1、 Leaf difference

Petunia leaves have short stalks or almost no stalks. The leaves are oval in shape, sharp at the top, wide wedge or wedge-shaped at the base of the leaves. The leaves are entire, 3 to 8 cm long and 1.5 to 4.5 cm wide

The leaves of morning glory are broadly ovate or nearly round, with deep or shallow 3-lobes, about 4 to 15 cm long and about 4.5 to 14 cm wide. The base of the leaves is round or heart-shaped, and the petiole is 2 to 15 cm long

2、 Flower difference

Petunia flowers are solitary in leaf axils. The pedicel is 3 to 5 cm long, the calyx has 5 deep cracks, the lobes are strip-shaped, about 1 to 1.5 cm long and about 3.5 mm wide. The top of the petals is blunt, and the colors of the flowers are white, purple or various Reds

Morning glory flowers are axillary, single or usually 2, attached to the top of the peduncle of the inflorescence. The peduncle is of different lengths, the Corolla is funnel-shaped, and the color is blue purple or purplish red