Bonsai trees often are grown and cared for in homes as decorative pieces that compliment the design of a living space. When planting a bonsai seed to be grown indoors, more care is needed than for other house plants. For example, during growth, the tree must be shaped so that it forms a spiral shape. Remove all branches and twigs to dwarf the bonsai tree to the shape of your liking. Before you can correctly prune a bonsai tree, make sure you plant the bonsai seed so that it will begin with healthy growth.
Purchase the seeds from your local garden store or online. It's important to choose a type of bonsai that you will be able to shape to your liking.
Dig a hole that is 1-inch deep by 1-inch wide in a medium-size garden pot filled with potting soil. Pack the soil tightly and place the pot near an area that receives plenty of sunlight.
Water the bonsai seed immediately with ½ cup of water. Continue watering the seed one to two times a day for four weeks or until the seedling begins to sprout. Once the bonsai seedling appears, reduce your water to three to four times a week or whenever the soil is severely dry.
Apply a thin layer of 10-10-10 fertilizer to the seed bed as instructed on the fertilizer package and once the seedling growth begins. Use fertilizer that contains nitrogen, potash and phosphoric acid to provide healthy growth. Apply fertilizer again at the beginning of every season.
Use scissors or small gardening shears to prune the bonsai seedling as it grows. Clip off the small branches that grow and use bonsai wire to help shape the tree as desired.