Sativa seeds arrive with more jargon attached than any other category of cannabis seed, and most of it means a certain thing to a botanist, something else to a breeder and a third to the person standing in front of the listing. A disappointing sativa grow nearly always 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 description 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 leans strongly 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 shop. They are in no particular order, because not one of them makes sense on its own without the rest.
Flowering time (and what it is counted from)
The number of weeks from the onset of flowering and harvest, and the one most frequently misread 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 started after a eight-week vegetative period is a five-month plant. Seed companies also give the shorter end of the spread, because the longer end moves fewer seed.
Sativa lines take anywhere from ten weeks to well over twenty, and the longest strain in the Haze Sativa Seeds range comes in at around 16 weeks after the flip. The catalogue can be filtered by this number, which is a reasonable first step if you have a room with a tight schedule. A grower who allows four weeks to the figure the pack says is seldom disappointed.
Landrace versus heirloom
A population of plants adapted over centuries to one region by local growers and growers together, rather than by deliberate breeding. Colombian, Thai, Malawian and Oaxacan stock are the classic sativa cases. A landrace is a spread, not a single plant: inside a pack the flowering times, finishing times and aromas spread far more than any tent-bred line, and this spread is the point of keeping one.
The trap is buying a landrace like a finished product. It brings habits that make sense in an open field, such as a frame that no tent can hold and a flowering rhythm tuned to an daylength most growers never provide. « Heirloom » on a listing generally means a landrace that has been reproduced away from its origin over some generations, typically with light selection towards indoor life; it is closer to manageable but still far from a hybrid. A seller listing « landrace » that does not give an collection region and a reproduction history is applying the word as a flavour, and the pack should be judged accordingly.
Latitude (outdoor sativas)
The one number that determines whether a sativa will ripen outdoors, and a number that no pack states. Long-flowering lines need a autumn days to go on late enough for the plant to ripen; at high latitudes the frost arrives before that, and the grower cuts a unripe plant in the end of October or loses it rot in November. A closer south, in a northern hemisphere, the longer the window runs, and Mediterranean or low-latitude gardens can ripen plants that temperate gardens never will.
The practical reading of a seed listing: an « outdoor » sativa finishing month is stated for the breeder’s home latitude, usually somewhere in southern Europe or the western United States, and each step north of it moves the finish later into the weather. A grower north of roughly the fiftieth parallel that wants a long-flowering sativa outdoors is shopping for a sativa autoflower or a covered space, and not a better summer.
Foxtailing
The habit of certain flowers to push out new calyx growth on top of existing ones, giving spired, irregular buds rather than round ones. In the majority of indica-leaning strains it is a heat response, usually caused by light that is too close or temperatures too high, and the advice is to correct the room.
In many sativas, especially Thai and certain Haze lines, it is built in and will happen under a flawless room. A first-time sativa grower frequently spends a month chasing a fault that was never not a problem, lowering lights and temperatures only delaying an already slow flower further. The breeder rarely says which type to expect; the parentage generally tells you.
Sativa-dominant (the label)
The marketing term and not a botanical one. The phrase generally means that the larger share of a hybrid’s parents are described as sativa by whoever wrote the description, and occasionally signals no more than that the flowers are airier or the aroma brighter than the same breeder’s indica-labelled lines.
The effect people connect with a word, lively instead of heavy, is driven far more by terpene chemistry and the THC balance than by ancestry, and plenty of « sativa-dominant » hybrids produce a flat sleepy effect and a good number of indica-labelled lines deliver the opposite. For a buyer the percentage is useful for a rough hint to growth habit, flowering time and stretch; for a guide to effect it is next to useless without the aroma notes.
Terpinolene (the « sativa smell »)
A terpene present in large proportion in many classic sativa strains and responsible for much of what people mean as a « sativa » aroma: green, woody, lemon and slightly floral at once. It is volatile, lost easily through fast drying, and it fades more quickly during storage than the earthier terpenes which dominate indica-leaning lines.
For a seed buyer the name does two jobs. Where a listing names terpinolene among the leading terpene, the line probably carries real Haze-era ancestry regardless of what the percentage says. And when the grower are after that smell to still be there to the jar, the cure has to be slow and cool; a fast drying room turns a terpinolene sativa into a flower that smells of very little and leaves no trace of what the pack described.
Hermaphroditism in long-flowering lines
The appearance of male flowers on a female plant, typically towards the end in flower and often under stress. Every cannabis line carries some capacity to it; long-flowering lines show it more, and the reason is one simple one: sixteen weeks of flower is fourteen weeks of exposure for a timer leak, a heat spike or a late watering that can set it going, and a plant that has waited beyond its natural finish frequently produces a few late male flowers on its own as a final attempt to set seed.
Not one of these makes a sativa strain weak as a matter of course; it means the grower’s consistency count for a longer stretch. Light-tight room, steady temperatures and cutting the moment the plant is ready and not two weeks later remove the greater part of the problem. A listing which states the breeder screens parents for intersex traits is worth more on a sativa than on anything else.
Haze
In its first sense a specific family of plants put together in 1970s California from Mexican, Colombian and Thai parents, and then kept and refined in the Netherlands. The Haze grows tall, fills out openly, flowers for twelve sixteen weeks and carries a scent of incense, pine and a note metallic that no other line exactly reproduces.
In its second sense « Haze » is whatever hybrid which contains a share of that family, which today is a great many of the sativa-leaning market. A listing which reads « Haze » without lineage may be eighty percent the classic family or a small fraction of it, and the grow time tracks the share, not the name. The useful question is never « is it a Haze » but « how much, and via which parent ».
Stretch
The burst of vertical growth which comes after the change to flowering. Most tent-bred plants gain half again; sativas commonly double, and some landrace types go further. The stretch lasts two to four weeks and cannot be stopped once it begins, only bent sideways by training.
In tent terms, the stretch figure is a number to reading before choosing when to flip. A sativa switched at sixty centimetres inside a standard tent is touching the lamp by week four of flower; one flipped at thirty centimetres centimetres has room. People moving over from indica stock nearly always flip too late the first time, and the consequence is visible on the ceiling of the tent.