Petunia plant named ‘Jam Bluintwo’

A new petunia plant particularly distinguished by medium to large, light bluish-violet flowers with dark throats and distinct dark veins, medium to deep-green foliage with wide leaves, a medium, round, bushy, moderately tight plant habit with moderately vigorous growth, an initially upright and spreading to later prostrate or trailing plant habit with an early and continuous flowering response, is disclosed.