Sativa seeds arrive with more jargon around them than any other kind of cannabis seed, and most of it says a certain thing to a botanist, another to a breeder and a third to the person trying to make a decision in front of the pack. The disappointing sativa grow nearly always goes back to a word that was understood in the wrong sense: a flowering time taken as a promise, a “sativa-dominant” tag taken as a statement of character, a landrace chosen as if it were a tent-bred hybrid. The entries below were written with the range at https://hazesativaseeds.com to hand for reference, since it runs strongly to the classic end of the spectrum and that is where the vocabulary carry the most weight most; the definitions though hold to any sativa seed from any shop. They are in no particular order, because none of them makes usable on its own without the rest.
Latitude
The one figure that determines if a sativa can ripen outdoors, and one that no pack prints. Equatorial lines need a run of shortening days to continue long enough for the plant to ripen; in high latitudes the frost arrives before that, and the grower cuts a unripe plant in late October or else loses it rot in November. A further to the equator, within the northern hemisphere, the later the window stretches, and coastal or subtropical growers can ripen plants that temperate gardens never will.
The usable rule for a seed listing: an “outdoor” sativa finishing date is stated for the breeder’s home latitude, normally a point within temperate Europe or the western United States, and each step north of it moves the finish later into the frost. A grower north of roughly the fiftieth parallel that wants a true sativa outdoors is looking for a sativa autoflower or a covered space, and not a better season.
Sativa-dominant (the label)
A catalogue category and not a measurable one. It generally means that more of a hybrid’s parents are described as sativa according to whoever wrote the listing, which occasionally means nothing more than that the flowers are longer or the smell brighter than the same breeder’s indica-labelled releases.
The experience people associate with a word, clear-headed instead of heavy, is governed far more by terpene profile and the cannabinoid content than it is by ancestry, and a good number of “sativa-dominant” releases produce a heavy sleepy effect and plenty of indica-labelled stock deliver exactly the opposite. To a buyer 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 unless accompanied by the terpene description.
Flowering time
The figure of weeks between the onset of flowering and maturity, and the one most misread number on a sativa pack. With photoperiod seed it is counted from the day the light drops to twelve hours, rather than from germination, so a “fourteen-week” sativa started after a ordinary vegetative stage is a twenty-two-week plant. Seed companies also give the shorter end of the range, because the longer end moves less seed.
Sativa plants 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 from the flip. The catalogue can be filtered by this figure, which is the sensible first pass for a grower on a tight timetable. A grower who adds four weeks on top of whatever the pack says is seldom disappointed.
Haze (the family, not the smell)
Originally a particular family of plants bred in 1970s California from Mexican, Colombian and Thai parents, and then preserved and worked in the Netherlands. The Haze runs tall, fills out sparsely, takes for twelve to sixteen weeks and carries a scent of incense, pine and a note sharp that no line exactly has.
In its second sense “Haze” is any hybrid which contains a share of that family, and by now is a great many of the sativa-leaning market. A listing which says “Haze” without parents could be eighty percent the classic family or one sixteenth of it, and the flowering character follows the fraction, not the name. The working question is never “is it a Haze” but “how much, and through which parent”.
Hermaphroditism in long-flowering lines
The appearance of pollen-bearing flowers on a female plant, typically towards the end in flower and frequently in response to stress. Every cannabis population has a degree of capacity to it; long-flowering plants express it more often, and the reason is one simple reason: sixteen weeks of flower is fourteen weeks of opportunity for a timer leak, a temperature spike or a late watering that can trigger it going, and an old plant has waited past its natural end often throws a few late pollen flowers on its own in a final effort to set seed.
None of these makes a sativa strain weak as a matter of course; it means the grower’s discipline matter for a longer stretch. A sealed room, steady conditions and cutting when the plant is done and not two weeks later remove most of the problem. A listing that mentions a breeder screens parents for intersex traits is saying something more for a sativa than for anything other category.
Stretch
The surge of upward growth that follows the change to flowering. Most tent-bred plants gain half again; sativas routinely double, and a few landrace types triple. The stretch lasts two to five weeks and cannot be halted once it begins, merely bent sideways by training.
In practical terms, the stretch figure is a number worth reading ahead of choosing when to flip. A sativa switched at sixty centimetres centimetres in a two-metre tent is touching the lamp before week four of flower; one flipped at thirty centimetres centimetres has room. Growers moving over from indica stock nearly always flip far 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 certain flowers to grow fresh bud clusters on top of existing ones, producing spired, irregular buds instead of dense ones. In the majority of tent-bred strains it is a heat response, typically caused by light that is too close or a room that is too high, and the standard response is to fix the room.
In many sativas, especially Southeast Asian and certain Haze lines, it is built in and will happen under a perfect room. A first-time sativa grower frequently spends a month hunting a problem that was never there, lowering lights and heat and slowing a long plant even more. The listing rarely warns which type you should expect; the parentage usually tells you.
Landrace
A population of plants adapted over centuries to one region by local growers and growers together, rather than by modern breeding. Thai, Colombian, Malawian and Oaxacan lines are the sativa cases. A landrace is variable, rather than a one plant: inside a pack the flowering times, finishing times and smells range far more than in any tent-bred hybrid, and that spread is the point of keeping one.
The trap is treating a landrace as a modern product. It carries traits that made sense in an open field, including a frame no tent can hold and a flowering rhythm set to an daylength the majority of growers never offer. “Heirloom” in a listing usually refers to a landrace that has been reproduced away from its origin for a number of generations, typically with a degree of selection for tent conditions; it is closer to manageable but nonetheless far from uniform. A shop offering “landrace” that does not give a collection region and a reproduction history is using the word loosely, and the seeds should be priced with that in mind.
Terpinolene (the “sativa smell”)
A terpene found in high amounts in a lot of old sativa lines and accounting for much of what growers describe as the “sativa” aroma: fresh, woody, citrus and faintly sweet at once. It is fragile, lost easily through hot drying, and terpinolene degrades more quickly in the cure than the heavier terpenes that dominate most tent stock.
To a seed buyer the word earns two things. Where a listing names terpinolene as the leading aromas, the line most likely has substantial old-sativa genetics regardless of what the label says. And where the you are after that profile to survive to the jar, the cure is going to be slow and cool; a fast drying room flattens a terpinolene line to a flower that tastes of very little and nothing of what the pack described.