Depending on the type and age of the plant, wires may be left in place for six months, a year, or even more. However, watch carefully for signs that the plant is being choked or disfigured due to heavy growth.
There are also some easy ways to train parts of plants without wiring them. Branches can be pulled down to a horizontal line by looping soft cord around them and hitching it to the container. They can be made to hang down, or weep, by hanging weights at the tips. If you want to straighten a trunk, tie it with something strong, like raffia, to a straight bamboo stake. To narrow a wide fork between two branches, pull them together with raffia. To widen a fork, prop it apart with a light wooden wedge.
Location
Whether you have a collection of bonsai growing on tables or benches, or perhaps just a few plants, in summer give them outdoor growing quarters where there is a free circulation of air. Full sunlight is good except during the hottest weeks or months. Be careful to protect them against hot, drying winds and burning sun, which they cannot stand. Being in small containers, excessive heat or dryness is dangerous. We had some old bamboo shades that once enclosed our porch which were good protection. We also had some lath screens which came in handy. Lacking either, hang up old sheets or sections of burlap. You can help by keeping it moist with the garden hose.
Watering
Many factors determine how often your plants should be watered—age, type, size, how recently they were repotted, size of root system, and the usual climatic conditions such as temperature and humidity. About the only concrete thing I can say is that your plants will resent neglect, and will show it. Newly potted plants should be kept moist constantly until they begin to make new growth or show other signs that they have recovered from pruning and transplanting. For plants that are established, the ideal is limited moisture in the soil. Don’t keep it so wet that rank growth is encouraged. And please beware of rot. That is one of the most evil of evils when you are too generous with the watering can. At the other extreme, the soil shouldn’t be so dry that the plant wilts beyond recovery. You, as a grower, will have to determine this for yourself. I do it by feeling the soil in the container. If it feels moist to the fingers, no water is needed. Let it feel dry and it probably needs a drink. When you do water, be thorough. Make sure the soil is so completely moistened that the excess water runs out the drainage hole in the bottom of the container.
Fertilizing
There is a definite, delicate balance between too much and too little fertilizer for a bonsai plant. Too much food and it grows too large and is loaded with large foliage, flowers, and fruit. If you feed it too sparingly, it will suffer from malnutrition. I most certainly wish I could give you an exact rule to use. I fear no one can. Requirements differ for different plants. All I can offer is a few basic principles. The rest is up to you.
For the first few months after you have repotted a plant in fresh soil, withhold all fertilizer. Don’t fertilize a plant that is weak or sick or approaching dormancy, and don’t fertilize when the soil in the pot is dry. Be alert to fading leaf color, reluctant growth, and all similar signs that a plant is suffering for want of nutrients. These signs may be most apparent during the spring season of most active growth.
Organic fertilizers such as bone meal, liquid manure, or fish emulsion are usually recommended, and should be used sparingly in weak solutions. The purpose of this feeding is to keep the plant healthy but still small, and not to encourage larger growth.