Bonsai trees are made into dwarfs by careful root and stem pruning coupled with root restriction. This is where those little pots come into play. The goal is to emulate nature. A well-shaped bonsai will resemble a very old tree or grove of trees.
Watering: Regular watering is job number one, so place your plant where you’ll remember to water it. A bright kitchen window or sunny bath tends to have higher humidity, which your plant will appreciate. It will also benefit from an occasional misting.
Fertilize: Interior bonsai need very little fertilizer to thrive, Just four to eight drops of liquid 10-15-10 added to a gallon of distilled water does the trick. Saturate your bonsai with the solution once a week in addition to regular watering. Bright-light plants, such as Ficus, require more fertilizer than low-light ones. Never feed extremely dry plants, as the roots may burn. Water first, and then proceed with the fertilizer. Play it safe with new purchases as well; wait six weeks before fertilizing.
Pruning: Your best bet is to observe your tree for days, even weeks, before snipping the first leaf or branch. Visualize the shape you want and then prune. Normally, a store-bought bonsai has a developed form that merely needs refining.
Re-potting: Every two to three years, you may want to re-pot your bonsai. This can be done any time of year, but prior to the spring growth spurt is best. Cut roots back by half, and then replant using a well-drained potting soil. At the same time, reduce the canopy (foliage) by half. If you desire a larger plant, select a container one size bigger, and re-pot accordingly.