Each quality that sells an indica seed has been put there by a range of mountains. The short stature, the seven-to-nine-week flowering, the dense frosted buds, the wide blue-green leaf, the purple that appears as the nights go cold: not one of them is an design. They are the solutions a population arrived at over many thousands of years to a particular combination of pressures, in high altitude, in a short dry, cold season, on the valleys of the Hindu Kush and the mountains around it. Breeders took that answer off the mountain and polished it, yet the shape of the plant is still the logic of the place. The lines referred to below are drawn from the range at https://kushindicaseeds.com whose catalogue traces to Afghanistan, northern Pakistan and the Indian Himalaya; the account itself applies to any true indica from 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 from central Afghanistan into northern Pakistan, and the wider indica homeland extending across into the Indian Himalaya to one side and the lowlands of the Afghan interior on the other. The plant has been cultivated there for centuries, chiefly for hashish, and selected year by generation by farmers who wanted resin rather than anything else: something that could be sieved or pressed off a plant that had finished before the first snow.
This is a different selection from the one that shaped the equatorial sativas, where daylength barely vary and the plant could grow for half a year. Everything that follows is a outcome of a handful of facts about the place: it is high, it is dry, its summer is short, and its nights turn cold fast. The order in which they are discussed below hardly matters; a plant experiences all of them in the same once.
Wind and Sun: Why the Leaf Is Broad and Dark
An indica fan leaf is broad, thick and dark, and only a few wide lobes where a sativa fan leaf has many narrow ones. Two pressures about the terrain favour the broad shape. Thin air and hard sun mean an heavy light load per square centimetre, so a broad leaf catches plenty and does not need needing a lot of surface; a big narrow-fingered leaf would just burn. And steady wind shreds thin leaves, while a stout, short-stalked leaf stays put.
The deep colour is chlorophyll packed thickly in a thick leaf, which is part of the same answer. To the grower the features count in a single practical respect: a dense indica canopy blocks light from all growth beneath the top layer much more completely than a sativa’s, which means the lower buds on an untrained indica come in airy and loose. Growers who strip a large leaves in mid-flower are undoing, a little, what the range did for many thousands of years.
Altitude: Why the Plant Is Short
Much of the traditional growing land lies between a thousand five hundred and three thousand metres. At that height the air is thin, the ultraviolet load is intense, the wind is relentless and every centimetre of stem over the ground takes water the plant cannot spare. A tall plant on that terrain loses faster, breaks sooner and gains nothing for its height, since there is no canopy it needs to outgrow.
The plant which persisted is low: tight internodes, a single thick main stem, side branches held close, often broader than it is tall. In a tent that carries over straight: a pure indica seed gains perhaps half its height again through flower whereas a sativa doubles, fits beneath a lamp at a modest short distance and rarely requires tying at all. Growers short on little headroom choose indica for this reason, and it is the mountain, not the breeder, that they are thanking.
Dry Air: Why the Buds Are Dense and Resinous
The old homeland is arid: thin humidity, intense sun, rare rainfall in the late summer. A plant there has two problems which resin answers at once. It needs to shield its reproductive parts from ultraviolet light, and it must keep moisture inside the bud over a long stretch of desiccating wind. A heavy coat of trichomes do both: the resin heads block the ultraviolet and the waxy layer slows moisture loss. Selection for hashish on top of that drove the resin further, since resin was the product.
Dense flower form belongs to the same story: a closely packed bud loses less water than an open one in dry air. In a tent these same traits come as a pair, and just one of them is unconditionally an advantage. The resin is. The density turns into a risk the instant the room is damp: a bud shaped to retain water in a desert holds it just as well in a damp room, and bud rot spreads in a hard indica cola more quickly than through any flower the equator ever produced. The quality that moves the seed is the one that calls for a drier room in the last few weeks.
Anthocyanin and the Autumn
Mountain nights fall below ten degrees long before the days follow, and a good number of indica populations respond to the cold by making anthocyanin, the same compound that turns autumn leaf red. On the plant it appears as purple in the bracts, fan leaves and sometimes the stem, and it does nothing for the smoker except looking striking.
The thing to take from the colour is genetic, not decorative. The capacity to turn is inherited from specific high-altitude stock, and a strain that colours reliably with a cold final fortnight carries the origin whatever the name claims. Strains sold as “purple” that will only colour with extreme cold, or never really, usually have the word in only the name and nothing of it in the plant. Chilling the room in the last weeks brings the colour forward where it exists and achieves nothing where it does not; it at the same time checks the finish, so it is a bargain rather than a free effect.
Seven Weeks Before the Snow
At two thousand metres the frost-free window is brief, and the autumn comes quickly and decisively. A plant that took fourteen weeks to ripen after the days began to shorten did not set seed on such terrain, and its genes dropped out of the population. What remained responds fast to shortening days and ripens in roughly seven to nine weeks after that cue.
Indoors that response is the single most frequently cited indica trait. Flip to twelve hours and the plant moves immediately, grows for a couple of weeks and fills flower over the rest of a brief run. The quickest lines at Kush Indica Seeds come in at about 7 weeks after the flip, which allows as many as five or six cycles a year from one room where a classic sativa allows two. That difference is no efficiency on the breeder’s part; it is the first snow written into the plant’s own clock.
The Valley Names on the Pack
Most indica seed labels carry the names of places or descend from them, and the names are far more useful than they realise. “Afghani” generally refers to a population out of the north of Afghanistan, which is a typical short, resinous, fast-finishing type. “Hindu Kush” in a listing points to the high range itself and frequently to material taken on the Pakistani side. “Chitral” or “Mazar” name particular valleys that have their own recognisable types, the former often colouring and the second large and late for an indica. Kush Indica Seeds gives the origin region for each pack whenever it is known, and that turns the name from a brand into a fact the grower can use.
Almost all indica packs on sale are worked material several generations removed from the original collection, selected for consistency rather than to preserve the spread of a pure landrace holds; a buyer that is after the population itself has to shop for lines described as pure landrace stock and expect the variation which arrive with them.
What Changes in a Tent
Every adaptation described above was an solution to the condition that a tent no longer present, and a trait that has lost its problem behaves either of two things: it becomes a cost-free bonus or it turns into a cost. The speed and the low stature become bonuses, because no condition in a room penalises them. The density and the broad leaf are costs, because the dry wind that justified them is absent and the still atmosphere of a sealed room has exactly the opposite effect.
This is why an indica grow goes well or fails in a single factor more than any other: humidity during the final few weeks. A person that keeps it down is rewarded with the dense, resinous, early harvest the mountain built; one who lets it rise gets mould in the thickest colas, where the the mountain was arranged hardest to hold water in. Indoors, the mountain is to be rebuilt in the last two weeks: cool, dry, with moving air. All that remains about growing indica is easy exactly since the plant was bred to survive a place hard.
The Drift of a Word
The word that gave the mountains its name has since moved further from it than any term in cannabis. “Kush” in a modern seed listing may mean an unselected Hindu Kush reproduction, a West Coast hybrid carrying one Afghan grandparent, or a strain called Kush because the seller liked the sound would sell. The famous OG Kush line, and this dominates the use of the word in the market, is probably more sativa-leaning than many of the stock it borrows the word from, while its growth habit, flowering time and leaf show as.
A usable reading is the same one which applies throughout this article: ignore the word and read the terrain. A listing which gives an modest stretch, a flowering time under nine weeks, a dense flower and a wide leaf is selling a mountain plant whatever it is named; one that states a lanky habit, twelve weeks and airy buds is describing a plant from else with a mountain name. The seed remembers where it came from; the label often does not.