When growing mint inside, there are a few things necessary for its continual care. One is watering. These plants prefer to be kept moist but not overly wet. If the upper part of soil becomes dry to the touch, then watering is needed. Otherwise, try to keep it evenly moist. Humidity is another important factor, so mist the plant between watering or set the container on a water-filled tray of pebbles. In addition, you should rotate the plant every three to four days or so to maintain a more even appearance, as plants tend to bend towards the light, becoming somewhat lopsided. If desired, you can move your mint outdoors for summer, too. While fertilizing isn’t a must with this plant, you can give it an occasional dose of all-purpose, water soluble fertilizer or fish emulsion. Mix the fertilizer at half strength. Don’t over fertilize, as this can cause the herb to lose its flavor.