Petunias and Surfinias are two plants that can be perfectly confused. Both plants are the same, since one is a hybrid of the other. Both are characterized by having an abundant flowering, from spring to autumn. In addition, its leaves are green, small, somewhat sticky and hairy.
We can find flowers of all colors, from deep red to bright white or a combination of both. These flowers have a flared shape and give off a rich aroma. It is the most attractive of the plant, because it has so many flowers that they practically cover the leaves. Due to this, the withered flowers must be eliminated so that new ones appear.
The Petunia and the Surfinia however, they are not exactly the same, although at first glance yes. The Surfinia is a hybrid of the Petunia. Therefore, the Surfinias have sterile stamens and do not give seeds but can be multiplied through cuttings. However, the Petunia does give seeds, this being its best form of reproduction.
Furthermore, the surfinia It usually gives many more flowers than Petunias, although they are usually somewhat smaller. Even the Surfinia are known as «Hanging petunias» because they tend to fall above the pot where they are planted hanging. The Petunias are somewhat more creeping, but they can also hang.
Both plants stand the sun directly but require a lot irrigation, although it must be borne in mind that the flowers should not be wet, as they spoil. They can also bear the cold well and can last from one year to the next, although it is not convenient, as old plants flourish worse. It is best to collect the seeds of the Petunias and sow them the following year.
Personally, the Surfinias are better because they are prettier when it comes to putting them in the balconies, however Petunias are cheaper and if you collect the seeds, you don't have to buy them again.
More information - Grow hanging plants.
Source - infojardin.com