Artificial Bamboo
Bamboo is the natural choice when the problem is a narrow space. Its habit is tall and upright with very little spread, so it fits where a conventional tree cannot — along a hallway, in the gap between a sofa and a wall, in front of a slim window, or lined up as a run of pieces to screen one area from another.
That screening use is where artificial bamboo genuinely outperforms the real thing. Living bamboo is famously invasive, and containing it outdoors means barriers, root pruning and vigilance; indoors it wants far more light than most rooms provide. An artificial run gives you the same green vertical screen with none of that, and it stays exactly as dense as the day you installed it.
Bamboo reads as both zen and contemporary depending on what you put it in — a low, wide, simple container leans Japanese, while a tall dark planter leans modern and architectural. For outdoor screening choose from the UV-protected outdoor range, and see Japanese and acer trees for a similar mood.