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Through a small number of routes, and knowing which one a given disease uses tells you exactly which intervention will work — most garden disease advice fails because it addresses the wrong route.
Some designs do and many do not — the elaborate multi-compartment structures sold in garden centres are largely decorative, while a few simple features genuinely support insects. What works, and why:
Technically at any time; legally and ethically, not during bird nesting season — and in many countries it is a criminal offence to damage an active nest, regardless of intent. The legal position.
Much wider and much shallower than the popular image of a mirror-image underground canopy — the great majority of a tree's roots sit in the top 60 centimetres of soil and extend well beyond the
With an arsenal that is chemical, physical and — genuinely — communicative, because a plant cannot run away and must therefore solve the problem where it stands. Physical defences: thorns, spines and
From one year to several decades, depending overwhelmingly on the species and then on storage conditions — and the difference between species is far larger than most seed packets suggest. The
Dormancy is an active, regulated shutdown rather than a passive response to cold — plants prepare for it in advance, and understanding that explains a great deal of seasonal gardening advice. How a
Because growth is controlled by a hormone that redistributes to the shaded side, making that side elongate faster — so the plant bends without any part of it pulling or pushing. The mechanism. The
They do not — bacteria do it, inside nodules on the plant's roots, in one of the most consequential symbioses in agriculture. The plant supplies energy and a protected environment; the bacteria
Because the plants we call weeds are specialists in disturbed ground, and a garden is disturbed ground maintained deliberately — we create exactly the conditions they evolved for, then wonder why
Because it was grown in conditions you cannot reproduce, and what you bought was a plant at an artificial peak rather than a plant in a stable state. What commercial growing does to a plant: Ideal
Joining part of one plant onto another so they grow as a single individual — the scion supplying the top growth and the rootstock supplying the roots. It works because plants can heal a wound between
It detects gravity using falling starch grains inside specialised cells — a mechanism that works regardless of light, soil depth or which way up the seed happened to land, which is why planting
Mostly because of day length, which is the only environmental signal reliable enough to time a life cycle by — temperature varies wildly from year to year, but the length of the night on a given date
The damage is done by ice forming in the wrong place, and the difference between a plant that survives a hard frost and one that turns to mush is mostly about where the ice forms rather than how cold
Pollen has to physically reach the stigma of a compatible flower, germinate, and grow a tube down to the ovule — and almost everything about how a flower looks and smells is an adaptation to getting
Rather more than aerate it. Worms are physical engineers, chemical processors and distributors of organic matter, and the effects compound over years. The three groups, which do different jobs. This
Because microorganisms are respiring — breaking down organic matter and releasing energy as heat, exactly as your own metabolism does, but concentrated in a mass large enough that the heat cannot
Water is not pumped — it is pulled up the plant by evaporation from the leaves, and wilting is what happens when that pull outruns the supply. The mechanism, working from the top down: Transpiration.
It redirects growth rather than simply removing material — and understanding the mechanism is what turns pruning from guesswork into something predictable. The central principle: apical dominance.
Box blight is a fungal disease causing leaf drop and dieback in box, and it arrived alongside a second problem — box tree moth, whose caterpillars strip foliage entirely. Between them they have made
By designing around structure first and flowers last — because a garden that depends on flowers is compelling for a few weeks and empty for the rest of the year, which is the most common failing in
Clean them, keep them dry, keep the cutting edge sharp, and oil the metal — and the reason it matters beyond longevity is that blunt secateurs crush stems rather than cutting them, leaving a ragged
A great deal — provided you first establish what kind of shade you have, because the word covers conditions that are completely different from a plant's point of view. The distinctions that matter: