Petunia Flower Size. 19042018 Keep in mind its recommended to plant petunias 12 inches apart if theyre going in a bed and 10 inches apart if theyre going in a container. Be sure to add organic matter to each hole to give the petunias their necessary nutrients from the start.
31032019 The differences are about flower size and plant behavior. 27072006 QTL of small to moderate effect control the differences in flower size and volume of nectar. The mature size of the plants is generally about 8 inches 205 cm tall and wide.
If you plant them in a container make sure to use an extra-large one.
Some have a pendulous cascading habit that makes them more suitable for hanging baskets and window boxes but most are upright plants that develop over the summer into large mounds of flowers which are 12 to 15 inches tall. Grandifloras are the most common with their usual big flowers and plants that grow upright from 8 to 12 inches high. The mature size of the plants is generally about 8 inches 205 cm tall and wide. Of all petunias these produce the fewest but largest flowers 3 to 5 inches across.