- Make sure the species that you have is well suited to being kept indoors. One good species for indoor bonsai are Ficus.
- Keep your bonsai in the right spot in you home. Bonsai, like all plants, love light. A well lit window that doesn't receive large amounts of direct sunlight is best. Direct sunlight can cause the plant to get to warm and dry out. It should also be noted that you should never keep bonsai on top of or near electrical equipment, such as televisions or computers. Bonsai require water, and water and electricity don't mix well. It is also important to turn the tree every few days so that all sides of it receive equal light.
- Make sure that your bonsai's soil stays moist. Water only when needed though. Too much water can kill the tree just as fast a too little. (On a side note, when you water your bonsai, you might want to put a tray underneath it because the water will drain out of the pot, potentially ruining anything in the vicinity.)
- Mist your bonsai regularly. Bonsai like humidity, and their desire for that can be satisfied through misting it about twice a day. It also helps to keep the leaves clean and free of dust. When covered in dust, it is hard for a tree to transpire properly, which can also harm the tree.
- Don't close the curtains with the bonsai still in the window, especially if it is starting to get colder outside, or you live in a climate where it becomes very cold at night. The curtains may help to keep the cold out of your house, but traps it around your bonsai. The best solution is to simply take your bonsai out of the window at night.
- Just like outdoor trees, indoor bonsai need fertilizer. During the growing season, be sure to fertilize the tree.
- Indoor bonsai need to be repotted. Younger trees need to be repotted every year, typically in the spring because they grow more vigorously than their more mature counterparts, which should be repotted every two to three years.
Growing bonsai indoors requires a little more care in some aspects, but has many benefits. All plants, including bonsai, improve the air quality in a home because they emit oxygen into the environment. Growing bonsai indoors also ensures that you can care for them no matter what the weather conditions are outside.
Any other techniques for keeping an indoor bonsai in tip-top shape? Share your ideas in the comments!