Sativa seeds arrive with more vocabulary attached than any other category of cannabis seed, and most of it says 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 listing. A failed sativa grow nearly always traces back to a word that was read in the wrong one of those senses: a flowering time read as a fixed number, a “sativa-dominant” tag taken as a description of character, a landrace bought like it were a modern hybrid. The entries below are written with the range at https://hazesativaseeds.com open as reference, because it runs heavily towards the classic end of the category and that is where the vocabulary matter most; the definitions though apply to any sativa seed from any shop. They are given in no special order, because none of them makes sense on its own without the others.
Flowering time
The figure of weeks from the start of flowering and harvest, which is the one most misunderstood number on a sativa pack. With photoperiod seed it is counted from the day the light drops to twelve hours, not from sowing, so a “fourteen-week” sativa started with a eight-week vegetative period is a twenty-two-week plant. Seed companies also give the optimistic end of a spread, since the other end sells less seed.
Sativa plants take anywhere from ten weeks to well over twenty, and the longest strain in the Haze Sativa Seeds range is at around 16 weeks from the switch. The catalogue can be sorted by that figure, which is a sensible first pass for a grower on a fixed timetable. A grower who allows four weeks on top of the figure the pack says is rarely caught out.
Latitude
The single figure that determines whether a sativa can finish outdoors, and a number that no pack prints. Equatorial plants require the autumn days to continue late enough to let the plant finish; in northern latitudes the frost comes before that, and the grower cuts a half-finished plant in late October or else loses it to mould in November. A further to the equator, within a northern hemisphere, the later the season runs, and coastal or low-latitude growers are able to finish lines that temperate gardens cannot.
The usable reading of a seed listing: an “outdoor” sativa finishing date is stated for the breeder’s home latitude, usually a point in temperate Europe or the western United States, and each step further north of it pushes the finish back into the frost. A grower north of about the fiftieth parallel that wants a long-flowering sativa outdoors is looking for a sativa autoflower or else a covered space, and not a longer season.
Terpinolene
A aromatic compound present in large amounts in a lot of classic sativa strains and accounting for most of the thing people describe as the “sativa” aroma: fresh, piney, lemon and faintly sweet at once. It is fragile, lost quickly through hot drying, and terpinolene degrades faster in the cure than the earthier terpenes that lead most tent stock.
To a seed buyer the word earns two things. When a listing names terpinolene as the lead terpene, the line probably carries substantial old-sativa ancestry whatever the percentage says. And where the you wants that smell to survive to the jar, the cure has to be cool and slow; a warm drying room turns a terpinolene sativa into something that tastes of hay and leaves nothing of what the pack described.
Stretch
The surge of upward growth that comes after the switch to flowering. Indica-leaning plants gain around half their height again; sativas routinely double, and a few landrace lines triple. The stretch continues two to four weeks and will not be stopped once it has started, only redirected by training.
In tent terms, the stretch figure is a number to reading ahead of deciding when to switch. A sativa flipped at sixty centimetres inside a two-metre tent is touching the lamp by week four of flower; one switched at thirty centimetres centimetres has room. Growers moving over from indica stock almost always flip too late the first time, and the lesson is written on the ceiling of the tent.
Foxtailing (and when it is not a fault)
The habit of some flowers to grow fresh bud growth on top of old ones, producing spired, open buds instead of dense ones. In most tent-bred lines it is a stress response, usually caused by light that is too close or temperatures too high, and the standard response is to correct the room.
In many sativas, especially Southeast Asian and certain Haze hybrids, it is genetic and will occur in a flawless room. A first-time sativa grower frequently spends a month chasing a problem that was never not there, dropping lights and heat and slowing an already slow flower even more. The breeder rarely warns which type you should expect; the lineage usually tells you.
Sativa-dominant (the label)
A catalogue category rather than a botanical one. The phrase generally indicates that more of a hybrid’s lineage were classed as sativa by the breeder who drafted the description, which sometimes means no more than that the buds are longer or the smell brighter than the that breeder’s other lines.
The experience people associate with the word, lively rather than heavy, is governed far more by terpene profile and by THC content than it is by the sativa fraction, and plenty of “sativa-dominant” releases produce a heavy sleepy result while plenty of indica-labelled lines deliver exactly the reverse. To a grower the label is worth something as a loose guide to growth habit, flowering time and stretch; for a guide to effect it is close to worthless without the terpene description.
Equatorial
Describes lines out of latitudes where daylength hardly changes across the year, which means that the plant never evolved a sharp reaction to changing days. Such plants often flower reluctantly under a conventional twelve-hour light cycle, since twelve hours is, for them, a mild unremarkable day rather than a signal.
The practical fix, passed around between sativa growers over decades, is to cut the light further: eleven hours, sometimes ten, particularly in the last weeks. It costs a yield yield and gains a earlier clearer finish. A listing which says “equatorial” is warning you this with one word, and a grower who takes it as a note on origin misses the instruction inside it.
Landrace
A population of plants shaped over centuries to a particular region by the local climate and climate alike, rather than by deliberate breeding. Thai, Thai, Malawian and Oaxacan lines are the sativa cases. A landrace is a spread, not a one plant: inside a pack the flowering times, finishing times and smells range widely than a tent-bred hybrid, and that spread is the whole value of growing one.
The trap is buying a landrace like a finished product. It carries traits that made sense in an equatorial field, including a frame that no tent can hold and a flowering rhythm set to an daylength the majority of growers cannot provide. “Heirloom” in a listing usually refers to a landrace that has been reproduced away from its origin over a number of generations, typically with a degree of selection towards indoor conditions; it is nearer to usable but nonetheless not a hybrid. A shop listing “landrace” without an collection region and a generation count is using the word as a flavour, and the seeds should be priced accordingly.
Intersex tendency
The production of male flowers on a female plant, typically late in flower and frequently under stress. Almost every cannabis population carries some tendency for do; sativa plants express it more often, for a plain one: fourteen weeks of flower is fourteen weeks of exposure for a light leak, a temperature spike or a missed watering that can trigger it going, and a old that has already gone past its natural end often produces a few desperate pollen flowers on its own in a final effort to set seed.
None of these makes a sativa line unstable as a matter of nature; it makes the grower’s discipline count over longer. Light-tight room, stable conditions and harvesting the moment the plant is ready rather than two weeks later remove the greater part of the problem. A listing that mentions a breeder screens parents for intersex traits is worth worth hearing for a long-flowering line than for anything other category.
Haze (the family, not the smell)
In its first sense a particular family of plants put together in 1970s California from Colombian, Colombian and Thai parents, and later kept and refined in the Netherlands. A true Haze grows tall, fills out sparsely, takes for twelve to sixteen weeks and carries a scent of incense, citrus and something metallic that no other line quite has.
In its looser sense “Haze” is any hybrid that carries a share of that family, and by now is most of the sativa-leaning catalogue. A listing that says “Haze” without lineage may be eighty percent the classic family or a sixteenth of it, and the flowering character tracks the fraction, not the name. The useful question is never “is it a Haze” but “how much, and via which parent”.