Sativa seeds arrive with more vocabulary attached than any other kind of cannabis seed, and a good deal of it means one thing to a botanist, something else to a breeder and something different again to the grower trying to make a decision in front of the pack. A failed sativa grow nearly always traces back to a word that was read in the wrong one of those senses: a flowering time read as a fixed number, a “sativa-dominant” label taken as a description of character, a landrace bought like it were a modern hybrid. The entries below were written with the range at https://hazesativaseeds.com to hand as reference, because it runs heavily towards the long-flowering end of the category and that is where the words carry the most weight most; the meanings themselves apply to any sativa seed from any seller. They are given in no particular order, since none of them makes sense on its own without the others.
Flowering time
The number of weeks between the onset of flowering and harvest, which is the single most misread number on a sativa pack. With photoperiod seed it is counted from the day the light is cut to twelve hours, not from germination, so a “fourteen-week” sativa started after a eight-week vegetative period is a twenty-two-week plant. Seed companies also give the shorter end of the spread, since the other end sells fewer seed.
Sativa lines take anywhere from ten weeks to well over twenty, and the slowest strain in the Haze Sativa Seeds range comes in at about 16 weeks after the flip. The catalogue can be sorted by that figure, which is a reasonable first pass for a room with a fixed timetable. A grower who adds four weeks to the figure the pack states is seldom disappointed.
Stretch (the doubling)
The burst of upward growth which comes after the switch to flowering. Most tent-bred plants gain around half their height again; sativas commonly double, and a few landrace lines triple. The stretch lasts two to four weeks and cannot be stopped after it begins, merely bent sideways by training.
In tent terms, the stretch figure is a fact to reading before deciding when to switch. A sativa flipped at sixty centimetres in a two-metre tent is at the lamp before week four of flower; one switched at thirty centimetres has room. Growers coming over from indica strains almost always switch too late the first time, and the consequence is visible on the ceiling of the tent.
Landrace versus heirloom
A population of plants shaped through centuries to one region by local growers and climate together, and not by modern breeding. Colombian, Colombian, Congolese and Mexican lines are the classic sativa cases. A landrace is a spread, not a one plant: within a pack the heights, finishing times and smells spread far more than any tent-bred line, and this spread is the whole value of keeping one.
The trap is buying a landrace like a modern product. It carries habits that made sense in an equatorial field, including a frame that no tent can hold and a flowering clock set to a daylength the majority of growers never offer. “Heirloom” on a listing generally refers to a landrace that has been grown out somewhere over a number of generations, typically with a degree of selection for tent life; it is closer to manageable but still not uniform. A seller listing “landrace” without an origin point and a reproduction count is applying the word as a flavour, and the pack should be judged with that in mind.
Sativa-dominant (the label)
The marketing term and not a measurable one. It usually means that the larger share of a hybrid’s lineage are described as sativa by whoever drafted the description, which sometimes means no more than that the flowers are longer or the aroma sharper than the same breeder’s indica-labelled lines.
The effect people connect with a word, clear-headed instead of sedating, is governed far more by terpene chemistry and the cannabinoid content than by ancestry, and a good number of “sativa-dominant” releases deliver a heavy couch result and plenty of the opposite stock deliver the reverse. To a buyer the percentage is worth something for a loose guide to growth habit, flowering time and stretch; for a guide to effect it is close to worthless unless accompanied by the terpene notes.
Intersex tendency
The production of pollen-bearing flowers on a female plant, typically towards the end in flower and often under stress. Every cannabis population has a degree of capacity for it; long-flowering plants show it more, for one simple reason: fourteen weeks of flower is sixteen weeks of exposure for a timer leak, a temperature spike or a missed watering to set it going, and an plant plant has already gone beyond its natural finish often throws a few late pollen sacs on its own in a last attempt to set seed.
Not one of this makes a sativa line weak as a matter of nature; it means the grower’s consistency count over longer. Light-tight room, steady conditions and cutting the moment the plant is ready and not two weeks later remove most of the problem. A listing that states a breeder tests parents for intersex tendency is worth more on a long-flowering line than on anything else.
Latitude (outdoor sativas)
The single number that determines if a sativa can ripen outdoors, and one no pack prints. Long-flowering lines need the autumn days to continue late enough to let the plant to ripen; at high latitudes the frost comes first, and the grower cuts an unripe plant in late October or else watches it to mould in November. The closer to the equator, within a northern hemisphere, the longer the season runs, and Mediterranean and subtropical gardens can finish plants that temperate gardens cannot.
The usable reading for a seed pack: an “outdoor” sativa finishing date is stated for the breeder’s home latitude, usually a point in temperate Europe or the west coast of the United States, and every degree north of it pushes the finish later towards the frost. A grower north of about the fiftieth parallel that wants a long-flowering sativa in the garden needs to be shopping for an autoflower or else a covered space, and not a better season.
Foxtailing (and when it is not a fault)
The tendency of some flowers to push out new bud growth on top of old ones, giving towered, open buds instead of round ones. In most indica-leaning lines it is a stress response, usually caused by light that is too close or a room that is too high, and the standard response is to fix the cause.
In many sativas, especially Southeast Asian and some Haze lines, it is built in and will occur under a perfect room. A first-time sativa grower often spends weeks hunting a problem that was never a problem, dropping lights and temperatures only slowing a slow plant further. The breeder rarely warns which kind to expect; the lineage usually does.
Haze
Originally a specific line of plants put together in coastal California from Mexican, Thai and South Indian landraces, and then preserved and worked in the Netherlands. The Haze runs tall, fills out sparsely, flowers for twelve to to sixteen weeks and smells of spice, citrus and something sharp that no other other line quite has.
In its looser sense “Haze” is whatever hybrid that carries some of that family, which by now is a great many of the sativa-leaning catalogue. A listing which says “Haze” without lineage could be eighty percent the old family or a small fraction of it, and the flowering character tracks the fraction, not the name. The useful question is not “is it a Haze” but “how much, and via which parent”.
Equatorial
Describes lines from regions where daylength barely changes across the year, which means that the plant does not evolved a strong reaction to shortening days. These plants frequently flower reluctantly at a standard twelve-hour light cycle, because twelve hours is, to them, a mild unremarkable day and not a signal.
The practical fix, handed down between sativa growers over decades, is to shorten the light more: eleven hours, occasionally ten, particularly during the final weeks. It costs a little yield and gains an earlier decisive end. A listing that says “equatorial” is warning you about this in one word, and a grower who reads it as a note on origin misses the point hidden in it.
Terpinolene
A aromatic compound present in large amounts in a lot of old sativa lines and accounting for much of the thing people describe as the “sativa” smell: fresh, piney, citrus and faintly sweet at once. It is volatile, lost quickly through hot drying, and it degrades faster during the cure than the heavier terpenes which lead most tent stock.
For a seed buyer the name earns two jobs. When a listing lists terpinolene as the lead terpene, the strain probably carries substantial old-sativa genetics whatever the percentage claims. And where the grower wants that profile to survive to the jar, the cure is going to be slow and cool; a fast dry turns a terpinolene line into something that tastes of very little and leaves no trace of what the pack described.