Sativa seeds arrive with more vocabulary around them than any other kind of cannabis seed, and a good deal of it means one thing to a botanist, something else to a seed company and a third to the grower trying to make a decision in front of the listing. The failed sativa grow usually goes back to a word that was read in the wrong sense: a flowering time taken as a fixed number, 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 to hand for reference, because it leans strongly to the classic end of the category where the vocabulary carry the most weight most; the definitions though hold to any sativa seed from any shop. They are given in no special order, since not one of them makes sense without the rest.
Latitude
The single number that determines if a sativa can ripen outdoors, and a number that no pack states. Long-flowering lines need a autumn days to continue long enough to let the plant to ripen; in northern latitudes the frost comes first, and the grower cuts a unripe plant in late October or else watches it to mould in November. The closer to the equator, within a northern hemisphere, the later the season runs, and Mediterranean and low-latitude gardens can finish plants that northern growers cannot.
The practical reading for a seed pack: an “outdoor” line harvest date is stated for the breeder’s home latitude, normally somewhere 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 north of roughly the fiftieth parallel who wants a true sativa outdoors is shopping for an autoflower or a greenhouse, and not a better summer.
Equatorial
Describes plants from regions where daylength hardly varies across the year, and that the plant does not evolved a sharp reaction to changing days. These plants frequently start flowering reluctantly under a conventional twelve-hour light cycle, because twelve hours is, to them, an unremarkable day rather than a signal.
The practical fix, passed down between sativa growers for decades, is to shorten the light more: eleven hours, occasionally ten, especially during the last weeks. It loses some little yield and buys a more clearer finish. A listing which says “equatorial” is telling you this in one word, and a grower that takes it as mere geography has missed the point inside it.
Landrace versus heirloom
A population of plants adapted through generations to a particular place by local growers and growers alike, rather than by modern selection. Thai, Colombian, Malawian and Mexican lines are the sativa cases. A landrace is variable, not a single plant: inside a pack the heights, finishing times and aromas range far more than any tent-bred line, and that spread is the whole value of keeping one.
The mistake is treating a landrace like a finished hybrid. It brings traits that made sense in an equatorial field, including height no tent can contain and a flowering clock tuned 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, often with light selection towards tent conditions; it is closer to manageable but still not a hybrid. A seller offering “landrace” that does not give a collection region and a reproduction history is applying the word as a flavour, and the pack should be judged accordingly.
Flowering time (and what it is counted from)
The figure of weeks from the start of flowering and harvest, which is the one most misunderstood figure on a sativa pack. With photoperiod seed it is measured from the day the light is cut to twelve hours, not from germination, so a “fourteen-week” sativa started with a ordinary vegetative period is a five-month plant. Seed companies additionally quote the optimistic end of the spread, since the longer end moves less seed.
Sativa plants run anywhere from ten weeks to well over twenty, and the slowest strain in the Haze Sativa Seeds range comes in at about 16 weeks after the switch. The catalogue can be filtered by that figure, which is a sensible first pass if you have a room with a fixed timetable. A grower who allows four weeks on top of whatever the pack states is rarely caught out.
Haze (the family, not the smell)
In its first sense a specific line of plants bred in coastal California from Mexican, Thai and Thai landraces, and then kept and worked in the Netherlands. A true Haze grows tall, fills out sparsely, flowers for twelve to sixteen weeks and smells of spice, pine and a note metallic that no line exactly reproduces.
In its looser sense “Haze” is whatever cross which contains a share of that family, and by now is most of the sativa-leaning catalogue. A listing which says “Haze” without lineage may be mostly percent the old family or a small fraction of it, and the grow character tracks the share, not the name. The working question is not “is it a Haze” but “how much, and via which parent”.
Sativa-dominant (the label)
The catalogue term and not a botanical one. The phrase usually means that the larger share of a hybrid’s parents were described as sativa according to whoever wrote the description, and sometimes signals nothing more than a certain the buds are longer or the smell sharper than the same breeder’s other lines.
The effect people connect with a word, lively rather than heavy, is driven more by terpene chemistry and the cannabinoid content than it is by the sativa fraction, and plenty of “sativa-dominant” hybrids produce a heavy sleepy effect and plenty of indica-labelled lines do the reverse. To a buyer the percentage is useful as a rough hint to growth habit, flowering time and stretch; as a predictor to effect it is close to worthless without the aroma description.
Stretch (the doubling)
The burst of upward growth that follows the change to flowering. Indica-leaning plants gain around half again; sativas routinely double, and a few landrace lines go further. The stretch lasts two to five weeks and cannot be stopped after it has started, merely redirected by training.
In practical terms, the stretch multiplier is the number to reading before deciding when to switch. A sativa flipped at sixty centimetres centimetres inside a standard tent is at the lamp by week four of flower; one switched at thirty centimetres has room. People coming over from indica stock nearly always switch too late the first time, and the lesson is visible on the ceiling of the tent.
Intersex tendency
The production of male flowers on a female plant, typically late in flower and often under stress. Every cannabis population carries some capacity for do; long-flowering plants show it more, for a simple reason: fourteen weeks of flower is fourteen weeks of opportunity for a timer leak, a temperature spike or a late watering that can set it going, and a old that has waited past its intended finish frequently produces a few desperate pollen sacs on its own in a final effort to set seed.
None of these means a sativa line unstable as a matter of course; it makes the grower’s discipline count over a longer stretch. A sealed room, stable conditions and harvesting the moment the plant is done and not a week later take away most of the problem. A listing that mentions the breeder screens parents for intersex traits is saying something more for a sativa than for anything else.
Terpinolene
A terpene present in large amounts in many old sativa lines and accounting for much of the thing people mean as a “sativa” aroma: green, piney, lemon and faintly sweet all at once. It is volatile, driven off easily through fast drying, and terpinolene fades faster during the cure than the earthier terpenes which lead indica-leaning stock.
For a seed buyer the word does two jobs. When a listing names terpinolene among the lead terpene, the strain most likely has real old-sativa genetics whatever the percentage claims. And when the you are after that profile to survive to the jar, the cure has to be slow and cool; a fast drying room turns a terpinolene line into something that smells of hay and leaves nothing of what the pack described.
Foxtailing (and when it is not a fault)
The tendency of certain flowers to push out fresh calyx growth on top of existing ones, producing spired, irregular buds rather than dense ones. In the majority of 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 fix the cause.
In a good number of sativas, above all Thai and some Haze hybrids, it is genetic and will occur in a flawless room. A new sativa grower frequently spends a month chasing a problem that is not a problem, lowering lights and temperatures and slowing an already slow plant further. The breeder seldom says which kind you should expect; the parentage generally does.
