Wichurae moss stay short. It likes moist, but not too wet. After 3 months it will be greener like short grass. But DO NOT let it dried out too many times. If dried out too many times it will be turn yellow red colors. But it will be new growth to cover it in few months.
At Moss Design Gallery we use grow lights for all of our moss products, ensure the lights are between 6,500k - 7,000k in color for 10 hours a day OR you can use a east facing window! Make sure you don't leave the grow lights on all the time, the moss needs to rest!