Each quality that sells an indica seed has been put there by a mountain. The squat frame, the fast flowering, the hard resinous flowers, the broad dark leaf, the purple that comes in as the nights turn cold: none of these is a breeder’s invention. They are the answers a population found through thousands of years to a specific set of problems, at high altitude, in a short dry, cold season, on the slopes of the Hindu Kush and the mountains around it. Modern breeding carried that answer down the mountain and refined it, yet the shape of the plant is to this day the logic of the terrain. The examples pointed to in what follows are drawn from the range at https://kushindicaseeds.com and its catalogue goes back to Afghanistan, northern Pakistan and the Indian Himalaya; the account though holds to any genuine indica out of any shop bank. Reading the terrain turns out to be the most reliable way to understand the pack.
A Dry Corner of Central Asia
The Hindu Kush runs for about eight hundred kilometres from central Afghanistan towards northern Pakistan, and the wider indica zone extending across into the Indian Himalaya on one side and the deserts of the Central Asian plateau to the other. Cannabis has been grown there over a very long time, mainly for hashish, which means chosen generation after generation by farmers who needed a plant above anything else: something that could be rubbed and sieved off a plant that would have ripened before the first frost.
This is a different selection from the one that shaped the equatorial sativas, where daylength hardly change and the plant could flower for most of a year. All that comes below is a consequence of a handful of facts about the terrain: it is high, it is arid, its growing season is short, and its nights turn cold fast. The sequence that they are taken here hardly matters; a plant experiences every one of them in the same season.
Finishing Before the Frost
Above two thousand metres the growing season is brief, while the autumn arrives early and comes decisively. A plant which took fourteen weeks to ripen from the days began to draw in did not make seed on such ground, so its genes left the population. The plant that stayed responds sharply to shortening days and finishes in roughly seven to nine weeks from the signal.
Indoors that response is the single most valued indica trait. Flip to twelve hours and the plant moves immediately, stretches for a fortnight and fills flower for the remainder of a short cycle. The fastest strains at Kush Indica Seeds come in in about 7 weeks after the switch, which allows as many as five or six cycles a year out of one room whereas a classic sativa allows perhaps two. That difference is not cleverness on the breeder’s side; it is the snowline encoded into the plant’s calendar.
Anthocyanin and the Autumn
High-valley nights drop below ten degrees long before the days do, and many indica lines respond to that cold by making anthocyanin, the same pigment that colours autumn leaf purple. In the plant it shows as purple in the calyxes, leaves and occasionally the stem, and it offers little for the smoker except looking beautiful.
The point worth taking from the colour is genetic, rather than decorative. The tendency to turn is inherited from particular cold-valley populations, and a strain that colours reliably in a cold last two weeks has the origin regardless of what the name claims. Lines sold as “purple” that will only turn with extreme cold, or not really, usually carry the colour in the name and not in the genes. Chilling the room in the final weeks brings the colour out if it is present and does nothing at all if it is absent; it also checks ripening, so it is a bargain rather than a costless trick.
Resin as Sunscreen and Sealant
The old zone is arid: low humidity, hard sun, rare rain through the late summer. A plant there has two problems which resin solves at once. It needs to shield its flowering tissue from ultraviolet exposure, and it needs to hold water inside the flower over a long stretch of desiccating wind. A heavy coat of trichomes do both: the heads absorb the ultraviolet and their coating reduces water loss. Selection for hashish then drove the resin even harder, since resin was always the crop.
Tight flower structure belongs with the same cause: a closely clustered bud loses less water than an airy one in dry air. Inside a tent those same traits come together, and just one of them is always an advantage. The resin is. The density turns into a risk the instant the air is damp: a bud shaped to retain water in a desert retains it just well in a wet tent, and botrytis spreads in a dense indica cola more quickly than through anything the equator has ever produced. The quality that moves the seed is the one that needs a drier room during the final three weeks.
