Sativa seeds come with more jargon attached than any other category of cannabis seed, and a good deal of it means a certain thing to a botanist, another to a seed company and a third to the grower trying to make a decision in front of the pack. The disappointing sativa grow usually traces back to a word that was read in the wrong sense: a flowering time taken as a promise, a “sativa-dominant” label read as a statement of character, a landrace chosen like it were a modern hybrid. The entries below were written with the range at https://hazesativaseeds.com to hand as the concrete examples, since it runs strongly towards the long-flowering end of the spectrum where the words carry the most weight most; the definitions themselves apply to any sativa seed from any seller. They are in no special order, because none of them is sense without the others.
Equatorial (the twelve-hour problem)
Describes plants out of regions where daylength barely changes through the year, which means that the plant never develop a strong reaction to changing days. These lines often start flowering reluctantly under a standard twelve-hour schedule, since twelve hours is, for them, an ordinary day and not a signal.
The working fix, passed around among sativa growers over decades, is to shorten the light further: eleven hours, sometimes ten, especially in the final weeks. It loses a yield yield and gains a earlier decisive end. A listing which says “equatorial” is telling you about this with one word, and a grower who takes it as a note on origin has missed the instruction inside it.
Stretch
The surge of vertical growth that follows the change to flowering. Indica-leaning plants gain half their height again; sativas routinely double, and some equatorial types go further. The stretch lasts three to five weeks and will not be stopped once it has started, only redirected by training.
In tent terms, a stretch figure is the number to reading ahead of deciding when to flip. A sativa flipped at sixty centimetres centimetres in a standard tent is at the lamp before week four of flower; one switched at thirty centimetres centimetres has room. Growers moving from indica stock almost always flip far too late the first time, and the lesson is visible on the ceiling of the tent.
Landrace
A population of plants shaped through centuries to a particular place by local climate and climate alike, and not by deliberate selection. Thai, Colombian, Malawian and Mexican stock are the classic sativa examples. A landrace is variable, rather than a single plant: inside a pack the flowering times, flowering times and aromas spread far more than a tent-bred hybrid, and that spread is the whole value of growing one.
The trap is treating a landrace as a modern product. It brings traits that make sense in an open field, including height that no tent can contain and a flowering rhythm set to a equatorial daylength most growers never provide. “Heirloom” on a listing generally means a landrace that has been reproduced somewhere over a number of generations, typically with light selection towards tent life; it is nearer to manageable but still far from uniform. A shop listing “landrace” without a collection region and a generation history is applying the word as a flavour, and the pack should be judged with that in mind.
Foxtailing
The habit of certain flowers to push out fresh calyx clusters on top of existing ones, giving towered, irregular buds rather than dense ones. In most indica-leaning strains it is a stress symptom, typically from light too close or a room too high, and the advice is to correct the room.
In a good number of sativas, above all Thai and certain Haze lines, it is genetic and will happen under a flawless room. A new sativa grower frequently wastes weeks chasing a problem that is there, dropping lights and heat and slowing a long plant even more. The breeder rarely says which kind you should expect; the parentage usually tells you.
Flowering time
The figure of weeks from the start of flowering and maturity, and the single most misread figure 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 period is a twenty-two-week plant. Seed companies additionally give the shorter end of a spread, since the other end moves fewer seed.
Long-flowering plants run everywhere from ten weeks to more than twenty, and the longest strain in the Haze Sativa Seeds range comes in at about 16 weeks after the flip. The catalogue can be sorted by that number, which is the reasonable first step for a room with a tight timetable. A grower who allows four weeks to whatever the pack says is seldom caught out.
Hermaphroditism in long-flowering lines
The production of pollen-bearing flowers on a female plant, usually towards the end in flower and frequently in response to stress. Every cannabis population has some capacity to do; long-flowering lines express it more, and the reason is a simple one: fourteen weeks of flower is sixteen weeks of opportunity for a timer leak, a temperature spike or a late watering to set it off, and an plant that has already waited past its natural end often throws a few desperate pollen flowers on its own as a last attempt to set seed.
Not one of these makes a sativa line unstable by course; it means the grower’s discipline count for longer. Light-tight room, steady temperatures and cutting the moment the plant is done rather than a week after take away most of the risk. A listing which mentions the breeder tests parents for hermaphrodite traits is worth worth hearing for a sativa than on anything else.
Haze
In its first sense a particular family of plants bred in 1970s California from Mexican, Colombian and South Indian landraces, and later kept and worked in the Netherlands. A true Haze grows tall, branches openly, takes for twelve sixteen weeks and smells of spice, pine and a note sharp that no other line exactly has.
In its second sense “Haze” is whatever cross which carries a share of that family, which today is most of the sativa-leaning market. A listing that says “Haze” without lineage could 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 not “is it a Haze” but “how much, and via which parent”.
Terpinolene (the “sativa smell”)
A aromatic compound found in high amounts in a lot of classic sativa lines and responsible for most of the thing people mean as the “sativa” smell: fresh, piney, lemon and slightly floral at once. It is fragile, lost quickly through hot drying, and terpinolene fades faster during storage than the heavier terpenes that lead indica-leaning lines.
For a seed buyer the name earns two jobs. When a listing lists terpinolene among the lead terpene, the line most likely has substantial Haze-era ancestry whatever the label claims. And where the grower wants that smell to survive to the jar, the drying has to be slow and slow; a warm drying room flattens a terpinolene sativa to a flower that tastes of very little and leaves no trace of what the pack described.
Sativa-dominant
A catalogue term and not a botanical one. It generally indicates that more of a hybrid’s lineage are classed as sativa by whoever drafted the listing, and sometimes signals 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, clear-headed instead of sedating, is driven far more by terpene chemistry and the THC content than it is by ancestry, and plenty of “sativa-dominant” hybrids produce a heavy sleepy effect and a good number of the opposite stock deliver exactly the opposite. To a buyer the percentage is worth something as a rough guide to growth habit, flowering time and stretch; as a guide to effect it is close to useless unless accompanied by the aroma description.