Plants are grown in rock or expanded clay. It takes about an hour for the water to saturate the rock-wool mat completely. Cover the seed-starting tray with a plastic dome.
Hydroponic gardening is a great way to grow plants indoors all year, and there's no weeding.
The box in which you'll grow the plants can easily be set up in a family room or kitchen. The mechanics of this style of gardening are simple, and hydroponic gardens may be purchased in kits. No soil is involved. The entire system holds just 8 gallons of water. Once you've got your kit, just add plants and water, and adjust the pH. All the nutrients your plants require come from the growing solution.