Sativa seeds come with more jargon attached than any other category of cannabis seed, and a good deal of it means one thing to a botanist, another to a breeder and something different again to the person trying to make a decision in front of the pack. A disappointing sativa grow nearly always goes back to a word that was read in the wrong one of those senses: a flowering time read as a promise, a “sativa-dominant” tag taken as a description of effect, a landrace bought like 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 classic end of the category and that is where the words matter most; the definitions though apply to any sativa seed from any seller. They are in no particular order, since not one of them is sense on its own without the rest.

Haze (the family, not the smell)

Originally a specific family of plants bred in coastal California from Mexican, Thai and South Indian landraces, and then kept and worked in the Netherlands. The Haze grows tall, fills out openly, takes for twelve to sixteen weeks and carries a scent of incense, pine and something metallic that no other line exactly has.

In its looser sense “Haze” is whatever hybrid that carries a share of that family, and by now is a great many of the sativa-leaning catalogue. A listing which says “Haze” and gives no lineage could be mostly percent original old family or a small fraction of it, and the grow character tracks the fraction, not the name. The working question is never “is it a Haze” but “how much, and via which parent”.

Landrace versus heirloom

A population of plants shaped over centuries to one region by local climate and growers alike, rather than by deliberate breeding. Colombian, Colombian, Malawian and Mexican lines are the classic sativa examples. A landrace is a spread, not a one plant: within a pack the heights, flowering times and aromas spread widely than in a tent-bred hybrid, and this variation is the whole value of growing one.

The mistake is buying a landrace as a finished product. It brings habits that made sense in an equatorial field, such as a frame no tent can contain and a flowering rhythm set to an equatorial daylength the majority of growers cannot provide. “Heirloom” in a listing usually means a landrace that has been reproduced away from its origin for some generations, typically with a degree of selection towards tent conditions; it is nearer to manageable but still far from a hybrid. A seller offering “landrace” without a origin point and a reproduction history is applying the word as a flavour, and the seeds should be judged accordingly.

Stretch (the doubling)

The burst of vertical growth that comes after the change to flowering. Most tent-bred plants gain around half their height again; sativas routinely double, and a few equatorial lines go further. The stretch lasts two to four weeks and cannot be stopped once it has started, only bent sideways by training.

In tent terms, a stretch figure is the fact to reading ahead of choosing when to switch. A sativa flipped at sixty centimetres inside a standard tent is at the lamp by week four of flower; one switched at thirty centimetres has room. Growers moving from indica stock nearly always switch far too late the first time, and the lesson is written on the ceiling of the tent.

Foxtailing (and when it is not a fault)

The habit of some flowers to push out fresh calyx growth on top of old ones, giving towered, open buds rather than round ones. In most indica-leaning strains it is a stress response, usually caused by light that is too close or a room too high, and the standard response is to fix the room.

In a good number of sativas, above all Thai and certain Haze lines, it is genetic and is going to happen under a perfect room. A first-time sativa grower frequently spends weeks chasing a fault that was never a problem, lowering lights and temperatures and slowing a long flower further. The breeder seldom says which type to expect; the parentage generally does.

Sativa-dominant (the label)

The catalogue category and not a botanical one. It usually means that more of a hybrid’s parents were classed as sativa by whoever wrote the listing, and sometimes signals no more than a certain the flowers are airier or the smell brighter than the same breeder’s indica-labelled lines.

The experience people associate with a word, clear-headed rather than sedating, is driven far more by terpene profile and the cannabinoid content than it is by the sativa fraction, and a good number of “sativa-dominant” releases produce a flat couch effect and a good number of indica-labelled stock deliver the opposite. To a grower the label is worth something for a rough guide to growth habit, flowering time and stretch; as a predictor to effect it is close to useless without the terpene description.

Flowering time

The number of weeks between the start of flowering and harvest, and the one most frequently misunderstood number on a sativa pack. For photoperiod seed it is measured from the day the light drops to twelve hours, not from germination, so a “fourteen-week” sativa started after an eight-week vegetative stage is a twenty-two-week plant. Breeders additionally give the optimistic end of the range, because the longer end sells fewer seed.

Long-flowering plants take anywhere from ten weeks to more than twenty, and the longest line in the Haze Sativa Seeds range is at about 16 weeks from the switch. The catalogue can be sorted by this number, which is a reasonable first step for a grower on a fixed timetable. A grower who adds four weeks on top of whatever the pack states is rarely caught out.

Hermaphroditism in long-flowering lines

The appearance of male flowers on a female plant, usually late in flower and often in response to stress. Almost every cannabis line has a degree of capacity for it; sativa lines show it more, for a plain reason: fourteen weeks of flower is sixteen weeks of opportunity for a timer leak, a heat spike or a late watering to set it going, and a old that has already gone beyond its natural finish frequently throws a few desperate pollen flowers on its own in a final effort to set seed.

Not one of these means a sativa strain unstable as a matter of course; it means the room’s consistency count for a longer stretch. A sealed room, steady temperatures and cutting when the plant is ready rather than a week after remove the greater part of the risk. A listing that states the breeder screens parents for hermaphrodite traits is worth more for a long-flowering line than on anything else.

Latitude

The single number that decides if a sativa will finish outdoors, and a number no pack states. Equatorial lines require a autumn days to continue long enough for the plant finish; at northern latitudes the frost arrives first, and the grower harvests a half-finished plant in late October or loses it rot in November. The further south, in a northern hemisphere, the later the window runs, and Mediterranean and subtropical gardens can ripen plants that temperate growers cannot.

The usable reading of a seed pack: an “outdoor” line finishing date is stated for the breeder’s own latitude, usually a point in southern Europe or the west coast of the United States, and every step north of it moves the finish later into the frost. A grower above about the fiftieth parallel that wants a long-flowering sativa outdoors is looking for a sativa autoflower or else a covered space, and not a better summer.

Equatorial

Describes plants out of latitudes in which daylength barely changes through the year, which means where the plant does not evolved a sharp reaction to shortening days. These lines frequently start flowering slowly at a standard twelve-hour light cycle, since twelve hours is, to them, a mild ordinary day rather than a signal.

The practical fix, passed down among sativa growers for decades, is to cut the light more: eleven hours, sometimes ten, particularly in the last weeks. It costs a yield yield and buys an earlier clearer finish. A listing that uses “equatorial” is telling you about this in one word, and a grower who takes it as mere origin has missed the point inside it.