Sativa seeds come with more jargon around them than any other category of cannabis seed, and a good deal of it means one thing to a botanist, another to a seed company and a third to the grower trying to make a decision in front of the pack. A failed sativa grow usually traces back to a word that was read in the wrong sense: a flowering time taken as a fixed number, a “sativa-dominant” label taken as a description of character, a landrace bought like it were a modern hybrid. The entries below are put together with the range at https://hazesativaseeds.com open for the concrete examples, since it leans heavily towards the classic end of the spectrum and that is where the words carry the most weight most; the meanings themselves apply to any sativa seed from any shop. They are given in no particular order, since none of them makes sense on its own without the others.
Landrace versus heirloom
A population of plants adapted through generations to one region by local growers and climate alike, rather than by modern breeding. Colombian, Colombian, Malawian and Mexican lines are the classic sativa cases. A landrace is variable, rather than a single plant: inside a pack the flowering times, flowering times and smells range far more than in a tent-bred line, and that variation is the point of keeping one.
The mistake is treating a landrace as a modern hybrid. It carries habits that made sense in an equatorial field, including height that no tent can contain and a flowering rhythm set to a equatorial daylength most growers never provide. “Heirloom” on a listing usually means a landrace that has been grown out away from its origin over a number of generations, often with a degree of selection towards tent conditions; it is nearer to manageable but nonetheless far from a hybrid. A seller offering “landrace” that does not give a origin region and a generation history is using the word loosely, and the seeds should be judged with that in mind.
Terpinolene
A aromatic compound found in large amounts in many classic sativa lines and accounting for most of the thing people describe as a “sativa” aroma: green, woody, lemon and slightly floral at once. It is fragile, driven off quickly by fast drying, and it degrades faster in the cure than the heavier terpenes which dominate indica-leaning lines.
To a seed buyer the name earns two things. Where a listing names terpinolene as the lead aromas, the strain probably has substantial old-sativa genetics whatever the label says. And where the you wants that smell to survive to the jar, the cure is going to be cool and slow; a fast dry turns a terpinolene line to something that smells of very little and leaves no trace of what the pack described.
Latitude
The single figure that decides whether a sativa will ripen outdoors, and one that no pack prints. Long-flowering plants require the run of shortening days to go on late enough for the plant finish; at high latitudes the frost arrives first, and the grower harvests a unripe plant in the end of October or loses it to mould in November. The further to the equator, within the northern hemisphere, the later the window runs, and Mediterranean or low-latitude growers are able to finish lines that temperate gardens never will.
The usable reading of a seed pack: an “outdoor” sativa harvest month is given for the breeder’s own latitude, usually a point in southern Europe or the western United States, and each step further north of that moves the date back into the weather. A grower above roughly the fiftieth parallel who wants a true sativa outdoors is shopping for an autoflower or a covered space, not a longer season.
Sativa-dominant (the label)
The marketing term rather than a botanical one. The phrase usually indicates that more of a hybrid’s lineage were classed as sativa by whoever wrote the listing, and occasionally signals no more than a certain the buds are airier or the aroma sharper than the same breeder’s indica-labelled releases.
The effect people connect with a word, clear-headed rather than heavy, is governed more by terpene profile and the THC content than by the sativa fraction, and a good number of “sativa-dominant” releases deliver a heavy sleepy effect and plenty of the opposite stock do exactly the reverse. To a grower the label is worth something as a rough hint to growth habit, flowering time and stretch; for a predictor to effect it is close to worthless without the aroma description.
Foxtailing (and when it is not a fault)
The tendency of some flowers to grow new calyx clusters on top of old ones, producing towered, irregular buds rather than round ones. In the majority of tent-bred lines it is a heat symptom, usually caused by light that is too close or temperatures too high, and the standard response is to correct the cause.
In many sativas, above all Thai and certain Haze hybrids, it is genetic and is going to occur in a flawless room. A new sativa grower frequently wastes a month chasing a fault that is a problem, lowering lights and temperatures and slowing a long plant further. The listing seldom warns which kind you should expect; the lineage usually tells you.
Hermaphroditism in long-flowering lines
The production of pollen-bearing flowers on a female plant, typically late in flower and frequently in response to stress. Almost every cannabis line has a degree of capacity for it; long-flowering plants express it more, and the reason is one plain one: fourteen weeks of flower is fourteen weeks of exposure for a light leak, a heat spike or a late watering to set it going, and a plant that has gone beyond its natural end often throws a few desperate male flowers on its own in a final effort to set seed.
Not one of these means a sativa strain weak by course; it makes the grower’s consistency matter for a longer stretch. A sealed room, steady conditions and cutting when the plant is done and not two weeks later take away most of the problem. A listing which mentions a breeder screens parents for hermaphrodite traits is worth more for a long-flowering line than for any other category.
Flowering time
The figure of weeks between the start of flowering and maturity, and the one most misread number on a sativa pack. With photoperiod seed it is measured from the day the light drops to twelve hours, rather than from germination, so a “fourteen-week” sativa started with an ordinary vegetative period is a five-month plant. Breeders additionally give the shorter end of a range, since the longer end moves fewer seed.
Long-flowering lines run anywhere from ten weeks to more than twenty, and the slowest line in the Haze Sativa Seeds range comes in at about 16 weeks after the switch. The catalogue can be sorted by this figure, which is the reasonable first step for a grower with a fixed schedule. A grower who allows four weeks to the figure the pack states is seldom disappointed.
Stretch (the doubling)
The burst of vertical growth which follows the change to flowering. Indica-leaning plants gain around half their height again; sativas commonly double, and a few equatorial types go further. The stretch lasts two to five weeks and cannot be stopped once it begins, only bent sideways by training.
In tent terms, the stretch figure is a fact to reading ahead of choosing when to flip. A sativa flipped at sixty centimetres in a two-metre tent is at the lamp by week four of flower; one flipped at thirty centimetres has room. People coming from indica stock nearly always flip too late the first time, and the consequence is visible on the ceiling of the tent.
Equatorial
Describes lines from regions in which daylength barely varies across the year, and that the plant never develop a sharp response to changing days. These lines often start flowering slowly under a conventional twelve-hour light cycle, because twelve hours is, for them, a mild unremarkable day rather than a signal.
The working fix, handed down among sativa growers over decades, is to shorten the light more: eleven hours, occasionally ten, particularly during the final weeks. It loses a little yield and buys an earlier clearer end. A listing that says “equatorial” is warning you about this with one word, and a grower that takes it as mere geography has missed the point inside it.
Haze (the family, not the smell)
Originally a particular line of plants put together in 1970s California from Mexican, Thai and Thai landraces, and later kept and worked in the Netherlands. The Haze runs tall, fills out openly, takes for twelve to sixteen weeks and carries a scent of spice, citrus and something sharp that no other line exactly reproduces.
In its second sense “Haze” is whatever hybrid that carries a share of that family, and today is most of the sativa-leaning catalogue. A listing which says “Haze” and gives no lineage may be mostly percent the classic family or one small fraction of it, and the grow character follows the fraction, not the name. The useful question is not “is it a Haze” but “how much, and through which parent”.