Peperomia Watermelon, scientifically known as Peperomia argyreia, is a striking ornamental houseplant with distinctive, watermelon-patterned foliage. The leaves are broad, rounded, and green with silver stripes running across, resembling the skin of a watermelon. It typically grows to about 6–12 inches tall and spreads 8–12 inches wide, making it an excellent choice for small spaces.