Sativa seeds arrive with more jargon around them than any other kind 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 person trying to make a decision in front of the listing. A disappointing sativa grow nearly always goes back to a word that was read 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 like it were a modern hybrid. The entries below were put together with the range at https://hazesativaseeds.com to hand as the concrete examples, since it leans heavily towards the classic end of the category and that is where the words matter most; the definitions though apply to any sativa seed from any seller. They are given in no special order, because none of them is usable without the rest.
Flowering time
The figure of weeks from the start of flowering and harvest, which is the single most frequently misunderstood figure 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 after an eight-week vegetative period is a twenty-two-week plant. Seed companies additionally give the shorter end of the spread, because the longer end sells less seed.
Sativa plants take everywhere from ten weeks to well over twenty, and the longest line in the Haze Sativa Seeds range is at about 16 weeks from the switch. The catalogue can be filtered by that number, which is the sensible first step for a room on a fixed schedule. A grower who adds four weeks to whatever the pack says is rarely caught out.
Stretch
The burst of upward growth that follows the change to flowering. Most tent-bred plants gain around half their height again; sativas commonly double, and some landrace lines triple. The stretch lasts two to four weeks and cannot be stopped once it has started, only bent sideways by training.
In practical terms, the 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 has room. People moving from indica strains nearly always flip too late the first time, and the consequence is visible on the ceiling of the tent.
Terpinolene (the “sativa smell”)
A terpene found in large proportion in many old sativa lines and accounting for much of the thing people describe as a “sativa” aroma: fresh, woody, citrus and faintly floral all at once. It is fragile, driven off quickly by hot drying, and terpinolene degrades more quickly in the cure than the earthier terpenes that lead indica-leaning lines.
To a seed buyer the name does two jobs. When a listing names terpinolene among the leading aromas, the strain most likely carries substantial old-sativa genetics regardless of what the label says. And where the you are after that smell to still be there to the jar, the drying is going to be slow and slow; a fast dry flattens a terpinolene sativa to a flower that smells of very little and leaves nothing of what the pack described.
Latitude
The one number that determines whether a sativa will finish outdoors, and a number no pack states. Long-flowering lines need the run of shortening days to go on late enough to let the plant to ripen; at northern latitudes the frost comes before that, and the grower cuts a half-finished plant in late October or watches it rot in November. A closer to the equator, within a northern hemisphere, the later the window stretches, and Mediterranean and subtropical gardens can ripen lines that temperate gardens cannot.
The practical reading of a seed listing: an “outdoor” line finishing date is stated for the breeder’s own latitude, normally a point within southern Europe or the western United States, and each step north of it moves the finish later into the frost. A grower above about the fiftieth parallel who wants a true sativa outdoors is looking for a sativa autoflower or else a covered space, and not a better season.
Foxtailing
The habit of certain flowers to push out new calyx growth on top of old ones, giving spired, irregular buds instead of round ones. In most indica-leaning strains it is a heat symptom, typically caused by light that is too close or temperatures that is too high, and the advice is to correct the cause.
In a good number of sativas, above all Thai and certain Haze hybrids, it is genetic and is going to happen under a perfect room. A first-time sativa grower frequently wastes a month hunting a fault that is a problem, dropping lights and heat and delaying a slow plant even more. The breeder seldom warns which kind you should expect; the lineage usually tells you.
Haze
Originally a specific family of plants bred in 1970s California from Mexican, Thai and Thai parents, and later kept and refined in the Netherlands. A true Haze grows tall, fills out openly, flowers for twelve sixteen weeks and smells of spice, pine and something metallic that no other other line exactly has.
In its second sense “Haze” is any hybrid that contains some of that family, and today is a great many of the sativa-leaning catalogue. A listing which says “Haze” without lineage could be eighty percent the old family or a sixteenth of it, and the grow time tracks the share, not the name. The useful question is never “is it a Haze” but “how much, and via which parent”.
Sativa-dominant
The marketing category rather than a botanical one. It generally indicates that the larger share of a hybrid’s parents are described as sativa according to whoever drafted the listing, which occasionally means no more than a certain the buds are longer or the smell brighter than the that breeder’s other lines.
The experience people associate with a word, clear-headed rather than heavy, is driven more by terpene profile and the THC content than it is by the sativa fraction, and plenty of “sativa-dominant” hybrids produce a heavy sleepy effect and a good number of the opposite lines do the reverse. For a grower the label is worth something for a loose guide to growth habit, flowering time and stretch; for a guide to how it feels it is next to useless without the aroma description.
Equatorial
Refers to plants out of latitudes where daylength barely varies through the year, and where the plant does not evolved a sharp response to shortening days. Such lines often flower slowly under a standard twelve-hour schedule, since twelve hours is, to them, a mild ordinary day and not a signal.
The practical response, handed down among sativa growers over decades, is to cut the light further: eleven hours, sometimes ten, particularly in the last weeks. It costs some yield yield and buys a earlier clearer finish. A listing which says “equatorial” is warning you this in one word, and a grower who reads it as mere geography misses the point inside it.
Landrace versus heirloom
A population of plants adapted over generations to a particular region by the local climate and growers alike, rather than by deliberate breeding. Colombian, Colombian, Malawian and Oaxacan stock are the sativa cases. A landrace is a spread, rather than a single plant: inside a pack the flowering times, finishing times and aromas spread widely than in any tent-bred line, and this variation is the whole value of keeping one.
The trap is treating a landrace as a finished hybrid. It brings traits that made sense in an open field, such as height that no tent can hold and a flowering clock tuned to a daylength the majority of growers never offer. “Heirloom” in a listing usually means a landrace that has been reproduced somewhere for some generations, typically with a degree of selection for tent conditions; it is nearer to usable but still far from a hybrid. A shop listing “landrace” without a collection region and a generation history is using the word as a flavour, and the seeds should be judged accordingly.
Intersex tendency
The production of male flowers on a female plant, typically late in flower and frequently under stress. Every cannabis line has some tendency for do; sativa plants show it more, for one simple one: fourteen weeks of flower is sixteen weeks of exposure for a light leak, a temperature spike or a late watering that can trigger it off, and a old that has already waited beyond its natural end often throws a few late male flowers on its own in a last attempt to make seed.
None of this means a sativa line unstable by course; it makes the grower’s discipline count over a longer stretch. A sealed room, stable conditions and harvesting the moment the plant is done and not a weeks later take away the greater part of the problem. A listing that mentions the breeder screens parents for hermaphrodite traits is worth worth hearing for a sativa than on any other category.