Classification
Some botanists place the plants of the genus Calibrachoa in the genus Petunia. In botanical classification, tobacco, tomato, potato, and petunia are all in the family Solanaceae.
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.
The tubular flowers are favoured by some Lepidoptera species, including the Hummingbird hawk moth. The flowers are eaten by the larvae of the corn earworm, Helicoverpa zea and the cabbage looper, Trichoplusia ni.
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