Perennial Herb or Subshrub: Can grow outdoors or as a houseplant. The dark green leaves have a silver stripe running down the middle that looks like they are reflecting moonbeams and gives a metallic effect. Air purifying plant. Occasionally blooms but pink or cream flowers are tiny and go unnoticed. Bushy habit. Height: 6-12 inches. Width: 6-8 inches. Exposure: 4 hours of indirect, bright light as a houseplant. Water: 2-3 times per week. USDA Z10-11.