Sativa seeds arrive with more jargon around them than any other category of cannabis seed, and most of it says one 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 listing. The disappointing sativa grow nearly always goes back to a word that was understood in the wrong one of those senses: a flowering time read as a fixed number, a “sativa-dominant” tag taken as a description of effect, a landrace chosen like it were a modern hybrid. The entries below were put together with the range at https://hazesativaseeds.com to hand for the concrete examples, since it leans strongly to the classic end of the category and that is where the vocabulary matter most; the definitions themselves apply to any sativa seed from any shop. They are given in no special order, because none of them is usable on its own without the others.

Haze (the family, not the smell)

Originally a particular family of plants put together in 1970s California from Mexican, Colombian and South Indian parents, and then preserved and refined in the Netherlands. The Haze grows tall, branches openly, takes for twelve to sixteen weeks and carries a scent of incense, citrus and a note sharp that no line exactly reproduces.

In its second sense “Haze” is any hybrid that carries a share of that family, and today is most of the sativa-leaning catalogue. A listing that reads “Haze” without lineage may be mostly percent original classic family or a sixteenth of it, and the grow character follows the fraction, not the name. The useful question is not “is it a Haze” but “how much, and through which parent”.

Stretch (the doubling)

The surge of upward growth that comes after the change to flowering. Most tent-bred plants add around half their height again; sativas routinely double, and a few landrace types go further. The stretch lasts three to five weeks and will not be stopped once it has started, merely redirected by training.

In tent terms, the stretch figure is a number to read before deciding when to flip. A sativa switched at sixty centimetres centimetres in a two-metre tent is touching the lamp by week four of flower; one flipped at thirty centimetres has room. People coming from indica strains almost always switch too late the first time, and the lesson is visible on the ceiling of the tent.

Equatorial (the twelve-hour problem)

Refers to plants from latitudes where daylength barely changes across the year, which means where the plant never evolved a strong reaction to changing days. These lines frequently start flowering slowly under a conventional twelve-hour light cycle, since twelve hours is, to them, an ordinary day and not a signal.

The working fix, handed around between sativa growers over decades, is to shorten the light more: eleven hours, occasionally ten, particularly during the last weeks. It loses a little yield and buys a earlier decisive finish. A listing that uses “equatorial” is telling you about this with one word, and a grower that takes it as mere origin misses the instruction hidden in it.

Landrace versus heirloom

A population of plants adapted through generations to a particular region by local growers and growers together, rather than by deliberate breeding. Colombian, Colombian, Malawian and Mexican stock are the sativa examples. A landrace is variable, rather than a single plant: inside a pack the heights, flowering times and smells spread widely than a tent-bred line, and that spread is the point of keeping one.

The trap is treating a landrace like a finished hybrid. It brings traits that made sense in an equatorial field, including a frame no tent can contain and a flowering rhythm set to a equatorial daylength most growers never offer. “Heirloom” on a listing usually refers to a landrace that has been reproduced somewhere for a number of generations, typically with a degree of selection towards tent life; it is closer to manageable but still far from uniform. A shop listing “landrace” without a collection point and a reproduction count is applying the word loosely, and the seeds should be judged accordingly.

Flowering time

The number of weeks between the onset of flowering and harvest, and the single most frequently misread number on a sativa pack. With photoperiod seed it is measured from the day the light drops to twelve hours, not from sowing, so a “fourteen-week” sativa started after an ordinary vegetative period is a five-month plant. Seed companies additionally quote the optimistic end of a range, because the other end moves fewer seed.

Sativa lines run anywhere from ten weeks to well over twenty, and the longest line in the Haze Sativa Seeds range is at around 16 weeks after the switch. The catalogue can be sorted by this figure, which is a reasonable first pass for a room on a tight schedule. A grower who allows four weeks to the figure the pack says is rarely caught out.

Intersex tendency

The appearance of pollen-bearing flowers on a female plant, usually late in flower and often under stress. Every cannabis population carries some tendency to it; sativa lines express it more, and the reason is one plain reason: sixteen weeks of flower is fourteen weeks of exposure for a timer leak, a temperature spike or a missed watering that can trigger it off, and an old that has already gone past its natural end frequently throws a few desperate pollen flowers on its own in a last effort to make seed.

None of these means a sativa strain weak by course; it makes the room’s consistency count for a longer stretch. Light-tight tents, steady temperatures and harvesting the moment the plant is ready rather than two weeks later remove most of the problem. A listing which mentions the breeder tests parents for intersex traits is worth worth hearing for a long-flowering line than for any else.

Terpinolene

A terpene found in large proportion in a lot of old sativa strains and accounting for much of the thing people describe as the “sativa” smell: green, piney, lemon and slightly floral at once. It is volatile, lost easily through fast drying, and it fades faster in storage than the heavier terpenes which lead indica-leaning lines.

For a seed buyer the name does two things. Where a listing lists terpinolene among the lead terpene, the strain probably has substantial Haze-era ancestry whatever the label says. And when the you wants that profile to survive by the jar, the cure is going to be slow and cool; a warm dry flattens a terpinolene sativa to a flower that tastes of hay and nothing of what the pack promised.

Sativa-dominant (the label)

A marketing term rather than a measurable one. It generally means that more of a hybrid’s parents were described as sativa by the breeder who wrote the listing, which occasionally signals nothing more than a certain the buds are airier or the smell brighter than the that breeder’s other lines.

The effect people associate with the word, lively rather than heavy, is driven more by terpene profile and by THC content than by the sativa fraction, and plenty of “sativa-dominant” hybrids deliver a heavy couch effect and a good number of the opposite stock do exactly the reverse. For a grower the percentage is useful for a rough guide to growth habit, flowering time and stretch; as a predictor to effect it is next to worthless unless accompanied by the aroma notes.

Foxtailing (and when it is not a fault)

The tendency of some flowers to grow fresh bud growth on top of existing ones, producing towered, irregular buds rather than round ones. In most tent-bred strains it is a stress symptom, usually caused by light that is too close or temperatures too high, and the advice is to correct the room.

In a good number of sativas, above all Southeast Asian and certain Haze hybrids, it is genetic and is going to happen under a flawless room. A first-time sativa grower frequently wastes weeks chasing a fault that was never there, dropping lights and heat only slowing an already slow flower further. The breeder rarely says which kind you should expect; the parentage generally tells you.