Answer
How do I design a long narrow garden?
Break it into zones, move the path off-straight, plant the sides, and give it a destination.
In short
A long narrow garden works best broken into zones across its length, with the path moved off a straight line, planting brought in at the sides, and a destination at the far end, so the eye stops rather than racing to the back fence. Design is what unlocks a tricky shape.
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