Answer: It's always a little nerve-wracking taking care of someone else's houseplants--especially when they have such a perfect specimin. Here are a few reasons that Norfolk Island pines (Araucaria heterophylla) lose their lower branches: humidity is too low, temperature is too high, light is too dim. The plant prefers a spot where it will received filtered light with some direct sun in early morning or late afternoon. The plant adapts well to summers outdoors, again in a spot with filtered shade. (If you do decide to put the plant outdoors in the summer, just be sure to slowly acclimate it to its summer home by placing it outdoor for just a few hours a day for the first week, and increase the time outdoors over a two or three week period, just to be sure it's "settled", and remember that it may need more frequent watering.) Interestingly, the plant becomes a 100-foot tall tree in its native Australia! Hope this helps.
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