Altitude: Why the Plant Is Short
A good deal of the old growing zone lies between a thousand five hundred and three thousand metres. Up that height the air is thin, the UV load is heavy, the wind is relentless and each centimetre of stem above the soil costs resources the plant cannot afford. A tall plant on such ground loses more, breaks sooner and gains little for its extra height, because there is no canopy to clear.
The plant that survived is low: tight internodes, a single thick central stem, side branches held close, frequently wider than it is tall. In a tent that translates directly: a true indica seed gains maybe half its height over through flower whereas a sativa doubles, fits beneath a light at a short gap and seldom requires tying at all. Anyone short on little headroom choose indica for precisely this reason, and it is the mountain, not the breeder, that those growers are thanking.
Wind and Sun: Why the Leaf Is Broad and Dark
The indica fan leaf is broad, heavy and dark, and only a few wide lobes where a sativa leaf carries more narrow ones. Two things about the climate favour the broad shape. Thin air and intense sun put an heavy light load per square centimetre, and a wide leaf catches plenty and does not need a lot of area; a big thin leaf in that light just scorch. And constant wind shreds thin leaves, whereas a stout, short-stalked leaf holds.
The deep colour is pigment packed densely into a thick leaf, which is one part of the same adaptation. To the tent these features count in a single practical respect: a dense indica canopy shades all growth beneath the top layer far more thoroughly than a sativa’s, so lower buds on an untrained indica finish in airy and loose. People that remove a few fan leaves in week three are undoing, carefully, something the range did for many thousands of years.
Reading the Place Names
Most indica seed names carry place places or derive from one, and the places are more useful than most buyers realise. “Afghani” generally means stock from the Mazar-i-Sharif of Afghanistan, and a typical squat, resinous, fast-finishing form. “Hindu Kush” in a name points to the central mountains proper and frequently to material collected on the Pakistani side. “Chitral” or “Mazar” name particular valleys with their own recognisable forms, the first often colouring and the latter large and slower for an indica. Kush Indica Seeds gives the collection region on every pack whenever it is documented, and that turns the name from a flavour into a fact the grower can use.
Most indica packs on sale is hybrid stock many generations from the original collection, selected for uniformity rather than to preserve the spread a true landrace carries; a buyer who is after the population itself has to shop for lines described as pure landrace stock and expect the variation that come with the label.
What Changes in a Tent
Every adaptation described above was a answer to the pressure which a tent does not present, and a solution without its problem does one of two things: it turns into a cost-free bonus or it turns into a cost. The speed and the short stature become advantages, since nothing in a tent punishes a plant for them. The density and the broad leaf are costs, since the arid air that made sense of them is gone and the damp atmosphere of a sealed room does exactly the reverse effect.
This is why the indica grow succeeds or fails in a single variable more than on any other: humidity during the last three weeks. A grower that holds it down gets the dense, frosted, fast harvest the mountain built; one who does not is punished with rot inside the thickest colas, where the the plant had trying hardest to keep moisture in. In a room, the terrain is to be rebuilt in the final fortnight: cool, dry, with moving air. Everything that remains about running indica is easy precisely because the population was bred to survive a place hard.
Kush on the Label
The word that gave the mountains its name has since travelled a long way from it than any other in cannabis. “Kush” on a current seed listing may refer to a true Hindu Kush reproduction, a Californian Coast hybrid carrying one Afghan ancestor, or a strain named Kush because the seller thought the sound would sell. The OG Kush line, and this accounts for most of the appearances of the word today, is most likely as much sativa-influenced than many of the stock it takes the name from, while its growth habit, flowering time and leaf shape say as much much.
The usable reading is the same one which holds throughout this page: ignore the word and read the terrain. A listing which gives a low stretch, a finishing time below nine weeks, a hard flower and a wide leaf is describing a mountain plant whatever it is named; one that states a tall frame, twelve weeks and airy flowers is selling a plant from somewhere else wearing a borrowed name. The seed remembers where it came by; the label often has forgotten.