Weeds

The deepest insight in Mabey's book is that weeds are, above all, followers. Wherever people break ground — plough a field, build a road, raze a house, dig a trench — we create the raw, sunlit, nutrient-rich conditions that these plants are built to exploit. They are the vegetation of disturbance, and no creature disturbs the earth like the human one. In this sense the weed is not an intruder on human territory. It is a product of it. We manufacture their habitat with every act of construction and cultivation.

Mabey's most haunting example is the London Blitz. As bombs flattened whole streets, the ruins filled within a season or two with rosebay willowherb, its magenta spires rising over the rubble so thickly that Londoners nicknamed it bombweed. The plant had been relatively scarce a century before; the disturbance of war handed it a continent of bare ground. Oxford ragwort did something similar, escaping a botanic garden and spreading along railway lines, whose cinder beds mimicked the volcanic slopes of its native Sicily. The trains carried its seeds in their slipstream from town to town.

If weeds are so faithfully useful as survivors, why the depth of the loathing? Mabey argues that our reaction is rarely proportionate to any real harm, and that the language gives it away. We speak of weeds the way we speak of enemies — they invade, they choke, they smother, they take over. The vocabulary is military, and often moral. This, he suggests, is because weeds threaten something we care about more than the yield of a flowerbed: our sense of control, of a clean line between the cultivated and the wild.

He is sharp about how that anxiety spills into culture. Weeds and their botanical cousins have long served as figures for whatever a society fears is creeping in — foreignness, contamination, the loss of order. Mabey points to the triffids of John Wyndham's novel, walking predatory plants, and to the seed pods of Invasion of the Body Snatchers, where alien vegetation quietly replaces people while they sleep. The horror in these stories is vegetable: a green, patient, spreading thing that cannot be reasoned with and will not stop. It is the weed anxiety turned into nightmare.

Step back from the individual plants and Weeds becomes a book about a line — the one we draw between nature and the garden, the wild and the tended, what belongs and what intrudes. Mabey's real subject is that this line is entirely our own invention, and that weeds are the plants that live along it, refusing to stay on the side we've assigned them. They are wild things that have learned to thrive in our most managed spaces, which is exactly why they unsettle us. They prove that the boundary is not a wall but a fiction we maintain by constant weeding.

This reframes the whole quarrel. When we pull a weed we are not really defending nature against disorder. We are defending one arrangement of nature — our arrangement — against another that arrives on its own. Mabey notes that the plants we call weeds are often the ones doing the ecological work we claim to want: colonising ruined ground, holding thin soil together, feeding insects, healing scars in the land. A bombsite left to willowherb is not dying. It is recovering, in the only way bare earth knows how.

Mabey ends more or less where he began, on his knees in a patch of ground, except that the dandelion has changed its meaning. It is still in the wrong place. But wrongness now looks like the wrong word for a plant that is doing precisely what plants do when soil is opened to the sun. The war between the gardener and the weed has not ended; it simply can't be won, because every act of clearing prepares the next generation's welcome.