Sativa seeds arrive with more vocabulary around them than any other kind of cannabis seed, and most of it says one thing to a botanist, another to a breeder and something different again to the grower trying to make a decision in front of the listing. A failed sativa grow nearly always goes back to a word that was understood in the wrong sense: a flowering time read as a promise, a “sativa-dominant” tag taken as a description of effect, a landrace chosen as if it were a modern hybrid. The entries below were written with the range at https://hazesativaseeds.com to hand as the concrete examples, because it runs strongly towards the long-flowering end of the category and that is where the words carry the most weight most; the definitions though hold to any sativa seed from any seller. They are in no special order, because not one of them makes usable without the others.
Latitude
The single number that determines whether a sativa can finish outdoors, and one no pack states. Equatorial lines need the run of shortening days to continue late enough for the plant finish; at northern latitudes the frost comes first, and the grower harvests an half-finished plant in late October or else loses it rot in November. A closer south, within the northern hemisphere, the longer the season stretches, and Mediterranean or subtropical gardens are able to finish lines that northern gardens never will.
The usable rule for a seed listing: an “outdoor” sativa finishing date is given for the breeder’s home latitude, usually a point in temperate Europe or the west coast of the United States, and each degree north of it pushes the finish back into the weather. A grower north of roughly the fiftieth parallel who is after a true sativa outdoors needs to be shopping for a sativa autoflower or a greenhouse, not a longer summer.
Intersex tendency
The production of male flowers on a female plant, usually towards the end in flower and often in response to stress. Every cannabis line carries a degree of tendency for it; long-flowering plants express it more, and the reason is one simple reason: fourteen weeks of flower is fourteen weeks of opportunity for a light leak, a temperature spike or a late watering to trigger it off, and a plant that has already waited beyond its intended finish often produces a few desperate pollen flowers on its own as a final effort to make seed.
None of these makes a sativa line unstable by course; it means the grower’s consistency matter over a longer stretch. Light-tight tents, stable conditions and harvesting when the plant is ready rather than two weeks later take away the greater part of the problem. A listing which mentions the breeder screens parents for intersex traits is saying something worth hearing for a long-flowering line than for any other category.
Terpinolene
A aromatic compound found in high proportion in many old sativa strains and responsible for most of the thing growers mean as a “sativa” smell: fresh, piney, citrus and slightly floral at once. It is fragile, driven off easily through fast drying, and terpinolene fades faster during the cure than the heavier terpenes that dominate most tent stock.
For a seed buyer the name earns two jobs. When a listing names terpinolene as the lead terpene, the line probably has real old-sativa ancestry regardless of what the percentage claims. And when the you are after that smell to survive by the jar, the cure is going to be cool and cool; a warm drying room turns a terpinolene line into a flower that tastes of hay and nothing of what the pack promised.
Foxtailing
The tendency of certain flowers to push out fresh bud growth on top of old ones, producing spired, irregular buds rather than dense ones. In the majority of tent-bred strains it is a stress symptom, typically caused by light that is too close or a room that is too high, and the advice is to fix the room.
In many sativas, especially Southeast Asian and certain Haze hybrids, it is built in and will happen in a perfect room. A new sativa grower frequently spends a month hunting a problem that was never there, dropping lights and temperatures and delaying a slow flower even more. The listing rarely says which kind to expect; the parentage generally tells you.
Landrace
A population of plants adapted through centuries to one region by local climate and climate together, rather than by deliberate selection. Colombian, Colombian, Congolese and Oaxacan lines are the sativa examples. A landrace is a spread, rather than a one plant: within a pack the heights, flowering times and smells spread widely than any tent-bred hybrid, and this spread is the whole value of growing one.
The trap is treating a landrace as a finished hybrid. It brings traits that make sense in an equatorial field, such as a frame that no tent can hold and a flowering clock set to a daylength most growers never offer. “Heirloom” in a listing generally means a landrace that has been grown out away from its origin for some generations, often with light selection towards tent life; it is closer to manageable but nonetheless not uniform. A seller listing “landrace” without a origin point and a reproduction count is using the word as a flavour, and the seeds should be judged with that in mind.
Sativa-dominant (the label)
A catalogue category rather than a botanical one. It usually indicates that the larger share of a hybrid’s parents were classed as sativa according to whoever wrote the listing, and occasionally signals no more than that the buds are longer or the smell brighter than the that breeder’s other releases.
The experience people connect with the word, clear-headed instead of sedating, is governed more by terpene chemistry and the cannabinoid content than it is by the sativa fraction, and plenty of “sativa-dominant” releases deliver a heavy couch result while plenty of the opposite lines do exactly the opposite. To a grower the percentage 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 unless accompanied by the aroma description.
Stretch (the doubling)
The burst of vertical growth that comes after the change to flowering. Most tent-bred plants add around half their height again; sativas routinely double, and a few landrace lines go further. The stretch continues three to five weeks and cannot be halted once it begins, only redirected by training.
In tent terms, a stretch figure is a number worth read ahead of deciding when to flip. A sativa switched at sixty centimetres in a standard tent is at the lamp before week four of flower; one switched at thirty centimetres centimetres has room. People moving from indica stock nearly always flip far too late the first time, and the lesson is written on the ceiling of the tent.
Equatorial (the twelve-hour problem)
Refers to plants out of latitudes in which daylength hardly changes through the year, which means where the plant never evolved a strong reaction to changing days. These plants frequently flower reluctantly at a standard twelve-hour light cycle, since twelve hours is, for them, a mild unremarkable day and not a signal.
The working response, passed down between sativa growers for decades, is to shorten the light further: eleven hours, occasionally ten, especially during the last weeks. It loses a little yield and buys a earlier clearer end. A listing that says “equatorial” is warning you this with one word, and a grower that reads it as a note on geography has missed the instruction inside it.
Haze (the family, not the smell)
Originally a particular line of plants put together in coastal California from Colombian, Thai and South Indian parents, and later preserved and refined in the Netherlands. The Haze grows tall, branches sparsely, flowers for twelve to to sixteen weeks and carries a scent of incense, pine and a note sharp that no other line exactly has.
In its looser sense “Haze” is whatever cross which carries some of that family, which by now is a great many of the sativa-leaning catalogue. A listing that reads “Haze” without parents may be eighty percent the old family or a small fraction of it, and the grow character tracks the fraction, not the name. The useful question is never “is it a Haze” but “how much, and via which parent”.
Flowering time
The number of weeks between the onset of flowering and maturity, which is the single most misunderstood figure on a sativa pack. With photoperiod seed it is measured from the day the light drops to twelve hours, rather than from sowing, so a “fourteen-week” sativa started after an eight-week vegetative stage is a five-month plant. Breeders also quote the shorter end of the spread, because the longer end sells less seed.
Sativa plants take anywhere from ten weeks to more than twenty, and the longest line in the Haze Sativa Seeds range is at around 16 weeks after the flip. The catalogue can be filtered by this figure, which is the reasonable first pass for a room on a tight schedule. A grower who allows four weeks to the figure the pack says is rarely caught out.