Grown indoors, the Red Luna prefers a spot with bright indirect sunlight. Water sparingly in spring and summer. Also, remember to fertilize once a month using a well-balanced liquid fertilizer. For it to grow its stunning foliage, the Red Luna Caperata prefers bright, indirect sunlight. An east- or west-facing window is the best spot. If placing it in a south-facing window, add a sheer curtain to filter light or place it in a dark room and install artificial grow lights. Red Luna is highly sensitive to watering. If you end up overwatering, the roots will start to rot, which will in turn lead to leaf loss and ultimately, kill the plant. So just how frequently should you water this plant? The secret is to ensure the soil completely dries out between waterings.