Sunkern is a mostly yellow seed-like Pokémon with a small sprout growing out of its top. Sunkern has triangular spike-like protrusions on top of its head, encircling the sprout. Sunkern's body has three broad brown vertical stripes. Two of the stripes start jaggedly above Sunkern's dark eyes, continuing downward. The other stripe is directly below Sunkern's mouth. Since Sunkern's eyelids are brown, the brown streak patterning appears uninterrupted when Sunkerns' eyes are closed.