Not all petunias flower on the same schedule.
While the potential season is nearly 5–6 months long, several variables determine whether your petunias actually achieve this: when do petunias flower
The petunia flowering season can be divided into three distinct phases: Not all petunias flower on the same schedule
Petunias are photoperiodic . They require long days with ample sunlight to bloom profusely. Because they are "tender perennials" often grown as
Because they are "tender perennials" often grown as annuals, their exact flowering schedule depends on your local climate, when they were planted, and the specific variety. The Typical Flowering Timeline Planting and Growing Petunias - Farmer's Almanac
A common complaint in reviews of petunias is the "mid-summer slump." Around July or August, plants often look tired, leggy, and sparse.
Petunias are one of the most rewarding annuals for any gardener because they offer an exceptionally long flowering period. Generally, in autumn .