Edward Thomas gives himself very little to work with: a strip of scrubby trees, a woodman, a stream too small to have a name. Yet in sixteen lines he captures something that feels like a discovery made in real time. The speaker has walked past a copse "day by day" without seeing it, and only when it is cut down does he understand what it was. The title promises a lesson about loss, but the surprise comes in the last line. What the loss reveals is not just that the copse mattered, but what it did. It was where the brook began.
The poem begins with a failure of attention. The first line ends on the stranded word "until", and the sentence has to wait for the next line to deliver "'Twas gone". The realisation arrives late, and the line break makes us feel the lateness. Thomas doesn't sentimentalise what was lost: it was "not more than a hedge overgrown", something ordinary enough to ignore. He measures its distance in a farmer's unit, "one meadow's breadth away", and the rhythm of "I passed it day by day" has the plod of habit in it. Notice how many of the poem's key words concern sight: "noticed", "hidden", "see", "look". This is a poem about attention, and about how routine dulls it.
The imagery of the aftermath is stark. The soil is "bare as a bone", a simile that makes the field look stripped and skeletal. It is "black betwixt two meadows green", a dark gap between two bright colours, and the slightly archaic "betwixt" makes the phrase sit heavily in the line. Then comes a small consolation. The "fresh-cut faggot ends / Of hazel" gleam "as if flowers they had been". The grammar is delicate here. The cut wood does not look like flowers; it looks as if it had once been flowers, a double remove from comfort. The word "amends" suggests a debt being paid, but only "some" of it, and the poet knows it is a trick of the light.
The form quietly supports all this. Every stanza uses an enclosed rhyme scheme, ABBA, so the middle pair of lines is wrapped in the outer pair, much as the copse sat "betwixt two meadows". The lines also alternate in length, with four beats, then three, three, and four again, which gives each stanza a steady, walking pace. The ending loosens the pattern. "Near" and "there" are only a near-rhyme, and the last line stretches to hold "A tributary's tributary, rises there". The repeated word is almost a tongue-twister, and it points to the smallest, most overlooked kind of water there could be. The word "now" appears three times ("Where now", "Now the soil", "And now I see"). Each time it pins us to the present, and the third marks the turn from looking at damage to understanding it. The only exclamation mark, in "Strange it could have hidden so near!", is followed by a calm, almost flat final statement, as if the speaker were catching his breath and then simply reporting the facts.
What makes the poem significant is its restraint. It never says "we only value things once they're gone"; it lets a muddy field and a trickle of water make the point. The copse was hidden in plain sight, and its importance was structural, the source of something else, not merely pretty or sentimental. Thomas was killed in the First World War in 1917, and it is tempting to hear larger losses behind these lines. Nothing in the poem demands that reading, though, and its power comes from the way it stays in the meadow. That leaves readers to carry the idea, as the speaker has to, to everything else they have walked past without looking.