Each trait that sells an indica seed was put there by a mountain. The short stature, the fast flowering, the hard resinous flowers, the wide blue-green leaf, the colour that appears as the nights go cold: not one of these is an invention. They are the solutions a population arrived at through many thousands of years to a particular combination of problems, in great altitude, in a short dry season, on the slopes of the Hindu Kush and the mountains beyond it. Modern breeding carried that answer down the mountain and polished it, yet the logic of the plant is still the logic of the place. The lines pointed to in what follows are drawn from the range at https://kushindicaseeds.com whose stock traces to Afghanistan, northern Pakistan and the Indian Himalaya; the argument itself holds for any true indica out of any seed catalogue. Knowing the terrain turns out to be the most reliable way to understand the pack.
Where the Population Formed
The Hindu Kush runs for about eight hundred kilometres from central Afghanistan towards northern Pakistan, and the wider indica zone spilling across into the Indian Himalaya on one side and the lowlands of the Central Asian plateau to the other. Cannabis has been cultivated there over a very long time, chiefly for hashish, which means chosen year after year by people who wanted a plant rather than anything else: resin that could be sieved or sieved from a plant that had ripened before the first snow.
This is a separate history to the one that shaped the tropical sativas, in which daylength barely vary and the plant could grow for most of a year. All that comes below is a outcome of four conditions about the terrain: it is high, it is dry, the growing season is short, and its nights turn cold fast. The sequence that they are discussed here hardly matter; a plant meets every one of them at season.
The Fat Leaf
The indica leaf is broad, thick and a deep green, and few wide lobes whereas a sativa leaf has many narrow ones. Both things in the terrain favour that shape. High-altitude air and intense sun put a heavy light load per square centimetre, so a wide leaf gathers plenty and does not need much surface; a big narrow-fingered leaf would just scorch. And steady wind tears thin foliage, whereas a stout, short-petioled leaf stays put.
The deep colour is chlorophyll loaded densely into a heavy leaf, and part of the same adaptation. For the grower the features matter in one practical way: a broad-leafed indica canopy blocks light from everything beneath the top layer far more thoroughly than a sativa’s, so lower flowers on an unmanaged indica come in airy and weak. Growers that remove a few fan leaves at week three are undoing, a little, something the range did for many thousands of years.
Resin as Sunscreen and Sealant
The old zone is arid: low humidity, intense sun, little rain through the flowering season. A plant there has two problems which resin solves together. It must protect its flowering tissue from UV light, and it needs to keep moisture inside the flower over a long stretch of dry wind. Trichomes do both: the resin heads absorb the ultraviolet and the waxy layer reduces water loss. Farmers for hashish then pushed the trait further, because resin was always the crop.
Tight flower form goes with the same cause: a tightly packed bud loses less water than an airy one in dry air. Inside a tent those two qualities arrive as a pair, but only one of them is unconditionally welcome. The resin is. The density turns into a risk the instant the room is damp: a bud shaped to retain water in a desert retains it equally well in a wet room, and bud rot spreads through a hard indica cola faster than through any flower an equator has ever made. The quality that moves the seed is the one that calls for a drier room during the last few weeks.
The Colour of a Cold Valley
Mountain nights fall below ten degrees long before the afternoons follow, and many indica populations respond to the chill by producing anthocyanin, the same compound that turns autumn leaf purple. In the plant it shows as purple through the bracts, leaves and occasionally the stem, which it offers nothing for the smoker except looking striking.
The point to taking from the colour is genetic, not decorative. The tendency to colour is inherited out of particular high-altitude populations, and a line that purples reliably with a cool final two weeks has that origin whatever the label claims. Lines marketed as “purple” that will only turn under heavy cold, or not really, usually have the word in only the name and nothing of it not in the plant. Chilling the room during the last weeks draws the colour out where it exists and does nothing if it is absent; it at the same time checks the finish, so it is a trade rather than a costless effect.
