This rare and sought-after established Oxalis Triangularis plant has gorgeous distinctive purple leaves that will close at night and open again in the morning.Your Oxalis prefers a humid environment, use a humidifier or mist often if the air is dry. Your Oxalis prefers normal room temperatures between 65-75. They cannot tolerate hot temperatures above 75-80 degrees. Feed your Oxalis once a month during spring and summer with an all-purpose houseplant fertilizer.