Sativa seeds come with more vocabulary attached than any other kind of cannabis seed, and most of it means a certain thing to a botanist, something else to a seed company and a third to the person trying to make a decision in front of the pack. The failed sativa grow nearly always goes back to a word that was understood in the wrong one of those senses: a flowering time taken as a promise, a “sativa-dominant” tag taken as a statement of character, a landrace chosen like it were a tent-bred hybrid. The entries below are put together with the range at https://hazesativaseeds.com to hand as reference, since it leans heavily to the classic end of the category and that is where the words matter most; the meanings though apply to any sativa seed from any shop. They are in no special order, because not one of them is usable without the others.
Foxtailing
The habit of some flowers to grow fresh bud clusters on top of old ones, giving towered, irregular buds rather than dense ones. In most tent-bred lines it is a stress response, typically caused by light that is too close or a room too high, and the advice is to correct the room.
In a good number of sativas, especially Thai and some Haze lines, it is genetic and will happen under a perfect room. A new sativa grower often spends a month chasing a problem that was never not a problem, dropping lights and heat only slowing an already slow plant even more. The listing seldom warns which kind to expect; the lineage usually tells you.
Stretch
The burst of vertical growth that follows the change to flowering. Indica-leaning plants gain around half their height again; sativas routinely double, and some landrace types go further. The stretch lasts two to four weeks and will not be halted once it begins, merely bent sideways by training.
In tent terms, the stretch multiplier is a fact worth read before deciding when to flip. A sativa switched at sixty centimetres in a two-metre tent is touching the lamp by week four of flower; one flipped at thirty centimetres has room. People moving over from indica strains almost always flip too late the first time, and the consequence is written on the ceiling of the tent.
Equatorial (the twelve-hour problem)
Describes lines from latitudes in which daylength barely varies through the year, and that the plant does not evolved a strong reaction to changing days. Such plants frequently start flowering slowly at a standard twelve-hour light cycle, because twelve hours is, to them, an ordinary day and not a signal.
The practical response, passed around between sativa growers for decades, is to shorten the light more: eleven hours, occasionally ten, particularly in the final weeks. It costs a yield yield and gains a earlier clearer finish. A listing which uses “equatorial” is warning you about this in one word, and a grower that takes it as a note on geography has missed the instruction hidden in it.
Landrace versus heirloom
A population of plants shaped through centuries to one region by the local climate and climate alike, rather than by deliberate selection. Colombian, Thai, Malawian and Oaxacan lines are the classic sativa cases. A landrace is variable, rather than a one plant: within a pack the heights, finishing times and aromas range far more than in any tent-bred line, and this spread is the point of growing one.
The trap is treating a landrace as a finished product. It brings habits that make sense in an equatorial field, including height that no tent can hold and a flowering clock tuned to an daylength the majority of growers never offer. “Heirloom” in a listing generally refers to a landrace that has been reproduced away from its origin for some generations, typically with a degree of selection towards indoor conditions; it is closer to usable but still not a hybrid. A shop listing “landrace” without a origin region and a generation count is using the word as a flavour, and the seeds should be judged accordingly.
Terpinolene (the “sativa smell”)
A terpene present in large amounts in many classic sativa lines and responsible for most of what people describe as the “sativa” smell: fresh, woody, lemon and faintly floral all at once. It is volatile, lost easily by fast drying, and terpinolene degrades more quickly during storage than the heavier terpenes which lead indica-leaning stock.
For a seed buyer the name earns two jobs. When a listing lists terpinolene among the leading aromas, the strain probably carries real old-sativa genetics whatever the percentage says. And where the grower wants that profile to survive to the jar, the drying has to be slow and slow; a fast drying room turns a terpinolene sativa to something that smells of very little and no trace of what the pack promised.
Haze
Originally a specific family of plants bred in coastal California from Mexican, Thai and Thai landraces, and then preserved and refined in the Netherlands. A true Haze grows tall, fills out sparsely, flowers for twelve to sixteen weeks and smells of incense, citrus and something sharp that no line quite reproduces.
In its second sense “Haze” is whatever hybrid which carries a share of that family, which by now is a great many of the sativa-leaning market. A listing that says “Haze” and gives no lineage may be mostly percent the old family or one sixteenth of it, and the flowering time follows the fraction, not the name. The useful question is never “is it a Haze” but “how much, and through which parent”.
Flowering time
The number of weeks between the start of flowering and harvest, which is the one most frequently misunderstood number on a sativa pack. With photoperiod seed it is counted from the day the light drops to twelve hours, not from sowing, so a “fourteen-week” sativa grown after an eight-week vegetative stage is a twenty-two-week plant. Breeders also give the optimistic end of the spread, because the other end sells fewer seed.
Sativa lines run everywhere from ten weeks to well over twenty, and the longest line in the Haze Sativa Seeds range is at about 16 weeks after the switch. The catalogue can be filtered by this number, which is a reasonable first pass if you have a grower on a tight timetable. A grower who adds four weeks to whatever the pack says is seldom caught out.
Sativa-dominant
The marketing term and not a botanical one. The phrase generally means that more of a hybrid’s parents were described as sativa by the breeder who wrote the description, which occasionally signals no more than that the flowers are airier or the smell sharper than the same breeder’s other releases.
The effect people connect with a word, lively instead of heavy, is governed far more by terpene chemistry and the cannabinoid balance than it is by the sativa fraction, and a good number of “sativa-dominant” releases deliver a flat sleepy effect while a good number of indica-labelled lines deliver the reverse. To a grower the label is useful for a loose hint to growth habit, flowering time and stretch; as a predictor to effect it is close to worthless unless accompanied by the terpene description.
Intersex tendency
The appearance of male flowers on a female plant, typically towards the end in flower and frequently in response to stress. Every cannabis population has some capacity for it; long-flowering lines express it more, for one simple reason: sixteen weeks of flower is sixteen weeks of exposure for a timer leak, a heat spike or a late watering that can trigger it off, and an old plant has already waited beyond its intended finish often produces a few late pollen sacs on its own in a last effort to make seed.
None of this means a sativa line weak as a matter of course; it means the grower’s consistency matter over longer. Light-tight tents, steady temperatures and harvesting the moment the plant is done and not a week later remove the greater part of the risk. A listing that mentions the breeder screens parents for intersex traits is worth more for a long-flowering line than on anything else.