Altitude: Why the Plant Is Short
A good deal of the traditional growing zone sits from a thousand five hundred and three thousand thousand metres. At that height the air is thin, the UV load is heavy, the wind is constant and each centimetre of stem above the soil costs resources the plant can ill afford. A tall plant on that ground loses more, breaks sooner and gains little for its height, because there is no canopy to outgrow.
The plant which persisted is compact: short internodes, a single thick central stem, side branches held close, frequently broader than it is tall. In a tent that carries over directly: a true indica seed gains perhaps half its height again through flower whereas a sativa doubles, sits beneath a light with a modest distance and rarely requires training at all. Growers with limited height buy indica for precisely this trait, and it is the mountain, not the breeder, that those growers are relying on.
The Short Season: Why It Flowers Fast
At two thousand metres the frost-free window is brief, and the autumn comes early and decisively. A plant that took fourteen weeks to finish from the days started to shorten did not make seed on such terrain, so its genes dropped out of the population. The plant that stayed reacts sharply to shortening days and finishes in about seven to nine weeks after the cue.
Indoors that reflex is the single most frequently valued indica trait. Switch to twelve hours and the plant moves at once, stretches for a couple of weeks and fills flower for the remainder of a short cycle. The quickest lines at Kush Indica Seeds finish in about 7 weeks after the flip, and that permits as many as five or six cycles a year from one space where a long sativa allows two. That difference is no efficiency on the breeder’s part; it is the snowline encoded into the plant’s own clock.
Afghani, Mazar, Chitral, Hindu Kush
Most indica seed labels carry place places or derive from them, and the places are far more useful than most buyers realise. “Afghani” usually refers to a population from the Mazar-i-Sharif of Afghanistan, and a typical squat, resinous, fast-finishing form. “Hindu Kush” on a name refers to the central mountains proper and frequently to material collected on the eastern side. “Chitral” and “Mazar” point to specific valleys with their own local types, the former often colouring and the second heavy and late for an indica. Kush Indica Seeds lists the origin region on each line whenever it is known, and that turns the name a flavour into a datum the grower can plan around.
Most indica seed on sale are worked stock many generations removed from the valley, selected for uniformity rather than to preserve the spread of a true landrace carries; a buyer who is after the spread has to look for lines labelled as pure landrace stock and accept the variation which arrive with the label.
What Changes in a Tent
Every trait described above was a solution to the condition that a tent does not present, and a trait that has lost its problem does either of two ways: it turns into a cost-free bonus or it turns into a hazard. The speed and the short stature are advantages, since nothing in a room penalises them. The density and the broad leaf become hazards, since the arid air that justified them is gone and the still air of a sealed room does precisely the opposite effect.
That is why the indica cycle succeeds or fails in a single variable far more than any other: humidity during the last few weeks. A grower who keeps it low is rewarded with the hard, frosted, early harvest the mountain bred; one that does not is punished with mould in the best colas, which is exactly where the plant was arranged the plant to keep moisture in. Indoors, the terrain is to be rebuilt in the final two weeks: cool, dry, with moving air. Everything else about running indica is easy exactly since the population was selected to survive a place much harder.
What “Kush” Means Now
The word that gave the mountains its name has since moved a long way from it than any term in cannabis. “Kush” on a modern pack listing can mean a unselected Hindu Kush reproduction, a West Coast hybrid with one Kush grandparent, or a strain called Kush because the breeder liked the sound would sell. A OG Kush family, which accounts for most of the use of the word in the market, is probably as much sativa-leaning than a good deal of the plants it borrows the word from, while its stretch, finishing time and leaf show as.
A practical rule is the one that holds across this article: ignore the word and go back to the terrain. A listing which gives an modest stretch, a finishing time below nine weeks, a dense bud and a wide leaf is describing a mountain plant whatever it is called; one that states a tall frame, eleven weeks and airy buds is describing something somewhere else wearing a mountain name. The seed remembers where it was shaped from; the label often has forgotten.