Sativa seeds come with more vocabulary around them than any other category of cannabis seed, and most of it says 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. A disappointing sativa grow usually traces back to a word that was understood in the wrong sense: a flowering time taken as a fixed number, a “sativa-dominant” tag read as a description of character, a landrace bought 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, since it runs strongly towards the classic end of the category where the words matter most; the definitions though apply to any sativa seed from any shop. They are in no particular order, since not one of them is sense without the others.
Flowering time (and what it is counted from)
The figure of weeks between the start of flowering and maturity, which is the one most frequently misunderstood number 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 with an ordinary vegetative stage is a twenty-two-week plant. Seed companies additionally quote the optimistic end of the spread, because the other end sells fewer seed.
Long-flowering plants take anywhere from ten weeks to more than twenty, and the longest strain in the Haze Sativa Seeds range comes in at around 16 weeks after the switch. The catalogue can be sorted by this number, which is the sensible first pass for a grower with a tight timetable. A grower who adds four weeks on top of whatever the pack says is seldom caught out.
Foxtailing
The habit of some flowers to grow new calyx growth on top of existing ones, producing spired, open buds rather than round ones. In the majority of indica-leaning strains it is a stress response, usually from light that is too close or a room too high, and the standard response is to correct the cause.
In many sativas, especially Thai and certain Haze lines, it is built in and is going to happen under a flawless room. A first-time sativa grower often spends weeks chasing a fault that is not a problem, lowering lights and temperatures and delaying an already slow plant further. The listing seldom says which type to expect; the parentage generally does.
Equatorial (the twelve-hour problem)
Refers to lines out of regions where daylength barely changes across the year, which means that the plant does not develop a strong response to changing days. These lines often flower slowly at a conventional twelve-hour light cycle, because twelve hours is, to them, an unremarkable day and not a signal.
The working response, handed down between sativa growers over decades, is to shorten the light further: eleven hours, sometimes ten, especially during the last weeks. It costs some yield yield and buys an earlier clearer end. A listing that uses “equatorial” is warning you about this with one word, and a grower who reads it as a note on geography misses the instruction inside it.
Terpinolene (the “sativa smell”)
A terpene found in large proportion in a lot of classic sativa strains and accounting for most of the thing people describe as the “sativa” aroma: green, woody, citrus and faintly sweet at once. It is volatile, driven off quickly by hot drying, and terpinolene fades faster during the cure than the earthier terpenes that lead indica-leaning lines.
For a seed buyer the word does two things. When a listing names terpinolene as the leading aromas, the strain most likely has substantial old-sativa genetics whatever the percentage claims. And where the you are after that smell to still be there to the jar, the drying is going to be slow and cool; a warm dry flattens a terpinolene line into a flower that tastes of hay and leaves no trace of what the pack promised.
Haze (the family, not the smell)
Originally a specific family of plants put together in 1970s California from Mexican, Colombian and South Indian landraces, and then kept and refined in the Netherlands. A true Haze grows tall, branches sparsely, takes for twelve to to sixteen weeks and carries a scent of incense, pine and something sharp that no other line quite has.
In its looser sense “Haze” is whatever hybrid that carries a share of that family, and by now is a great many of the sativa-leaning market. A listing which reads “Haze” without lineage may be mostly percent original classic family or one sixteenth of it, and the grow character follows the fraction, not the name. The working question is not “is it a Haze” but “how much, and through which parent”.
Stretch (the doubling)
The surge of upward growth that follows the change to flowering. Indica-leaning plants gain around half again; sativas commonly double, and some landrace types triple. The stretch lasts three to five weeks and will not be halted after it begins, merely bent sideways by training.
In practical terms, a stretch figure is the number to read ahead of deciding when to switch. A sativa flipped at sixty centimetres centimetres inside a two-metre tent is at the lamp before week four of flower; one flipped at thirty centimetres has room. People coming over from indica strains almost always flip too late the first time, and the lesson is written on the ceiling of the tent.
Landrace versus heirloom
A population of plants shaped over centuries to a particular region by the local growers and growers together, rather than by deliberate selection. Colombian, Thai, Malawian and Mexican stock are the sativa examples. A landrace is a spread, not a single plant: inside a pack the heights, finishing times and aromas spread widely than any tent-bred hybrid, and this spread is the point of growing one.
The mistake is treating a landrace like a modern hybrid. It brings traits that made sense in an open field, including a frame no tent can hold and a flowering clock set to a daylength most growers cannot provide. “Heirloom” on a listing usually means a landrace that has been grown out away from its origin for some generations, typically with a degree of selection towards indoor life; it is closer to usable but still far from a hybrid. A seller listing “landrace” that does not give a origin region and a generation history is using the word loosely, and the pack should be judged accordingly.
Sativa-dominant (the label)
A catalogue category and not a botanical one. It generally indicates that more of a hybrid’s lineage were classed as sativa according to the breeder who wrote the description, which sometimes signals no more than a certain the buds are longer or the aroma brighter than the that breeder’s indica-labelled releases.
The experience people associate with a word, lively instead of heavy, is governed far more by terpene profile and the THC balance than it is by the sativa fraction, and a good number of “sativa-dominant” releases produce a heavy couch result and plenty of indica-labelled stock deliver exactly the opposite. For 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 worthless without the aroma notes.
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 population has some tendency for do; long-flowering lines show it more, and the reason is one simple reason: sixteen weeks of flower is fourteen weeks of exposure for a light leak, a heat spike or a missed watering that can trigger it off, and a old that has already gone past its intended end often produces a few late male flowers on its own as a final effort to set seed.
Not one of this means a sativa strain weak as a matter of course; it means the room’s discipline count over longer. A sealed tents, stable temperatures and cutting the moment the plant is done rather than a week later take away most of the problem. A listing that states a breeder screens parents for intersex traits is worth worth hearing on a long-flowering line than for anything other category.