Petunia Flower Growing Conditions. Petunias need plenty of sun a fertile soil and shelter from strong winds. Hundreds of cultivars of petunias are available to the gardener for use in a range of garden designs.
When large enough to handle prick out plants individually into cell trays or small pots and grow on at a temperature of 50-65F 10-15C in good light. Flower colors are solid or speckled and are found in a wide range of hues. While petunias will bloom in bright indirect light they do their best in full sun.
In hot summers or milder areas of the country petunias will also do well given a little shade.
Petunias can grow anywhere from 9 inches to 1 foot tall and spread from 1 to 3 feet. While petunias will bloom in bright indirect light they do their best in full sun. 24112020 When deadheading the growing petunias remove the base of the flower to include seed removal. Double and single blooms offer a selection of solid and multi-colored flowers.