Having a lush, indoor garden does not require a huge investment. In fact, you can germinate an entire house full of trees using the seeds from a store-bought apple. Germinating fruit seeds is a simple and rewarding process, and while the trees will not produce fruit for at least a decade, the foliage and flowers produced are well worth the effort.
Fill a mug with warm water and soak the seeds in the water for 24 hours. This process will soften the seed coats, making them water-permeable.
Remove the seeds from the water soak. Fill the mug halfway with wet peat moss and place the seeds inside. Cover the seeds with another layer of wet peat moss and add some dry peat moss on top.
Cover the mug with a coffee filter held in place with a rubber band. Place the mug into the refrigerator for at least 10 weeks so that the fruit seeds can stratify.
Fill a small terra cotta pot with a mixture of half coarse sand and half potting soil. Plant the fruit seeds in the potting mix at a depth of 1/2 inch. Avoid overcrowding the seeds by planting no more than four in each pot and placing each one at least 1/4 inch away from the pot's walls and any other seed.
Set the terra cotta pot on a saucer filled with water and allow it remain on the saucer until the top of the soil is moist. Place the pot in a warm place and repeat this watering procedure daily until the seeds begin to sprout.
Place the pot on a sunny windowsill when the seedlings have grown several leaves. Water it whenever the soil dries out to a depth of 1 inch.
Transplant the saplings into larger pots when they grow to 4 inches tall. Continue faithfully watering the plants and watch them grow.