoms with long, thin tubes and somewhat flattened openings. The scent molecules emitted by the hybrids are generally similar to those from P. axillaris.
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 daily. Dead petals should be pruned so that the younger branches can flourish. Maximum growth occurs in late spring. Applying fertilizers once a month will help the plant grow quickly. Petunias can be cultivated in hanging baskets.
This type of petunia has the largest flowers, up to 4 inches (100 mm) in diameter. Of all the petunias these have the widest variety of forms and colours but are the most likely to be damaged by heavy rain. There are four types of grandiflora and they are classified by their colours: ‘Daddy Series’ (shades of pink and purple), ‘Merlin Blue Morn’ (blue and white), ‘Supercascade Series’ (many colours) and ‘Ultra Series’ (many colours, including bi-colour).
Hedgifloras or spreading petunias (sometimes called ground-cover) are characterised by their low height (usually about six inches), but they have a large spread (about three to four feet). They will cover a large area, provided they have adequate water and fertilization. ‘Purple Wave’ was the first introduced cultivar of spreading petunia and grows to a height of 4 inches (100 mm). ‘Tidal Wave’ is another spreading type of petunia, but is much taller (between sixteen and twenty-two inches). 'Surfinia' petunias are another type of spreading petunia propagated by cuttings. ‘Opera Supreme’ is a cultivar with large flowers.
Multifloras are half the size of grandifloras, being 2 inches (51 mm) in diameter. They are not easily damaged in heavy rain and are more sun-tolerant. Multiflora petunia cultivars include: 'Carpet Series "(many colours) and 'Madness Series' (many colours). They spread quickly and are ideal for baskets.
Millifloras are the smallest of the petunias, being about 1-inch (25 mm) across. These are commonly mixed with other plants in containers, along garden beds and edges. Millifloras are available in 'Fantasy Series' (red, purple, pink) and are the easiest to find. 'Supertunia Mini Series' (blue, pink, lilac, purple and white) are also available in the milliflora category. They tolerate harsh weather better when compared with grandifloras and multifloras.
A common descriptor is Picotee, meaning that the edge of the flower is a different colour to the base, as in ‘Fortunia Pink Picotee’.
Source : http://en.wikipedia.org/wiki/Petunia_%C3%97_atkinsiana