Sativa seeds arrive with more vocabulary attached than any other category of cannabis seed, and most of it means one thing to a botanist, something else 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 understood in the wrong one of those senses: a flowering time read as a promise, a “sativa-dominant” label taken as a description of character, a landrace bought as if it were a tent-bred hybrid. The entries below are put together with the range at https://hazesativaseeds.com to hand for reference, because it runs heavily to the long-flowering end of the spectrum 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 sense on its own without the rest.
Latitude
The one number that determines whether a sativa will ripen outdoors, and one no pack states. Equatorial plants require the autumn days to go on late enough for the plant ripen; at northern latitudes the frost arrives before that, and the grower cuts an unripe plant in the end of October or else loses it to mould in November. A closer south, within the northern hemisphere, the later the window runs, and coastal and subtropical growers are able to finish plants that temperate gardens never will.
The usable rule for a seed pack: an “outdoor” line harvest date is stated for the breeder’s home latitude, usually somewhere within southern Europe or the western United States, and each degree north of that pushes the date back into the frost. A grower above roughly the fiftieth parallel that is after a true sativa outdoors is looking for an autoflower or else a covered space, and not a longer summer.
Landrace
A population of plants adapted over centuries to one region by the local climate and climate together, and not by modern breeding. Thai, Colombian, Malawian and Oaxacan lines are the sativa cases. A landrace is variable, not a single plant: within a pack the heights, finishing times and smells spread widely than any tent-bred line, and this variation is the whole value of growing one.
The trap is treating a landrace as a finished product. It brings traits that make sense in an equatorial field, such as a frame no tent can contain and a flowering clock set to an daylength most growers cannot offer. “Heirloom” in a listing usually means a landrace that has been grown out somewhere over a number of generations, often with a degree of selection towards tent life; it is closer to manageable but still not a hybrid. A seller listing “landrace” that does not give an origin region and a reproduction history is using the word as a flavour, and the seeds should be priced accordingly.
Foxtailing (and when it is not a fault)
The tendency of certain flowers to grow new bud growth on top of old ones, producing towered, irregular buds instead of dense ones. In most tent-bred strains it is a heat symptom, typically caused by light too close or a room too high, and the standard response is to correct the cause.
In many sativas, especially Thai and some Haze lines, it is genetic and will occur under a perfect room. A first-time sativa grower often wastes weeks hunting a problem that is not there, dropping lights and heat only delaying a long flower even more. The listing rarely says which type to expect; the parentage usually tells you.
Equatorial
Describes lines from latitudes where daylength barely varies through the year, which means that the plant never develop a sharp response to shortening days. These lines frequently flower reluctantly at a standard twelve-hour light cycle, because twelve hours is, for them, a mild unremarkable day and not a signal.
The practical response, handed around between sativa growers over decades, is to cut the light more: eleven hours, sometimes ten, particularly during the last weeks. It loses a little yield and buys an more clearer finish. A listing that uses “equatorial” is telling you this with one word, and a grower that reads it as mere geography misses the point hidden in it.
Flowering time (and what it is counted from)
The number of weeks between the onset of flowering and harvest, and the single most misunderstood figure on a sativa pack. For photoperiod seed it is measured from the day the light drops to twelve hours, rather than from germination, so a “fourteen-week” sativa grown after an eight-week vegetative period is a five-month plant. Seed companies also give the shorter end of a spread, because the longer end moves less seed.
Long-flowering plants take anywhere from ten weeks to more than twenty, and the longest line in the Haze Sativa Seeds range comes in at around 16 weeks after the switch. The catalogue can be sorted by that figure, which is a sensible first pass if you have a grower with a fixed schedule. A grower who adds four weeks on top of whatever the pack says is seldom caught out.
Haze
In its first sense a specific line of plants put together in coastal California from Mexican, Thai and Thai parents, and later preserved and worked in the Netherlands. A true Haze grows tall, branches openly, takes for twelve to to sixteen weeks and carries a scent of incense, citrus and a note sharp that no other line quite reproduces.
In its second sense “Haze” is any hybrid that contains some of that family, which today is most of the sativa-leaning catalogue. A listing which reads “Haze” without lineage may be eighty percent original old family or a small fraction of it, and the grow character tracks the fraction, not the name. The working question is not “is it a Haze” but “how much, and through which parent”.
Hermaphroditism in long-flowering lines
The production of pollen-bearing flowers on a female plant, usually towards the end in flower and frequently in response to stress. Every cannabis population has some tendency to it; long-flowering plants show it more often, for 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 off, and an plant that has already waited past its natural finish frequently throws a few desperate pollen flowers on its own as a last attempt to make seed.
Not one of these means a sativa strain unstable by course; it means the grower’s discipline matter for a longer stretch. Light-tight room, steady conditions and cutting when the plant is done and not two weeks later take away the greater part of the problem. A listing which states the breeder screens parents for intersex traits is saying something worth hearing for a long-flowering line than on anything else.
Stretch (the doubling)
The burst of vertical growth that comes after the change to flowering. Most tent-bred plants gain half again; sativas routinely double, and some equatorial types triple. The stretch continues three to four weeks and cannot be halted once it has started, merely bent sideways by training.
In practical terms, the stretch figure is the fact worth read ahead of deciding when to switch. A sativa flipped at sixty centimetres in a two-metre tent is touching the lamp by week four of flower; one switched at thirty centimetres has room. People coming over from indica strains almost always flip too late the first time, and the lesson is visible on the ceiling of the tent.
Terpinolene
A terpene present in high proportion in a lot of classic sativa strains and accounting for much of what people describe as the “sativa” aroma: fresh, piney, lemon and faintly floral at once. It is volatile, driven off quickly by hot drying, and terpinolene degrades faster in the cure than the earthier terpenes that lead indica-leaning stock.
To a seed buyer the name earns two jobs. Where a listing lists terpinolene as the lead terpene, the strain most likely has substantial old-sativa genetics whatever the label claims. And when the grower wants that smell to still be there by the jar, the cure has to be slow and cool; a fast dry flattens a terpinolene sativa into a flower that tastes of very little and leaves no trace of what the pack promised.