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Reading is an excellent way to increase your knowledge, and for those of you who are new to indoor bonsai fortunately there are a number of good books available, including: The TBS has produced several excellent articles on indoor bonsai - one being written by Jennifer de Four in the May 2000 Journal. The International Bonsai Magazine Issue 2000/No.4 goes into great detail on caring for Ficus. My favourite article is in the International Bonsai Magazine 1996/No.4, and the heading is "Growing Fluorescent Light Bonsai" by Jack Wikle.
Just like Jack Wikle, Perhaps my trees would be better if I did all of the above; I don't know, but I have kept indoor bonsai for about 20 years with reasonable success. Here is what I do . . . The first question is light - Yes, you can grow bonsai indoors in a south or west window, but I prefer to grow them under fluorescent lights. I use both a two bulb, and for my larger trees a four bulb fluorescent light stand. If you find light stands are too expensive, then purchase two 3-gallon size plastic nursery containers and one of the cheap 4-foot industrial fixtures at a hardware store. Turn the pails upside down, and suspend your fixture between them and Voila . . . you have a light stand! For bulbs, I recommend 40-watt warm white or deluxe warm white. Do not use the 34-watt bulbs as they do not give sufficient light output. For watering, I use a watering can with as fine a "rose" as you can find. How much to water varies with different species of plants. Here are some observations:
Ficus do not like wet feet, so let them get quite dry between waterings. Feeding - I use typical 20-20-20 normal strength most times every two weeks during summer. In the winter, I use 20-20-20 at 1/2 strength about once very 4-6 weeks, and also use some organic fertilizer such as fish emulsion. Soil - Both Dick Morton and Arthur Skolnik have soils available for tropical plants. I take my trees outdoors once night time temperatures reach over 7-8 deg. C., usually early to mid-May, and I bring them in under fluorescent lights before the first frost, usually late September. This is a very critical time because your trees are being subjected to much lower light levels and much drier air, so be very careful of your watering habits. All of my re-potting and root pruning is done when I first bring my trees out in the spring.
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