Sativa seeds arrive with more jargon attached than any other category of cannabis seed, and a good deal 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 usually traces back to a word that was read in the wrong one of those senses: a flowering time taken as a promise, a “sativa-dominant” label taken as a description of effect, a landrace bought as if it were a tent-bred hybrid. The entries below were written with the range at https://hazesativaseeds.com open for reference, since it leans heavily to the classic end of the spectrum and that is where the words matter most; the definitions themselves hold to any sativa seed from any shop. They are in no particular order, since not one of them makes usable without the rest.
Equatorial
Describes plants from latitudes in which daylength barely varies through the year, and where the plant never evolved a sharp response to changing days. Such lines frequently flower slowly under a conventional twelve-hour light cycle, because twelve hours is, for them, an ordinary day rather than a signal.
The practical response, handed around between sativa growers for decades, is to shorten the light more: eleven hours, sometimes ten, particularly during the last weeks. It loses a yield yield and buys a more clearer finish. A listing that uses “equatorial” is warning you this in one word, and a grower who takes it as a note on geography has missed the point hidden in it.
Flowering time (and what it is counted from)
The figure of weeks between the start of flowering and harvest, which is the one most frequently misunderstood number on a sativa pack. For photoperiod seed it is measured from the day the light is cut to twelve hours, rather than from germination, so a “fourteen-week” sativa started with an ordinary vegetative stage is a five-month plant. Seed companies also quote the optimistic end of a range, because the other end moves less seed.
Long-flowering lines take everywhere from ten weeks to more than twenty, and the slowest strain in the Haze Sativa Seeds range is at about 16 weeks from the flip. The catalogue can be filtered by that figure, which is a reasonable first pass if you have a grower with a tight schedule. A grower who allows four weeks on top of the figure the pack says is rarely caught out.
Terpinolene
A terpene present in high proportion in a lot of old sativa strains and accounting for most of what growers describe as a “sativa” aroma: green, piney, lemon and faintly sweet at once. It is fragile, driven off easily by fast drying, and terpinolene fades faster during storage than the heavier terpenes which lead most tent stock.
For a seed buyer the name does two jobs. When a listing names terpinolene among the lead terpene, the line probably has real old-sativa ancestry regardless of what the label claims. And when the grower are after that profile to survive by the jar, the drying has to be cool and cool; a warm dry turns a terpinolene sativa to something that smells of very little and leaves no trace of what the pack promised.
Haze
Originally a specific family of plants bred in 1970s California from Colombian, Colombian and South Indian landraces, and then kept and refined in the Netherlands. A true Haze grows tall, branches openly, flowers for twelve to sixteen weeks and carries a scent of spice, citrus and a note metallic that no other other line quite has.
In its looser sense “Haze” is whatever cross that contains a share of that family, which today is most of the sativa-leaning catalogue. A listing that reads “Haze” without parents may be mostly percent original old family or one sixteenth of it, and the flowering time tracks the share, not the name. The useful question is not “is it a Haze” but “how much, and via which parent”.
Sativa-dominant
A catalogue term and not a botanical one. It generally means that the larger share of a hybrid’s parents were classed as sativa according to the breeder who wrote the description, and occasionally means nothing more than a certain the buds are longer or the smell brighter than the same breeder’s indica-labelled releases.
The effect people connect with the word, lively rather than heavy, is governed far more by terpene profile and by cannabinoid content than by ancestry, and a good number of “sativa-dominant” hybrids deliver a heavy couch effect and a good number of indica-labelled lines deliver exactly the reverse. To a buyer the label is worth something for a loose hint to growth habit, flowering time and stretch; as a guide to how it feels it is close to worthless unless accompanied by the terpene notes.
Stretch (the doubling)
The surge of vertical growth which follows the change to flowering. Indica-leaning plants add half again; sativas commonly double, and a few landrace types triple. The stretch lasts three to five weeks and cannot be halted once it has started, only redirected by training.
In tent terms, the stretch figure is a number worth reading before deciding when to flip. A sativa switched at sixty centimetres inside a standard tent is touching the lamp by week four of flower; one flipped at thirty centimetres centimetres has room. People moving from indica stock almost always switch too late the first time, and the lesson is visible on the ceiling of the tent.
Latitude
The one number that decides if a sativa can finish outdoors, and a number that no pack states. Long-flowering plants need the autumn days to continue late enough for the plant to finish; at high latitudes the frost comes before that, and the grower harvests an half-finished plant in the end of October or loses it rot in November. A further to the equator, in a northern hemisphere, the later the window stretches, and coastal and subtropical growers are able to finish plants that northern growers never will.
The usable rule of a seed pack: an “outdoor” line harvest month is stated for the breeder’s home latitude, usually a point within southern Europe or the western United States, and each degree further north of it pushes the date later into the frost. A grower north of about the fiftieth parallel that wants a true sativa in the garden needs to be looking for a sativa autoflower or else a covered space, and not a better season.
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 population has some capacity to do; sativa plants show it more, and the reason is a plain reason: sixteen weeks of flower is sixteen weeks of opportunity for a timer leak, a heat spike or a missed watering to set it off, and an old plant has waited past its intended end often throws a few late male flowers on its own as a final effort to set seed.
Not one of these means a sativa strain unstable as a matter of nature; it means the room’s discipline count for longer. Light-tight tents, steady conditions and harvesting the moment the plant is done rather than two week later take away most of the risk. A listing that mentions the breeder tests parents for hermaphrodite tendency is worth worth hearing on a long-flowering line than on anything else.
Landrace versus heirloom
A population of plants adapted through centuries to one region by local climate and climate together, rather than by modern selection. Thai, Thai, Congolese and Oaxacan lines are the classic sativa cases. A landrace is variable, rather than a single plant: inside a pack the flowering times, finishing times and smells range far more than in any tent-bred line, and that variation is the whole value of keeping one.
The mistake is treating a landrace like a modern product. It carries habits that make sense in an equatorial field, such as height no tent can hold and a flowering clock set to a daylength most growers cannot offer. “Heirloom” in a listing generally refers to a landrace that has been grown out away from its origin over some generations, typically with a degree of selection towards tent life; it is nearer to manageable but nonetheless not uniform. A seller offering “landrace” that does not give an collection region and a reproduction count is applying the word loosely, and the pack should be judged accordingly.
Foxtailing (and when it is not a fault)
The tendency of some flowers to push out new calyx clusters on top of old ones, giving towered, irregular buds rather than round ones. In the majority of tent-bred lines it is a stress symptom, usually caused by light too close or a room too high, and the advice is to fix the cause.
In a good number of sativas, especially Thai and some Haze hybrids, it is genetic and will happen under a perfect room. A first-time sativa grower often spends weeks hunting a problem that is there, lowering lights and temperatures and slowing a long plant further. The listing rarely says which kind to expect; the lineage usually does.
