Answer: I think you're growing a Dracaena. There are many varieties, some with stripes and some with solid green foliage. With age the main stem becomes woody - almost like a trunk - and foliage emerges from near the top of the trunk and is strap-like. Your library should have houseplant books and I'll bet you can find a picture of a Dracaena similar to yours in one of the books. If it is a Dracaena, the leaf margins will turn brown if the plant is kept in too cool (such as in a draft), or if salts have accumulated in the soil. You can leach excess salts by flooding the soil with fresh water, allowing it to freely drain, waiting 30 minutes and flooding it again, then waiting 30 minutes and flooding it a third time. If you leach the soil every 3-6 months, excess salts shouldn't build up in the soil. Best wishes with your plant!
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