Sandburg built his career on Chicago Poems (1916), celebrating industrial muscle, steel, railroads—the modern city's permanence. By 1918, that confidence was harder to hold. This poem inverts his usual materials. Instead of "Hog Butcher for the World," we get fragile petals.
The windflower (genus Anemone, from Greek "wind") blooms early spring in prairies and woodlands. Sandburg grew up in Galesburg, Illinois, would have seen them as a child. They're the first flowers after winter—"so fresh"—and they vanish quickly. The poem treats them as geological, not seasonal. "Out of old winds, out of / old times" stretches the flower's annual return into deep time.
"The wind young and strong" is the key phrase. Wind is both the destroyer (weathering stone) and the keeper (spreading seeds, pollinating). It's young because it renews itself, unlike monuments that age from the moment they're built. The flower survives by partnering with what destroys everything else.