Sativa seeds come with more vocabulary attached than any other kind of cannabis seed, and a good deal of it means 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. A disappointing sativa grow nearly always goes 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 effect, a landrace bought as if it were a modern hybrid. The entries below were written with the range at https://hazesativaseeds.com to hand for reference, since it leans strongly towards the long-flowering end of the category and that is where the vocabulary matter most; the meanings though hold to any sativa seed from any seller. They are given in no particular order, since none of them makes usable without the others.
Latitude (outdoor sativas)
The single figure that decides whether a sativa will ripen outdoors, and a number no pack prints. Equatorial plants require the run of shortening days to go on late enough for the plant finish; at high latitudes the frost arrives first, and the grower harvests a unripe plant in the end of October or loses it to mould in November. The further south, in a northern hemisphere, the later the window runs, and Mediterranean and subtropical gardens can ripen lines that temperate gardens never will.
The practical rule for a seed listing: an “outdoor” sativa finishing date is stated for the breeder’s own latitude, usually somewhere in southern Europe or the western United States, and each degree north of it moves the date back towards the frost. A grower north of roughly the fiftieth parallel who wants a long-flowering sativa outdoors needs to be shopping for an autoflower or else a greenhouse, not a longer summer.
Landrace versus heirloom
A population of plants adapted over centuries to a particular region by the local growers and growers together, rather than by modern breeding. Thai, Colombian, Malawian and Mexican lines are the classic sativa examples. A landrace is variable, rather than a one plant: inside a pack the flowering times, finishing times and smells spread far more than a tent-bred hybrid, and that variation is the whole value of keeping one.
The mistake is buying a landrace like a finished product. It carries habits that make sense in an equatorial field, such as height that no tent can contain and a flowering clock tuned to an equatorial daylength the majority of growers never offer. “Heirloom” in a listing generally refers to a landrace that has been grown out away from its origin for some generations, typically with light selection towards tent conditions; it is closer to usable but nonetheless not uniform. A seller offering “landrace” without an collection point and a reproduction history is using the word loosely, and the seeds should be judged accordingly.
Foxtailing (and when it is not a fault)
The habit of some flowers to grow new bud clusters on top of old ones, producing spired, irregular buds rather than dense ones. In most indica-leaning strains it is a stress symptom, usually from light that is too close or a room that is too high, and the advice is to fix the cause.
In a good number of sativas, especially Southeast Asian and certain Haze lines, it is built in and is going to occur in a flawless room. A first-time sativa grower frequently wastes weeks chasing a fault that was never a problem, lowering lights and heat and slowing an already slow plant further. The breeder seldom warns which kind to expect; the parentage generally tells you.
Equatorial (the twelve-hour problem)
Describes lines from latitudes where daylength hardly varies across the year, which means that the plant never develop a sharp response to changing days. These lines frequently flower reluctantly at a standard twelve-hour schedule, since twelve hours is, for them, an unremarkable day and not a signal.
The working fix, passed around among sativa growers for decades, is to shorten the light further: eleven hours, sometimes ten, particularly in the last weeks. It costs a little yield and buys a earlier decisive finish. A listing which uses “equatorial” is warning you this in one word, and a grower who takes it as a note on origin misses the point hidden in it.
Flowering time (and what it is counted from)
The number of weeks between the onset of flowering and maturity, and the one most frequently misunderstood number on a sativa pack. For photoperiod seed it is counted from the day the light drops to twelve hours, not from germination, so a “fourteen-week” sativa grown after a ordinary vegetative stage is a twenty-two-week plant. Breeders additionally give the shorter end of a spread, because the longer end sells fewer seed.
Long-flowering plants take anywhere from ten weeks to well over twenty, and the longest strain in the Haze Sativa Seeds range comes in at about 16 weeks after the switch. The catalogue can be filtered by this figure, which is the sensible first pass if you have a room with a fixed timetable. A grower who allows four weeks to the figure the pack states is seldom disappointed.
Sativa-dominant
The catalogue term and not a botanical one. The phrase usually means that the larger share of a hybrid’s lineage were classed as sativa by the breeder who wrote the listing, which occasionally means no 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, lively rather than sedating, is governed more by terpene profile and the THC content than it is by ancestry, and plenty of “sativa-dominant” hybrids produce a flat sleepy result while plenty of indica-labelled lines deliver exactly the reverse. To a grower the percentage is useful for a rough guide to growth habit, flowering time and stretch; for a guide to effect it is close to useless unless accompanied by the terpene notes.
Haze
Originally a specific line of plants bred in coastal California from Mexican, Thai and South Indian landraces, and then preserved and refined in the Netherlands. The Haze runs tall, fills out openly, takes for twelve to sixteen weeks and carries a scent of incense, citrus and something metallic that no other line exactly reproduces.
In its second sense “Haze” is any cross which carries some of that family, which today is a great many of the sativa-leaning market. A listing which says “Haze” without lineage could be mostly percent original classic family or a sixteenth of it, and the flowering character follows the fraction, not the name. The useful question is never “is it a Haze” but “how much, and via which parent”.
Intersex tendency
The appearance of pollen-bearing flowers on a female plant, typically towards the end in flower and often in response to stress. Almost every cannabis population has a degree of tendency for it; sativa lines express it more, and the reason is a plain one: fourteen weeks of flower is fourteen weeks of exposure for a light leak, a heat spike or a missed watering that can set it going, and an plant plant has already gone beyond its natural finish often produces a few late male flowers on its own as a final effort to set seed.
Not one of these means a sativa line unstable as a matter of course; it makes the grower’s consistency matter over longer. Light-tight tents, stable conditions and cutting when the plant is ready and not two 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 on a long-flowering line than for anything else.
Stretch
The burst of vertical growth that follows the change to flowering. Indica-leaning plants add half again; sativas routinely double, and some landrace lines triple. The stretch lasts three to five weeks and will not be halted once it begins, only bent sideways by training.
In practical terms, the stretch figure is the number worth reading before deciding when to switch. A sativa flipped at sixty centimetres in a standard tent is at the lamp before week four of flower; one switched at thirty centimetres has room. People coming from indica stock almost always flip far too late the first time, and the consequence is written on the ceiling of the tent.