Each quality that moves an indica seed was bred there by a range of mountains. The short frame, the seven-to-nine-week flowering, the hard resinous buds, the wide dark leaf, the colour that comes in as the nights go cold: none of them is a breeder’s invention. They are the solutions a plant arrived at over many thousands of years to a particular set of problems, at high altitude, in a brief dry summer, across the slopes of the Hindu Kush and the mountains beyond it. Breeders carried that solution down the mountain and refined it, but the logic of the plant is still the shape of the place. The lines referred to in what follows are drawn from the range at https://kushindicaseeds.com whose catalogue goes back to Afghanistan, northern Pakistan and the Indian Himalaya; the argument though holds to any true indica out of any shop catalogue. Knowing the terrain turns out to be the quickest way to read the pack.
The Range
The Hindu Kush stretches roughly eight hundred kilometres out of the middle of Afghanistan into northern Pakistan, and the wider indica homeland extending across to the Indian Himalaya to one side and the lowlands of the Afghan plateau to the other. The plant has been grown there over a very long time, mainly for hashish, and chosen year after year by people who wanted a plant rather than any other quality else: something that could be sieved and sieved from a plant that would have finished ahead of the autumn frost.
That is a different selection to the one that produced the equatorial sativas, in which seasons barely vary and the plant could flower for half a year. All that comes below is the consequence of a handful of conditions about the place: it is high, it is arid, its growing season is short, and its nights turn cold fast. The order in which they are discussed below hardly matters; a plant meets every one of them at season.
The Colour of a Cold Valley
High-valley nights fall under ten degrees long before the days follow, and a good number of indica populations react to the cold by producing anthocyanin, the same pigment that colours a maple leaves red. In the plant it shows as purple through the bracts, fan leaves and sometimes the stem, and it offers little for the smoker except look striking.
A thing to take from the colour is a matter of lineage, rather than cosmetic. The capacity to colour is inherited from specific high-altitude populations, and a line that colours reliably with a cool last fortnight carries the ancestry regardless of what the name claims. Strains sold as “purple” that only colour with heavy cold, or never at all, usually carry a colour in the name and nothing of it in the plant. Chilling the room during the final weeks brings the colour forward if it is present and achieves nothing if it is absent; it also checks ripening, so it is a bargain rather than a free effect.
Dry Air: Why the Buds Are Dense and Resinous
The traditional zone is arid: low humidity, hard sun, little rainfall through the late season. A plant there has two problems which its resin solves together. It must shield its flowering parts from UV exposure, and it must keep water inside the flower through a long stretch of desiccating wind. Trichomes do both: the heads block the ultraviolet and the coating reduces moisture loss. Farmers for hashish then drove the resin further, since resin was always the product.
Tight flower form goes to the same cause: a closely packed bud gives up less water than an airy one in arid air. Inside a tent these two traits arrive together, and just one of them is unconditionally an advantage. The resin is. The density turns into a risk the instant the room is humid: a bud shaped to hold water in a desert holds it just well in a damp room, and botrytis spreads through a hard indica cola more quickly than in any flower an equator has ever made. The quality that moves the seed is the one that needs a drier room in the final few weeks.
The Low Frame
A good deal of the old growing zone lies between fifteen hundred and three thousand thousand metres. Up that height the air is thin, the UV load is intense, the wind is relentless and every centimetre of stem above the ground takes resources the plant cannot afford. A tall plant on such ground loses faster, breaks sooner and gets little for the extra height, because there is no canopy it needs to outgrow.
The population that survived is low: short internodes, a strong thick main stem, branches kept close, frequently broader than it is tall. In a tent that carries over straight: a pure indica seed gains perhaps half its height over in flower whereas a sativa doubles, fits under a lamp with a short distance and seldom needs training down. Anyone short on little height choose indica for this reason, and it is the mountain, not the breeder, that those growers are thanking.
