Sativa seeds come with more vocabulary attached than any other kind of cannabis seed, and a good deal of it says one thing to a botanist, something else to a breeder and a third to the grower trying to make a decision in front of the listing. A failed sativa grow nearly always goes back to a word that was understood in the wrong one of those senses: a flowering time taken as a fixed number, a “sativa-dominant” label read as a statement of character, a landrace chosen as if 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 heavily to the classic end of the category where the words matter most; the definitions though hold to any sativa seed from any seller. They are given in no special order, because none of them makes usable on its own without the rest.
Sativa-dominant (the label)
The marketing term and not a botanical one. The phrase usually means that more of a hybrid’s lineage were described as sativa according to whoever drafted the description, and occasionally means nothing more than that the buds are longer or the aroma brighter than the that breeder’s other releases.
The experience people associate with the word, clear-headed instead of heavy, is driven more by terpene profile and by THC balance than by the sativa fraction, and plenty of “sativa-dominant” hybrids deliver a flat couch result while a good number of the opposite stock deliver exactly the opposite. For a grower the label is useful for a rough hint to growth habit, flowering time and stretch; for a guide to effect it is close to useless unless accompanied by the terpene notes.
Haze
Originally a particular family of plants put together in coastal California from Colombian, Colombian and South Indian parents, and later kept and refined in the Netherlands. The Haze grows tall, branches openly, takes for twelve sixteen weeks and smells of incense, citrus and something sharp that no other line quite reproduces.
In its second sense “Haze” is any cross which carries some of that family, and by now is most of the sativa-leaning market. A listing that says “Haze” without parents could be eighty percent the classic family or one small fraction of it, and the grow time follows the share, not the name. The working question is never “is it a Haze” but “how much, and through which parent”.
Equatorial (the twelve-hour problem)
Describes lines out of latitudes in which daylength barely varies through the year, which means where the plant does not develop a strong response to shortening days. These plants often start flowering reluctantly under a conventional twelve-hour light cycle, since twelve hours is, for them, a mild unremarkable day and not a signal.
The practical response, handed around among sativa growers over decades, is to shorten the light further: eleven hours, sometimes ten, especially during the final weeks. It loses some little yield and gains a earlier clearer end. A listing that uses “equatorial” is telling you about this with one word, and a grower who reads it as a note on origin misses the instruction inside it.
Terpinolene
A terpene present in large proportion in many old sativa strains and accounting for much of the thing people mean as the “sativa” smell: green, woody, citrus and slightly floral all at once. It is fragile, lost easily through hot drying, and terpinolene fades more quickly in the cure than the earthier terpenes that lead indica-leaning stock.
To a seed buyer the word earns two things. When a listing names terpinolene as the leading terpene, the strain probably has real old-sativa ancestry regardless of what the label claims. And where the grower are after that smell to still be there to the jar, the cure is going to be slow and slow; a fast drying room flattens a terpinolene sativa into something that tastes of very little and leaves no trace of what the pack promised.
Landrace
A population of plants shaped over centuries to one region by the local climate and growers alike, and not by deliberate breeding. Colombian, Thai, Congolese and Mexican stock are the classic sativa examples. A landrace is a spread, rather than a one plant: within a pack the flowering times, flowering times and aromas range widely than in any tent-bred hybrid, and this spread is the point of keeping one.
The trap is treating a landrace like a finished hybrid. It carries habits that made sense in an open field, such as a frame no tent can contain and a flowering rhythm tuned to an equatorial daylength most growers never offer. “Heirloom” on a listing usually refers to a landrace that has been grown out somewhere for some generations, often with light selection for indoor conditions; it is closer to usable but nonetheless far from uniform. A shop offering “landrace” without an origin region and a generation count is using the word as a flavour, and the pack should be judged accordingly.
Flowering time (and what it is counted from)
The number of weeks between the start of flowering and harvest, and the one most misunderstood figure on a sativa pack. For photoperiod seed it is measured from the day the light drops to twelve hours, not from sowing, so a “fourteen-week” sativa grown after an eight-week vegetative period is a five-month plant. Breeders also quote the shorter end of the range, because the other end sells fewer seed.
Sativa lines run anywhere from ten weeks to more than twenty, and the longest line in the Haze Sativa Seeds range is at around 16 weeks after the flip. The catalogue can be sorted by that figure, which is the reasonable first pass for a grower on a tight schedule. A grower who allows four weeks to the figure the pack states is rarely caught out.
Intersex tendency
The production of pollen-bearing flowers on a female plant, typically late in flower and frequently in response to stress. Almost every cannabis population carries some capacity for it; sativa lines express it more often, for a simple reason: sixteen weeks of flower is fourteen weeks of opportunity for a timer leak, a heat spike or a late watering that can set it going, and an plant that has already waited beyond its natural end frequently produces a few late male flowers on its own in a last effort to make seed.
Not one of these means a sativa strain weak by nature; it makes the grower’s discipline count over longer. Light-tight room, stable conditions and harvesting when the plant is ready rather than two weeks later remove most of the problem. A listing which mentions a breeder screens parents for intersex tendency is saying something more for a long-flowering line than on any else.
Stretch (the doubling)
The surge of upward growth that follows the switch to flowering. Indica-leaning plants add half again; sativas routinely double, and a few equatorial types go further. The stretch lasts three to five weeks and cannot be halted once it begins, only bent sideways by training.
In practical terms, the stretch multiplier is a number worth reading before choosing when to flip. A sativa switched at sixty centimetres in a standard tent is touching the lamp by week four of flower; one switched at thirty centimetres has room. Growers moving over from indica strains almost always flip far too late the first time, and the lesson is visible on the ceiling of the tent.
Foxtailing
The habit of some flowers to push out fresh calyx clusters on top of existing ones, giving spired, irregular buds instead of dense ones. In the majority of tent-bred strains it is a heat symptom, usually caused by light that is too close or temperatures that is too high, and the advice is to fix the room.
In many sativas, above all Thai and some Haze lines, it is genetic and will occur in a perfect room. A new sativa grower often wastes a month hunting a fault that is not there, lowering lights and heat and delaying a slow flower further. The breeder seldom says which kind you should expect; the parentage generally does.
