Every quality that sells an indica seed was bred there by a range of mountains. The squat frame, the seven-to-nine-week flowering, the hard frosted flowers, the wide blue-green leaf, the purple that appears as the nights turn cold: none of these is an design. They are the answers a population arrived at through thousands of years to a particular combination of pressures, at high altitude, in a short dry season, on the slopes of the Hindu Kush and the ranges beyond it. Breeders carried that solution down the mountain and refined it, yet the logic of the plant is still the logic of the terrain. The examples referred to in what follows are drawn from the range at https://kushindicaseeds.com and its stock goes back to Afghanistan, northern Pakistan and the Indian Himalaya; the argument itself holds to any true indica from any seed bank. Reading the terrain is the quickest way to understand the pack.
Where the Population Formed
The Hindu Kush runs for about eight hundred kilometres from the middle of Afghanistan towards northern Pakistan, with the broader indica homeland extending over into the Indian Himalaya to one side and the deserts around the Central Asian plateau on the other. Cannabis has been grown there for a very long time, chiefly for hashish, and chosen year by generation by people who wanted a plant above anything else: something that could be rubbed and sieved off a plant that would have ripened ahead of the first frost.
This is a different selection to the one that produced the tropical sativas, where daylength barely vary and the plant could grow for half a year. Everything that follows is a outcome of four facts about the place: it is high, it is arid, its summer is short, and the nights go cold early. The order that they are taken below hardly matter; a plant meets all of them in the same season.
The Fat Leaf
An indica fan leaf is wide, heavy and dark, and only a few wide lobes where a sativa leaf has many thin ones. Two things in the terrain favour the broad form. Thin air and hard sun put an high light load per square centimetre, and a wide leaf gathers enough without a lot of area; a large thin leaf in that light simply burn. And constant wind tears thin leaves, whereas a stout, short-petioled leaf stays put.
The deep colour is chlorophyll packed densely into a heavy leaf, which is one part of the same answer. For the grower these leaves count in one practical respect: a dense indica canopy blocks light from all growth below the top layer much more thoroughly than a sativa’s, which means lower buds on an untrained indica finish in small and loose. Growers who strip a few fan leaves at week three are reversing, carefully, what the mountain did over many thousands of years.
Seven Weeks Before the Snow
At two thousand metres the growing season is short, while the autumn comes quickly and hard. A plant which took fourteen weeks to ripen from the days began to draw in never set seed in such ground, and its genes left the population. The plant that remained responds sharply to shortening days and ripens in about seven to nine weeks after that cue.
In a tent that reflex is the one most valued indica quality. Flip to twelve hours and the plant commits immediately, stretches over a fortnight and stacks flower for the rest of a brief run. The quickest strains at Kush Indica Seeds come in at around 7 weeks from the switch, and that permits five or six cycles a year from one space where a long sativa allows perhaps two. That speed is no cleverness on the breeder’s part; it is the first snow encoded into the plant’s calendar.
Resin as Sunscreen and Sealant
The traditional zone is dry: thin humidity, hard sun, little rainfall in the late summer. A plant in such a place has two pressures which resin answers at once. It needs to shield its reproductive parts from UV exposure, and it must keep moisture in the bud over weeks of dry wind. A heavy coat of trichomes does both: their heads block UV and the waxy layer reduces water loss. Farmers for hashish on top of that drove the resin even harder, since resin was always the product.
Tight flower form goes to the same story: a closely clustered bud loses less water than an airy one in dry air. Inside a tent those two qualities come together, and only one of them is unconditionally an advantage. The resin is. The density becomes a risk the moment the air is damp: a bud built to hold water in a desert holds it equally as well in a damp tent, and botrytis spreads through a hard indica cola faster than in anything the equator ever made. The quality that moves the seed is the one that needs a drier room in the final few weeks.
Altitude: Why the Plant Is Short
Much of the old growing zone sits between a thousand five hundred and three metres. Up at that height the air is thin, the ultraviolet exposure is heavy, the wind is relentless and each centimetre of stem above the ground costs resources the plant cannot afford. A tall plant on such terrain dries out faster, breaks more and gets little for its extra height, because there is no canopy to clear.
The population which persisted is low: tight internodes, a strong thick central stem, side branches held close, frequently wider than it is tall. In a tent that carries over directly: a pure indica line gains perhaps half its height again through flower where a sativa doubles, fits beneath a lamp with a modest short gap and rarely needs tying down. Growers short on little height choose indica for precisely this trait, and it is the mountain, not the breeder, that they are relying on.
Cold Nights: Why Some Go Purple
High-valley nights fall below ten degrees long before the days do, and a good number of indica populations react to that chill by making anthocyanin, the same compound that turns autumn leaves red. In the plant it shows as purple in the calyxes, leaves and occasionally the stem, and it does little for the smoker except look beautiful.
The thing worth taking from the colour is a matter of lineage, not cosmetic. The tendency to turn is carried from particular cold-valley populations, and a line that colours reliably with a cool last fortnight carries the ancestry regardless of what the label says. Lines sold as “purple” that only colour with extreme cold, or not really, usually carry the colour in only the name and in the genes. Chilling the room during the last weeks brings the colour forward if it exists and does nothing if it is absent; it also checks the finish, so it is a trade and not a costless trick.
Afghani, Mazar, Chitral, Hindu Kush
Most indica seed labels are the names of names or descend from them, and the places are far more useful than they realise. “Afghani” usually means a population out of the Mazar-i-Sharif of Afghanistan, and the classic short, hash-plant, fast-finishing form. “Hindu Kush” in a name points to the high range itself and often to stock taken on the eastern side. “Chitral” and “Mazar” point to particular valleys with their own local types, the first often colouring and the latter heavy and late for an indica. Kush Indica Seeds gives the origin area for each line whenever it is known, which turns the name a brand to a fact the grower can use.
Most indica seed on sale is worked material several generations removed from the valley, selected for uniformity and not to preserve the variation of a pure landrace holds; a buyer who is after the population itself has to shop for packs labelled as unselected landrace stock and accept the surprises which arrive with them.
Where the Adaptations Turn Against You
Every trait described above was an solution to the pressure that a tent no longer impose, and any trait without its problem behaves one of two things: it becomes a free advantage or it becomes a hazard. The speed and the short frame become advantages, since no condition in a tent penalises them. The density and the broad canopy are hazards, since the arid air that justified them is gone and the damp air of a sealed room has precisely the reverse influence.
This is why the indica grow succeeds or fails on a single variable far more than any other: humidity in the final few weeks. A grower who keeps it low gets the hard, frosted, early harvest the mountain built; one who does not gets rot inside the best colas, which is the the plant had arranged the plant to hold water in. Indoors, the mountain is to be reconstructed in the last two weeks: cool, dry, moving air. Everything that remains about running indica is forgiving exactly because the plant was selected for a place much harder.
The Drift of a Word
The word that lent the mountains its name has since travelled a long way from it than any term in cannabis. “Kush” in a modern pack listing can refer to an unselected Hindu Kush landrace, a Californian Coast hybrid with one Kush ancestor, or a strain called Kush since the breeder thought the sound of it. A OG Kush line, and this accounts for most of the appearances of the word today, is most likely more sativa-influenced than many of the plants it takes the word from, and its growth habit, flowering time and leaf say as much.
A practical rule is the one that holds throughout this article: ignore the word and go back to the terrain. A listing that states an low stretch, a finishing time under nine weeks, a hard flower and a wide leaf is describing a mountain plant regardless of what it is called; one that states a tall frame, twelve weeks and airy buds is describing something else wearing a borrowed name. The seed carries where it was shaped by; the name often has forgotten.