Each quality that sells an indica seed has been put there by a range of mountains. The short frame, the fast flowering, the dense resinous buds, the broad dark leaf, the purple that comes in when the nights go cold: none of these is a breeder’s design. They are the solutions a population arrived at over thousands of years to a particular combination of pressures, in great altitude, in a short dry, cold season, on the slopes of the Hindu Kush and the ranges beyond it. Modern breeding carried that answer off the mountain and polished it, yet the logic of the plant is still the logic of the terrain. The examples referred to below are drawn from the range at https://kushindicaseeds.com and its stock traces to Afghanistan, northern Pakistan and the Indian Himalaya; the argument though holds for any true indica out of any seed catalogue. Knowing the terrain turns out to be the most reliable way to read the pack.
Where the Population Formed
The Hindu Kush stretches for about eight hundred kilometres from the middle of Afghanistan into northern Pakistan, and the broader indica zone spilling across into the Indian Himalaya on one side and the deserts around the Central Asian interior on the other. The plant has been grown there for a very long time, chiefly for hashish, and selected year after generation by farmers who needed resin rather than any other quality else: something that could be rubbed or pressed off a plant that had ripened ahead of the first snow.
That is a separate history from the one that produced the equatorial sativas, in which seasons hardly change and the plant was free to flower for most of a year. All that comes below is a outcome of a handful of conditions about the place: it is high, it is dry, the summer is short, and the nights go cold fast. The sequence that they are taken below does not matter; a plant experiences every one of them in the same season.
Finishing Before the Frost
At two thousand metres the frost-free window is short, while the autumn comes early and comes hard. A plant that needed fourteen weeks to finish from the days began to shorten did not set seed on that ground, so the genes dropped out of the population. What remained responds sharply to shortening days and finishes in roughly seven to nine weeks from that cue.
In a tent that reflex is the single most cited indica quality. Flip to twelve hours and the plant moves immediately, stretches for a couple of weeks and fills flower over the remainder of a brief run. The fastest lines at Kush Indica Seeds finish in about 7 weeks after the flip, which permits five or six cycles a year from one space where a classic sativa gives perhaps two. That difference is no efficiency on the breeder’s side; it is the first snow encoded into the plant’s own calendar.
Built for a Desert Autumn
The old homeland is arid: low humidity, intense sun, little rainfall through the late summer. A plant in such a place has two problems which its resin answers at once. It needs to shield its reproductive tissue from ultraviolet light, and it needs to hold moisture in the flower over a long stretch of desiccating wind. A heavy coat of trichomes do both: their resin heads absorb UV and the waxy layer slows water loss. Farmers for hashish on top of that pushed the trait further, since resin was the crop.
Dense bud form goes with the same story: a tightly packed bud loses less water than an open one in dry air. Inside a tent these same traits come together, and only one of them is unconditionally an advantage. The resin is. The density becomes a risk the instant the air is damp: a bud built to retain water in a desert retains it equally well in a damp room, and bud rot spreads in a dense indica cola faster than through anything the equator ever produced. The quality that sells the seed is the one that calls for a drier room during the final three weeks.
The Fat Leaf
The indica fan leaf is wide, thick and a deep green, and few wide fingers whereas a sativa fan leaf carries many thin ones. Two pressures about the terrain favour the broad form. Thin air and hard sun put a high light load per square centimetre, so a broad leaf gathers plenty and does not need needing a lot of area; a large narrow-fingered leaf would just burn. And constant wind tears thin leaves, whereas a stout, short-stalked leaf stays put.
The deep colour is pigment packed thickly into a thick leaf, and one part of the same adaptation. For the grower the leaves count in one everyday way: a broad-leafed indica canopy blocks light from everything below the top tier much more completely than a sativa’s, so the lower buds of an untrained indica come in airy and loose. Growers who strip a fan leaves in mid-flower are reversing, a little, what the range put there for thousands of years.
