If I'm not mistaken, it depends on the length if time light is applied to the plant (or tree, in this case).
If you had sufficient lighting and a decent temperature, I don't see why it wouldn't perpetually continue to grow under 24/7 light. The second you start changing things up... say, 12 hrs light, 12 hrs dark, THEN the plant will change it's behavior because it thinks it's a different season.
From what I know of plantlife, you could, hypothetically, take a tree from a cold climate, put it in a greenhouse, apply 24/7 light and a proper temperature, and it will just grow as if it was summer forever.
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I love lamp.
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