Peperomia Watermelon in Alani Terracota. Watermelon peperomia (Peperomia argyreia) is appreciated for its rounded, fleshy leaves marked with silver and dark green stripes that resemble the markings of a watermelon. Watermelon peperomia is a low-growing plant that reaches only 6 to 8 inches tall at maturity. Prce include Alani Terracotta pot, exclude wood stand. Watermelon peperomia thrives in bright, indirect sunlight. Water thoroughly when the top 2 – 3 cm of soil is dry to the touch. Allow the soil to dry out a bit between watering. Always keep an eye on your plant–if the leaves droop or feel a bit thin, it may also be time to water.