Sativa seeds come with more jargon around them than any other category of cannabis seed, and a good deal of it says a certain thing to a botanist, something else to a seed company and a third to the grower standing in front of the listing. The failed sativa grow nearly always goes back to a word that was understood in the wrong sense: a flowering time taken as a fixed number, a « sativa-dominant » label taken as a statement of effect, a landrace chosen like it were a modern hybrid. The entries below are written with the range at https://hazesativaseeds.com to hand as the concrete examples, because it leans heavily towards the classic end of the spectrum where the words matter most; the definitions though hold to any sativa seed from any shop. They are given in no special order, since none of them makes usable without the rest.
Haze
In its first sense a specific line of plants put together in coastal California from Colombian, Colombian and Thai parents, and later kept and refined in the Netherlands. A true Haze runs tall, fills out sparsely, flowers for twelve to sixteen weeks and carries a scent of spice, citrus and a note sharp that no other line quite has.
In its second sense « Haze » is any cross which contains some of that family, which by now is most of the sativa-leaning market. A listing that reads « Haze » without lineage may be eighty percent the classic family or one small fraction of it, and the grow character tracks the fraction, not the name. The working question is never « is it a Haze » but « how much, and via which parent ».
Sativa-dominant
A catalogue category rather than a measurable one. The phrase generally indicates that more of a hybrid’s parents were classed as sativa by the breeder who wrote the listing, and occasionally signals no more than that the buds are longer or the aroma sharper than the that breeder’s indica-labelled releases.
The experience people connect with the word, lively instead of heavy, is driven more by terpene chemistry and by cannabinoid balance than it is by the sativa fraction, and a good number of « sativa-dominant » releases produce a flat sleepy result while plenty of the opposite lines deliver exactly the opposite. To a buyer the percentage is useful as a rough hint to growth habit, flowering time and stretch; for a predictor to effect it is next to useless unless accompanied by the aroma notes.
Foxtailing (and when it is not a fault)
The habit of certain flowers to push out fresh calyx clusters on top of old ones, giving towered, irregular buds instead of dense ones. In the majority of tent-bred strains it is a heat response, typically caused by light too close or a room too high, and the advice is to fix the cause.
In many sativas, especially Southeast Asian and certain Haze lines, it is built in and is going to occur under a flawless room. A first-time sativa grower often wastes a month hunting a problem that was never there, dropping lights and temperatures and delaying a slow plant further. The breeder seldom says which kind you should expect; the parentage usually does.
Equatorial (the twelve-hour problem)
Describes lines from latitudes where daylength hardly changes through the year, and where the plant does not develop a sharp response to changing days. Such lines often flower slowly under a standard twelve-hour light cycle, since twelve hours is, to them, an ordinary day rather than a signal.
The working response, passed down between sativa growers over decades, is to shorten the light further: eleven hours, occasionally ten, particularly in the final weeks. It costs some little yield and buys a earlier clearer finish. A listing which uses « equatorial » is telling you this in one word, and a grower that takes it as mere geography misses the instruction hidden in it.
Intersex tendency
The production of male flowers on a female plant, typically towards the end in flower and often under stress. Every cannabis population carries a degree of tendency for do; long-flowering plants express it more often, and the reason is a simple reason: sixteen weeks of flower is fourteen weeks of exposure for a timer leak, a heat spike or a missed watering to set it off, and an plant plant has gone beyond its intended finish frequently produces a few late male sacs on its own as a last attempt to set seed.
None of these means a sativa strain weak by course; it makes the room’s discipline matter for a longer stretch. Light-tight tents, stable conditions and harvesting when the plant is ready and not a week after take away most of the risk. A listing that mentions the breeder tests parents for intersex tendency is saying something worth hearing on a long-flowering line than on any other category.
Latitude
The one number that decides if a sativa will ripen outdoors, and one that no pack states. Equatorial lines require a autumn days to go on long enough to let the plant to finish; in northern latitudes the frost comes first, and the grower harvests a unripe plant in late October or loses it to mould in November. The further to the equator, within a northern hemisphere, the later the window stretches, and Mediterranean and subtropical growers are able to ripen lines that northern growers never will.
The practical rule for a seed listing: an « outdoor » line harvest date is stated for the breeder’s own latitude, usually somewhere in temperate Europe or the western United States, and each degree further north of that pushes the date back towards the frost. A grower north of about the fiftieth parallel that is after a true sativa in the garden needs to be shopping for a sativa autoflower or else a greenhouse, not a better summer.
Flowering time (and what it is counted from)
The number of weeks between the start of flowering and harvest, which is the one most misread figure on a sativa pack. For photoperiod seed it is counted from the day the light drops to twelve hours, rather than from germination, so a « fourteen-week » sativa started with a ordinary vegetative period is a twenty-two-week plant. Seed companies additionally give the shorter end of a range, since the longer end sells fewer seed.
Sativa plants take everywhere from ten weeks to well over twenty, and the slowest strain in the Haze Sativa Seeds range comes in at around 16 weeks after the flip. The catalogue can be sorted by this figure, which is a sensible first step for a room on a tight timetable. A grower who adds four weeks on top of the figure the pack states is rarely caught out.
Landrace
A population of plants shaped through centuries to a particular place by the local growers and growers together, and not by deliberate selection. Thai, Thai, Congolese and Mexican lines are the sativa examples. A landrace is a spread, rather than a single plant: inside a pack the heights, finishing times and aromas spread far more than a tent-bred line, and this variation is the whole value of keeping one.
The trap is treating a landrace like a modern product. It carries habits that made sense in an equatorial field, such as a frame that no tent can hold and a flowering clock set to a daylength most growers never provide. « Heirloom » on a listing generally means a landrace that has been grown out somewhere for some generations, often with light selection for indoor life; it is closer to usable but nonetheless far from uniform. A seller offering « landrace » without a collection point and a generation count is applying the word loosely, and the seeds should be judged with that in mind.
Stretch
The surge of vertical growth which follows the change to flowering. Most tent-bred plants gain half their height again; sativas commonly double, and some equatorial lines go further. The stretch lasts three to four weeks and cannot be halted after it has started, only redirected by training.
In tent terms, the stretch figure is a fact to reading before choosing when to switch. A sativa switched at sixty centimetres in a standard tent is touching the lamp before week four of flower; one switched at thirty centimetres has room. Growers moving over from indica strains almost always flip far too late the first time, and the lesson is visible on the ceiling of the tent.
Terpinolene
A terpene found in large amounts in many classic sativa lines and responsible for much of what people mean as a « sativa » smell: fresh, woody, citrus and faintly sweet all at once. It is fragile, lost easily through hot drying, and it fades faster in storage than the earthier terpenes which dominate most tent stock.
To a seed buyer the word does two things. Where a listing names terpinolene as the lead aromas, the line probably has substantial old-sativa genetics whatever the percentage says. And when the grower wants that profile to still be there by the jar, the cure is going to be cool and slow; a fast drying room flattens a terpinolene sativa into something that smells of hay and leaves nothing of what the pack described.