The more your indoor garden mimics good habitat for worms, the happier they will be. An indoor garden consisting of deep containers containing food and bedding sources, as well as moisture and darkness, provides the necessary environment. This project works best for those who already maintain an indoor worm bin and can transfer some red wigglers, or Eisenia fetida, into the indoor garden.
Construct or purchase a planter about 10 to 12 inches deep with drainage holes and a tray to catch excess water. Look for a planter that ideally mimics the dimensions of a worm bin, which may be 2 feet wide by 3 feet long, to provide the greatest possible soil volume.
Layer the bottom of the planter with 2 inches of soaked cardboard torn into strips about 1 inch wide.
Layer the soaked cardboard with food sources for the worms, such as coffee grounds, tea bags and smashed eggshells, which will provide nutrients without the risk of anaerobic odors.
Fill the rest of the planter with peat moss and humus. Add topsoil only if has not been treated with any chemicals or fertilizers. Avoid potting soil, which may contain fertilizer and vermiculite.
Add plants to the garden.
Add the worms to the planter, placing them gently between the plants where the soil is loose so they can move quickly to hide below the soil surface.
Place the planter where it will receive adequate lighting for the plants, but also where the habitat will be dark at night, which worms prefer.
Try to keep the soil at 70 to 80 percent moisture as measured by a moisture meter, which can be found at most home centers.
Add additional nutrients for the worms via top feedings, scratching the coffee grounds and eggshells into the top level of the soil. Add a good quantity of food when repotting plants, repeating the process of adding soaked cardboard and food sources to the bottom of the planter.