Epiphytic Perennial: Large, shiny green heart-shaped leaves develop holes (fenestrations) as the plant ages, making the leaves look like Swiss cheese. Height: climbing up to 70 feet. USDA Z10-12. Creates a tropical look indoors. As a houseplant: Put in indirect, bright light. Provide support when it climbs. Height: around 6-8 feet. Water: once or twice a week. Avoid soggy soil, water when top 2-3 inches are dry. Toxic to humans and pets if ingested.