Sativa seeds arrive with more vocabulary around them than any other category of cannabis seed, and most of it says a certain thing to a botanist, another to a breeder and something different again to the person trying to make a decision in front of the listing. A disappointing sativa grow usually traces back to a word that was read in the wrong one of those senses: a flowering time taken as a promise, a “sativa-dominant” label taken as a statement of effect, a landrace chosen as if it were a modern hybrid. The entries below were written with the range at https://hazesativaseeds.com open for reference, because it runs strongly to the long-flowering end of the category and that is where the vocabulary matter most; the definitions themselves apply to any sativa seed from any seller. They are in no special order, because none of them makes usable on its own without the others.
Stretch (the doubling)
The burst of upward growth that comes after the switch to flowering. Most tent-bred plants add half again; sativas commonly double, and a few equatorial types triple. The stretch continues three to four weeks and will not be stopped once it begins, merely bent sideways by training.
In tent terms, a stretch figure is a number worth read ahead of choosing when to flip. A sativa switched at sixty centimetres centimetres inside a standard tent is touching the lamp before week four of flower; one switched at thirty centimetres has room. Growers moving from indica strains almost always flip too late the first time, and the consequence is visible on the ceiling of the tent.
Equatorial
Refers to lines out of regions in which daylength barely varies across the year, and that the plant never develop a sharp reaction to shortening days. Such plants frequently flower reluctantly at a standard twelve-hour schedule, since twelve hours is, for them, an unremarkable day rather than a signal.
The practical response, handed around among sativa growers over decades, is to cut the light further: eleven hours, sometimes ten, especially during the last weeks. It loses a little yield and gains a more clearer end. A listing that uses “equatorial” is warning you this in one word, and a grower who takes it as a note on geography has missed the point hidden in it.
Sativa-dominant
The catalogue category rather than a measurable one. The phrase generally indicates that more of a hybrid’s parents were classed as sativa according to whoever drafted the description, which occasionally signals nothing more than that the buds are airier or the aroma brighter than the same breeder’s other releases.
The effect people connect with a word, clear-headed instead of heavy, is driven far more by terpene chemistry and the cannabinoid content than by the sativa fraction, and plenty of “sativa-dominant” hybrids produce a heavy sleepy result while a good number of indica-labelled stock deliver the reverse. For a grower the percentage is worth something for a loose hint to growth habit, flowering time and stretch; for a predictor to how it feels it is next to useless without the terpene notes.
Flowering time (and what it is counted from)
The figure of weeks between the start of flowering and maturity, and the one 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 an ordinary vegetative period is a twenty-two-week plant. Seed companies additionally quote the optimistic end of a spread, since the other end sells less seed.
Sativa plants run anywhere from ten weeks to more than twenty, and the longest strain in the Haze Sativa Seeds range is at about 16 weeks from the flip. The catalogue can be filtered by that number, which is a sensible first pass for a grower on a fixed timetable. A grower who allows four weeks on top of whatever the pack states is rarely caught out.
Foxtailing (and when it is not a fault)
The tendency of certain flowers to grow fresh bud clusters on top of existing ones, producing spired, open buds instead of dense ones. In most indica-leaning lines it is a stress response, usually from light too close or temperatures that is too high, and the standard response is to correct the cause.
In many sativas, above all Southeast Asian and some Haze hybrids, it is built in and will happen under a perfect room. A first-time sativa grower frequently spends a month chasing a problem that is a problem, dropping lights and temperatures and delaying an already long flower even more. The breeder seldom warns which kind to expect; the lineage usually does.
Haze
In its first sense a particular family of plants bred in coastal California from Colombian, Thai and Thai landraces, and then kept and worked in the Netherlands. A true Haze grows tall, branches openly, flowers for twelve to to sixteen weeks and carries a scent of incense, pine and a note metallic that no line quite has.
In its second sense “Haze” is whatever cross which carries a share of that family, which today is most of the sativa-leaning catalogue. A listing that says “Haze” and gives no lineage could be eighty percent original old family or a 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”.
Intersex tendency
The production of pollen-bearing flowers on a female plant, typically late in flower and often under stress. Every cannabis line has a degree of tendency for it; long-flowering plants show it more, and the reason is one simple one: sixteen weeks of flower is sixteen weeks of opportunity for a light leak, a heat spike or a late watering that can trigger it going, and a old plant has gone past its intended end frequently throws a few late male flowers on its own as a final effort to set seed.
None of these makes a sativa strain weak as a matter of nature; it makes the grower’s consistency count over longer. Light-tight room, stable temperatures and cutting when the plant is ready rather than a week after take away most of the risk. A listing that mentions the breeder screens parents for hermaphrodite tendency is worth worth hearing for a long-flowering line than on anything other category.
Landrace versus heirloom
A population of plants adapted through centuries to a particular region by the local climate and growers alike, rather than by deliberate selection. Thai, Colombian, Congolese and Oaxacan stock are the sativa cases. A landrace is a spread, not a single plant: within a pack the heights, finishing times and smells spread widely than a tent-bred line, and this spread is the point of keeping one.
The mistake is treating a landrace like a finished product. It carries traits that made sense in an equatorial field, such as a frame no tent can hold and a flowering clock tuned to a equatorial daylength the majority of growers cannot offer. “Heirloom” on a listing generally refers to a landrace that has been reproduced away from its origin over a number of generations, typically with light selection towards indoor life; it is closer to manageable but nonetheless far from a hybrid. A shop listing “landrace” that does not give a collection point and a generation history is using the word as a flavour, and the pack should be priced with that in mind.
Latitude
The one number that decides whether a sativa can finish outdoors, and a number no pack states. Long-flowering plants require the run of shortening days to go on late enough for the plant to finish; at northern latitudes the frost comes before that, and the grower cuts an unripe plant in the end of October or else watches it rot in November. The closer to the equator, in a northern hemisphere, the later the window stretches, and Mediterranean or subtropical gardens can finish lines that temperate gardens never will.
The practical reading for a seed listing: an “outdoor” sativa finishing date is given for the breeder’s own latitude, normally somewhere in temperate Europe or the west coast of the United States, and every degree north of it pushes the finish back towards the frost. A grower above roughly the fiftieth parallel that is after a long-flowering sativa in the garden needs to be shopping for a sativa autoflower or else a covered space, and not a longer summer.