Finishing Before the Frost
At two thousand metres the growing window is brief, while the autumn comes quickly and comes decisively. A plant that needed fourteen weeks to ripen after the days started to shorten did not make seed in that terrain, and the genes left the population. The plant that stayed responds sharply to shortening days and ripens in about seven to nine weeks after the signal.
Indoors that reflex is the single most frequently valued indica quality. Flip to twelve hours and the plant moves immediately, stretches for a couple of weeks and stacks flower for the rest of a short cycle. The fastest strains at Kush Indica Seeds finish in around 7 weeks from the switch, and that allows as many as five or six harvests a year from one room where a long sativa gives two. That difference is not cleverness on the breeder’s part; it is the first snow written into the plant’s clock.
Leaves for a Thin Atmosphere
An indica fan leaf is wide, heavy and a deep green, and few broad fingers whereas a sativa fan leaf carries many thin ones. Both things about the climate favour that form. Thin air and hard sun put a high photon load per square centimetre, so a wide leaf gathers plenty and does not need needing a lot of surface; a big narrow-fingered leaf in that light simply burn. And constant wind tears fine leaves, while a thick, short-petioled leaf stays put.
The dark colour is pigment loaded thickly into a thick leaf, which is part of the same adaptation. For the tent the leaves count in a single everyday way: a dense indica canopy shades everything beneath the top tier much more completely than a sativa’s, so the lower buds of an untrained indica come in airy and loose. People that strip a few fan leaves in mid-flower are reversing, carefully, what the mountain did over many thousands of years.
Reading the Place Names
Most indica pack labels are place names or descend from them, and the names are more useful than they look. “Afghani” generally refers to a population from the north of Afghanistan, which is the classic squat, resinous, early-finishing form. “Hindu Kush” on a listing points to the central mountains proper and often to material collected on the Pakistani side. “Chitral” or “Mazar” name specific valleys with their own local types, the former often colouring and the latter large and late for an indica. Kush Indica Seeds gives the collection area on each line whenever it is known, and that makes the name from a flavour into a fact the grower can use.
Most indica packs on sale is hybrid stock several generations from the original collection, selected for consistency rather than to preserve the spread a true landrace carries; a buyer that is after the population itself has to shop for lines labelled as unselected reproductions and expect the surprises which arrive with them.
Taking the Plant Off the Mountain
Each adaptation described above was a answer to the condition that a tent no longer present, and any solution that has lost its problem does one of two ways: it becomes a free bonus or it turns into a hazard. The fast finish and the short stature become advantages, since no condition in a tent penalises them. The density and the broad canopy are costs, since the dry wind that made sense of them is gone and the damp air of a sealed room has exactly the reverse influence.
This is why the indica grow succeeds or fails on a single factor more than any other: humidity in the last few weeks. A grower that holds it down gets the dense, resinous, early harvest the mountain built; one that does not is punished with mould inside the best colas, which is exactly where the mountain had trying hardest to hold moisture in. Indoors, the mountain is to be rebuilt for the last two weeks: cool, dry, with moving air. All else about running indica is easy exactly since the plant was bred for somewhere hard.
Kush on the Label
The word that lent the mountains its name has travelled a long way from it than almost any term in cannabis. “Kush” on a current pack listing may mean a true Hindu Kush reproduction, a Californian Coast hybrid carrying one Afghan ancestor, or a strain called Kush since the breeder thought the sound of it. The OG Kush line, which accounts for most of the use of the word in the market, is probably as much sativa-leaning than many of the stock it takes the word from, while its growth habit, finishing time and leaf say as.
A usable rule is the one which holds across this page: ignore the word and go back to the terrain. A listing which gives a modest stretch, a finishing time under nine weeks, a dense flower and a wide leaf is describing a mountain plant whatever it is named; one that states a lanky frame, eleven weeks and open buds is selling something else with a mountain name. The seed carries the place it came by; the label often has forgotten.