Sativa seeds arrive with more jargon around them than any other kind of cannabis seed, and a good deal of it means a certain thing to a botanist, another to a seed company and something different again to the person standing in front of the listing. The failed sativa grow nearly always traces back to a word that was understood 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 tent-bred hybrid. The entries below are written with the range at https://hazesativaseeds.com open as reference, because it leans strongly towards the long-flowering end of the spectrum and that is where the vocabulary carry the most weight most; the meanings themselves hold to any sativa seed from any seller. They are given in no particular order, because not one of them makes usable without the others.
Landrace
A population of plants adapted through generations to one region by the local climate and climate together, rather than by modern selection. Thai, Thai, Malawian and Oaxacan stock are the sativa examples. A landrace is a spread, not a single plant: within a pack the flowering times, flowering times and aromas spread far more than in any tent-bred hybrid, and that spread is the point of growing one.
The mistake is treating a landrace like a modern product. It brings traits that made sense in an equatorial field, such as height no tent can hold and a flowering clock tuned to a equatorial daylength most growers cannot provide. “Heirloom” on a listing generally means a landrace that has been reproduced somewhere for a number of generations, often with light selection towards tent life; it is closer to usable but nonetheless far from a hybrid. A shop listing “landrace” that does not give a collection point and a generation history is applying the word as a flavour, and the seeds should be priced accordingly.
Flowering time (and what it is counted from)
The number of weeks from the start of flowering and harvest, which is the one most misread figure on a sativa pack. For 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 eight-week vegetative stage is a twenty-two-week plant. Seed companies additionally quote the shorter end of a spread, because the longer end sells fewer seed.
Long-flowering plants run anywhere from ten weeks to well over twenty, and the longest strain in the Haze Sativa Seeds range comes in at around 16 weeks from the flip. The catalogue can be filtered by that figure, which is the sensible first step for a room on a tight schedule. A grower who adds four weeks on top of the figure the pack says is seldom caught out.
Stretch (the doubling)
The surge of vertical growth which comes after the switch to flowering. Indica-leaning plants gain around half their height again; sativas commonly double, and a few equatorial types triple. The stretch lasts three to five weeks and cannot be halted after it has started, merely bent sideways by training.
In practical terms, the stretch multiplier is a fact worth reading before choosing when to switch. A sativa switched at sixty centimetres centimetres in a standard tent is at the lamp by week four of flower; one switched at thirty centimetres has room. People coming from indica stock almost always switch far too late the first time, and the consequence is written on the ceiling of the tent.
Sativa-dominant (the label)
The catalogue term and not a measurable one. The phrase usually means that more of a hybrid’s parents are classed as sativa by the breeder who drafted the listing, and sometimes signals no more than a certain the buds are longer or the aroma brighter than the that breeder’s other lines.
The experience people connect with a word, clear-headed rather than heavy, is driven far more by terpene profile and the THC content than it is by ancestry, and a good number of “sativa-dominant” releases produce a heavy couch effect and plenty of indica-labelled stock do the opposite. For a grower the percentage is useful for a rough guide to growth habit, flowering time and stretch; for a predictor to effect it is close to useless unless accompanied by the aroma notes.
Hermaphroditism in long-flowering lines
The appearance of pollen-bearing flowers on a female plant, typically late in flower and often under stress. Almost every cannabis population has some tendency to it; sativa lines show it more, and the reason is a plain reason: fourteen weeks of flower is fourteen weeks of opportunity for a timer leak, a heat spike or a late watering that can set it off, and an plant that has already waited past its intended finish often throws a few late male sacs on its own in a last effort to make seed.
Not one of these makes a sativa strain weak as a matter of nature; it makes the grower’s consistency matter for a longer stretch. Light-tight tents, steady conditions and cutting the moment the plant is done rather than a weeks later take away the greater part of the problem. A listing that mentions the breeder tests parents for intersex traits is saying something worth hearing for a long-flowering line than for any other category.
Latitude
The one figure that decides if a sativa can finish outdoors, and a number that no pack states. Equatorial plants require a run of shortening days to go on long enough to let the plant ripen; at northern latitudes the frost arrives before that, and the grower harvests a half-finished plant in the end of October or watches it rot in November. The further to the equator, in a northern hemisphere, the later the window runs, and Mediterranean or low-latitude growers can finish lines that temperate gardens never will.
The usable rule for a seed listing: an “outdoor” line finishing month is given for the breeder’s home latitude, usually a point within temperate Europe or the western United States, and every step north of that moves the date later towards the weather. A grower north of roughly the fiftieth parallel who wants a true sativa outdoors is looking for an autoflower or else a greenhouse, not a better summer.
Haze
Originally a specific family of plants put together in 1970s California from Colombian, Thai and Thai parents, and later preserved and refined in the Netherlands. The Haze runs tall, branches openly, flowers for twelve to sixteen weeks and smells of incense, citrus and something sharp that no other line quite reproduces.
In its looser sense “Haze” is any hybrid that contains a share of that family, which today is most of the sativa-leaning market. A listing which reads “Haze” and gives no lineage may be eighty percent the classic family or a small fraction of it, and the grow time follows the fraction, not the name. The working question is never “is it a Haze” but “how much, and via which parent”.
Foxtailing
The habit of some flowers to push out fresh bud growth on top of existing ones, producing towered, irregular buds rather than dense ones. In the majority of indica-leaning strains it is a stress response, typically from light too close or a room too high, and the advice is to correct the cause.
In a good number of sativas, especially Thai and certain Haze lines, it is built in and is going to happen in a perfect room. A first-time sativa grower often wastes a month chasing a fault that was never not a problem, dropping lights and heat and delaying a slow flower even more. The breeder seldom says which kind you should expect; the lineage usually does.
Equatorial (the twelve-hour problem)
Refers to plants from regions where daylength barely changes through the year, and that the plant does not develop a sharp response to changing days. Such lines frequently start flowering slowly under a standard twelve-hour light cycle, since twelve hours is, for them, an unremarkable day rather than a signal.
The working fix, passed down among sativa growers for decades, is to cut the light further: eleven hours, occasionally ten, particularly in the last weeks. It costs a little yield and buys a earlier decisive finish. A listing that says “equatorial” is telling you this in one word, and a grower that reads it as mere geography has missed the instruction inside it.