Sativa seeds come with more jargon around them than any other category of cannabis seed, and a good deal of it means one thing to a botanist, another to a seed company and something different again to the person trying to make a decision in front of the listing. The failed sativa grow nearly always goes back to a word that was understood in the wrong one of those senses: a flowering time read as a fixed number, a “sativa-dominant” tag read as a statement of effect, a landrace bought like it were a modern hybrid. The entries below were put together with the range at https://hazesativaseeds.com to hand for reference, since it leans strongly to the classic end of the category where the words carry the most weight most; the definitions themselves hold to any sativa seed from any seller. They are in no particular order, since not one of them makes usable on its own without the rest.
Hermaphroditism in long-flowering lines
The production of male flowers on a female plant, usually towards the end in flower and often under stress. Every cannabis population has a degree of tendency for it; long-flowering plants express it more often, for a simple one: sixteen weeks of flower is sixteen weeks of opportunity for a timer leak, a heat spike or a late watering that can set it off, and a plant that has already gone past its natural end frequently throws a few late pollen flowers on its own as a last effort to set seed.
None of this means a sativa line unstable by nature; it means the room’s discipline count over longer. Light-tight tents, steady temperatures and cutting when the plant is done and not a weeks after remove most of the risk. A listing that mentions the breeder tests parents for hermaphrodite traits is worth worth hearing for a sativa than on anything other category.
Landrace
A population of plants shaped through centuries to a particular place by local growers and climate alike, and not by deliberate selection. Colombian, Thai, Congolese and Mexican lines are the sativa examples. A landrace is a spread, rather than a one plant: within a pack the flowering times, flowering times and smells range widely than in any tent-bred line, and that variation is the point of keeping one.
The trap is treating a landrace like a finished hybrid. It carries habits that made sense in an open field, such as height that no tent can contain and a flowering clock tuned to a daylength the majority of growers never offer. “Heirloom” in a listing generally means a landrace that has been grown out somewhere for a number of generations, often with a degree of selection for tent conditions; it is nearer to usable but still far from a hybrid. A seller listing “landrace” that does not give a collection region and a generation count is applying the word loosely, and the seeds should be priced accordingly.
Flowering time (and what it is counted from)
The figure of weeks from the start of flowering and maturity, and the single most misunderstood number on a sativa pack. With photoperiod seed it is counted from the day the light is cut to twelve hours, not from sowing, so a “fourteen-week” sativa grown after an eight-week vegetative stage is a five-month plant. Seed companies also give the shorter end of the spread, because the other end moves less seed.
Sativa plants take everywhere from ten weeks to well over twenty, and the longest line in the Haze Sativa Seeds range comes in at about 16 weeks from the flip. The catalogue can be filtered by that figure, which is the reasonable first step for a grower on a fixed timetable. A grower who adds four weeks to the figure the pack states is rarely disappointed.
Haze (the family, not the smell)
Originally a particular line of plants bred in 1970s California from Mexican, Thai and South Indian parents, and later preserved and refined in the Netherlands. A true Haze runs tall, fills out sparsely, flowers for twelve to to sixteen weeks and carries a scent of spice, citrus and something sharp that no other line quite has.
In its looser sense “Haze” is whatever hybrid that contains a share of that family, which today is most of the sativa-leaning catalogue. A listing that says “Haze” without lineage could be eighty percent the old family or one sixteenth of it, and the flowering character tracks the share, not the name. The useful question is not “is it a Haze” but “how much, and via which parent”.
Equatorial
Describes plants from latitudes in which daylength hardly varies across the year, and where the plant never develop a strong response to changing days. These lines often flower slowly under a standard twelve-hour schedule, since twelve hours is, for them, a mild unremarkable day rather than a signal.
The practical fix, handed down among sativa growers for decades, is to cut the light more: eleven hours, occasionally ten, especially during the final weeks. It loses a little yield and gains a earlier decisive end. A listing that says “equatorial” is telling you about this in one word, and a grower that reads it as mere geography has missed the instruction inside it.
Foxtailing (and when it is not a fault)
The habit of certain flowers to push out new calyx growth on top of old ones, producing spired, irregular buds instead of round ones. In the majority of tent-bred strains it is a stress response, typically from light too close or a room too high, and the standard response is to fix the room.
In many sativas, above all Southeast Asian and some Haze lines, it is built in and will happen in a flawless room. A new sativa grower often spends a month chasing a fault that was never not a problem, lowering lights and temperatures and delaying an already long plant further. The breeder rarely says which type you should expect; the parentage generally tells you.
Sativa-dominant
A catalogue term and not a botanical one. It usually means that the larger share of a hybrid’s parents are classed as sativa by the breeder who drafted the listing, which sometimes signals nothing more than that the buds are airier or the aroma brighter than the that breeder’s indica-labelled releases.
The effect people associate with the word, lively rather than sedating, is governed more by terpene chemistry and by THC balance than it is by ancestry, and a good number of “sativa-dominant” hybrids deliver a heavy sleepy result while plenty of the opposite stock deliver exactly the opposite. For a buyer the label is worth something for a rough guide to growth habit, flowering time and stretch; for a predictor to effect it is close to worthless unless accompanied by the aroma notes.
Latitude (outdoor sativas)
The single figure that decides if a sativa can finish outdoors, and one that no pack prints. Long-flowering lines need the run of shortening days to go on long enough to let the plant finish; at northern latitudes the frost arrives before that, and the grower cuts an unripe plant in late October or else watches it rot in November. A closer to the equator, within the northern hemisphere, the longer the season runs, and Mediterranean and subtropical growers can finish lines that temperate growers cannot.
The usable rule for a seed pack: an “outdoor” line harvest date is given for the breeder’s home latitude, normally a point within southern Europe or the west coast of the United States, and every step north of it moves the finish later into the weather. A grower above roughly the fiftieth parallel who wants a long-flowering sativa outdoors is looking for a sativa autoflower or else a greenhouse, not a better summer.
Stretch
The burst of upward growth which follows the change to flowering. Most tent-bred plants add around half again; sativas commonly double, and some landrace types triple. The stretch lasts two to five weeks and cannot be stopped after it begins, merely redirected by training.
In practical terms, the stretch multiplier is a number to read ahead of deciding when to switch. A sativa flipped at sixty centimetres centimetres inside a two-metre tent is touching the lamp before week four of flower; one flipped at thirty centimetres centimetres has room. People coming from indica stock nearly always flip too late the first time, and the consequence is written on the ceiling of the tent.