How to grow moss in-house is a easy task; in fact, this can be a good project for parents and friends to do together. Start with a clear glass container that has a lid, such as a terrarium or a large jar. Place about an inch of pebbles in the bottom of the container, then top that with about an inch of granulated charcoal, which you can find in fish supply stores. Add two inches of potting soil and mist the soil with a spray bottle filled with clear water.

Create the base of your indoor moss garden by placing different sized stones and branched sticks to make the ground look like the forest floor. Place larger objects in the back and smaller ones up front. Place sheets of moss over the larger objects and fill in the rest of the area with crumbled bits of moss flakes. Mist the moss, cover the container and place it in a room away from bright sunlight.

Press the moss firmly onto the rocks and soil when planting. If the potting soil is fluffy, push it down to firm it into one mass. Keep the sheets of moss stuck to the rocks with fishing line, if need be. The moss will grow over the line and hide it.