Vinca seed, often referred to as periwinkle seeds, belong to the Vinca genus, which encompasses a variety of colorful flowering plants. Vinca seed typically produce plants with glossy green foliage and vibrant, funnel-shaped flowers in shades of pink, purple, white, or red. These seeds are popular for their ability to thrive in various conditions, including both sunny and shady areas, making them versatile choices for gardeners.