Sativa seeds come with more jargon around them than any other kind of cannabis seed, and most of it says a certain thing to a botanist, something else to a breeder and something different again to the grower trying to make a decision in front of the listing. The failed sativa grow nearly always traces back to a word that was understood in the wrong sense: a flowering time taken as a fixed number, a “sativa-dominant” tag taken as a statement of effect, a landrace bought as if it were a tent-bred hybrid. The entries below are written with the range at https://hazesativaseeds.com open for reference, since it leans heavily to the classic end of the spectrum where the vocabulary matter most; the definitions themselves apply to any sativa seed from any shop. They are given in no particular order, since not one of them makes sense on its own without the rest.
Equatorial (the twelve-hour problem)
Describes lines from regions in which daylength barely changes across the year, which means that the plant does not evolved a strong response to changing days. These plants frequently start flowering reluctantly at a conventional twelve-hour schedule, because twelve hours is, to them, a mild unremarkable day rather than a signal.
The working response, handed down among sativa growers for decades, is to cut the light more: eleven hours, occasionally ten, particularly in the last weeks. It loses a yield yield and gains an more clearer finish. A listing that says “equatorial” is warning you about this with one word, and a grower who reads it as mere origin misses the point hidden in it.
Flowering time
The number of weeks from the start of flowering and maturity, and the single most misread figure on a sativa pack. With photoperiod seed it is measured from the day the light drops to twelve hours, not from sowing, so a “fourteen-week” sativa grown after a ordinary vegetative period is a five-month plant. Breeders also give the shorter end of a spread, since the longer end sells less seed.
Sativa lines run everywhere from ten weeks to well over twenty, and the longest line in the Haze Sativa Seeds range comes in at about 16 weeks after the flip. The catalogue can be filtered by this figure, which is a sensible first pass for a room with a tight timetable. A grower who adds four weeks on top of whatever the pack says is seldom caught out.
Latitude (outdoor sativas)
The single figure that decides if a sativa will finish outdoors, and one no pack states. Long-flowering plants require the run of shortening days to go on late enough for the plant ripen; in northern latitudes the frost arrives first, and the grower cuts a half-finished plant in the end of October or else loses it to mould in November. A closer south, within the northern hemisphere, the later the window runs, and Mediterranean and low-latitude growers are able to finish plants that temperate growers cannot.
The usable rule for a seed listing: an “outdoor” line finishing date is given for the breeder’s home latitude, normally a point within southern Europe or the west coast of the United States, and every degree north of that moves the date later towards the frost. A grower above roughly the fiftieth parallel that is after a long-flowering sativa outdoors is looking for an autoflower or else a covered space, and not a better summer.
Terpinolene
A aromatic compound present in high amounts in many old sativa lines and accounting for most of what growers mean as the “sativa” smell: green, woody, lemon and faintly sweet at once. It is fragile, driven off easily by hot drying, and terpinolene degrades faster in storage than the earthier terpenes that lead most tent stock.
For a seed buyer the word does two jobs. Where a listing names terpinolene among the lead aromas, the line most likely carries real Haze-era genetics whatever the percentage claims. And when the grower wants that profile to still be there by the jar, the cure has to be cool and cool; a warm dry flattens a terpinolene sativa to a flower that smells of hay and leaves nothing of what the pack described.
Landrace versus heirloom
A population of plants adapted over generations to one region by local growers and climate together, and not by deliberate selection. Colombian, Thai, Congolese and Mexican stock are the classic sativa examples. A landrace is variable, not a one plant: within a pack the heights, flowering times and aromas spread far more than any tent-bred line, and this variation is the whole value of keeping one.
The trap is buying a landrace like a modern product. It carries traits that make sense in an equatorial field, such as height no tent can hold and a flowering clock tuned to a equatorial daylength the majority of growers cannot offer. “Heirloom” on a listing generally means a landrace that has been grown out away from its origin for a number of generations, typically with a degree of selection towards indoor life; it is nearer to usable but nonetheless far from uniform. A shop listing “landrace” without a collection region and a generation history is using the word loosely, and the seeds should be priced accordingly.
Hermaphroditism in long-flowering lines
The appearance of male flowers on a female plant, typically towards the end in flower and often under stress. Almost every cannabis line carries a degree of capacity for do; long-flowering lines show it more, for a plain one: sixteen weeks of flower is fourteen weeks of exposure for a timer leak, a heat spike or a late watering to set it off, and an old that has gone past its intended finish frequently produces a few desperate male sacs on its own in a last effort to set seed.
Not one of these makes a sativa strain unstable by course; it means the grower’s consistency matter over a longer stretch. Light-tight room, steady conditions and harvesting the moment the plant is done and not a weeks after remove the greater part of the problem. A listing which mentions a breeder screens parents for intersex traits is worth more on a sativa than on any other category.
Stretch
The burst of vertical growth that comes after the switch to flowering. Indica-leaning plants gain around half again; sativas commonly double, and some landrace lines triple. The stretch continues two to four weeks and will not be halted after it begins, merely bent sideways by training.
In tent terms, a stretch figure is the fact to reading ahead of deciding when to switch. A sativa switched at sixty centimetres inside a standard tent is at the lamp before week four of flower; one flipped at thirty centimetres centimetres has room. People moving over from indica strains nearly always flip too late the first time, and the consequence is written on the ceiling of the tent.
Foxtailing
The tendency of certain flowers to push out new bud growth on top of existing ones, giving towered, irregular buds rather than dense ones. In most tent-bred lines it is a heat response, usually caused by light that is too close or temperatures too high, and the standard response is to fix the cause.
In many sativas, above all Thai and certain Haze lines, it is built in and will happen in a flawless room. A first-time sativa grower frequently spends weeks hunting a problem that is a problem, dropping lights and heat and delaying a long plant even more. The listing seldom warns which kind to expect; the parentage usually tells you.
Haze (the family, not the smell)
In its first sense a particular family of plants put together in 1970s California from Mexican, Thai and Thai parents, and later preserved and refined in the Netherlands. A true Haze grows tall, branches openly, takes for twelve to sixteen weeks and smells of incense, citrus and something sharp that no line quite has.
In its second sense “Haze” is any cross which carries a share of that family, which by now is most of the sativa-leaning catalogue. A listing that reads “Haze” without lineage could be eighty percent the old family or one sixteenth of it, and the flowering character follows the share, not the name. The useful question is not “is it a Haze” but “how much, and via which parent”.
Sativa-dominant (the label)
The catalogue term and not a measurable one. It usually indicates that more of a hybrid’s lineage are classed as sativa by the breeder who wrote the description, and sometimes means nothing more than a certain the flowers are airier or the aroma brighter than the same breeder’s other lines.
The effect people associate with the word, lively instead of sedating, is driven more by terpene profile and the THC balance than by the sativa fraction, and a good number of “sativa-dominant” hybrids deliver a flat couch effect and plenty of the opposite stock do the opposite. To a grower the label is worth something for a loose hint to growth habit, flowering time and stretch; as a predictor to effect it is close to worthless without the aroma description.