The Colour of a Cold Valley
Mountain nights fall under ten degrees long before the days do, and many indica populations react to that chill by producing anthocyanin, the same pigment that turns a maple leaves red. On the plant it shows as purple through the calyxes, fan leaves and occasionally the stem, which it offers nothing for the smoker except looking striking.
The point to take from the colour is genetic, not cosmetic. The capacity to turn is carried out of specific high-altitude populations, and a strain that colours reliably with a cold final two weeks has that origin whatever the name says. Lines sold as “purple” that will only colour with extreme cold, or not at all, typically carry the word in only the name and in the genes. Chilling the room in the last weeks brings the colour out if it exists and does nothing where it does not; it at the same time slows the finish, so it is a bargain and not a free trick.
Altitude: Why the Plant Is Short
A good deal of the old growing land lies from a thousand five hundred and three thousand thousand metres. Up at that height the air is thin, the ultraviolet exposure is intense, the wind is constant and each centimetre of stem over the soil takes water the plant cannot spare. A tall plant in such terrain loses more, snaps sooner and gets little for its height, because there is no canopy to outgrow.
The population that survived is compact: tight internodes, a strong dense central stem, side branches kept close, frequently wider than it is tall. In a tent that carries over straight: a pure indica line gains maybe half its height again through flower whereas a sativa doubles, sits beneath a light at a modest short distance and rarely requires tying at all. Growers with limited headroom buy indica for precisely this reason, and it is the mountain, not the breeder, that they are relying on.
The Valley Names on the Pack
The great majority of indica pack names carry the names of names or descend from one, and the places are far more useful than most buyers look. “Afghani” usually refers to stock from the Mazar-i-Sharif region, which is a typical short, resinous, fast-finishing type. “Hindu Kush” in a name refers to the central range proper and frequently to material collected on the Pakistani side. “Chitral” or “Mazar” point to particular valleys with their own local forms, the former frequently colouring and the latter heavy and late for an indica. Kush Indica Seeds lists the collection region on each line where it is known, which makes the name from from a brand to a datum the grower can plan around.
Most indica seed on sale is worked material several generations removed from the original collection, bred for consistency rather than for the variation of a pure landrace carries; a buyer that wants the population itself has to look for packs labelled as unselected reproductions and expect the surprises which arrive with them.
Where the Adaptations Turn Against You
Each adaptation discussed above was an solution to the condition that a tent does not impose, and any trait that has lost its problem does either of two things: it becomes a free advantage or it becomes a cost. The fast finish and the low frame become advantages, since no condition in a room penalises them. The density and the heavy leaf are hazards, because the arid air that made sense of them is absent and the still atmosphere of a closed room has precisely the opposite effect.
That is why the indica grow succeeds or goes wrong on one factor more than any other: humidity during the last three weeks. A grower that keeps it down gets the dense, frosted, early harvest the mountain built; one that lets it rise gets rot in the best colas, which is exactly where the mountain was arranged the plant to hold water in. Indoors, the terrain has to be reconstructed in the final fortnight: cool, dry, with moving air. Everything else about growing indica is easy exactly since the plant was selected to survive a place hard.
The Drift of a Word
The word that lent the range its name has moved a long way from it than any other in cannabis. “Kush” in a modern seed name can refer to a unselected Hindu Kush reproduction, a West Coast hybrid carrying one Afghan ancestor, or a line named Kush because the breeder liked the sound would sell. The famous OG Kush line, which dominates the use of the word in the market, is probably as much sativa-influenced than many of the stock it borrows the word from, and its stretch, flowering time and leaf shape say as much much.
A practical rule is the one that holds across this page: ignore the word and read the terrain. A listing that gives an modest stretch, a flowering time under nine weeks, a dense bud and a broad leaf is describing a mountain plant regardless of what it is called; one that states a lanky habit, eleven weeks and open flowers is describing a plant from else with a borrowed name. The seed remembers the place it came by; the name often has forgotten.