Sativa seeds come with more vocabulary around them than any other category of cannabis seed, and a good deal of it says a certain thing to a botanist, something else to a seed company and something different again to the grower standing in front of the pack. The disappointing sativa grow usually traces back to a word that was read in the wrong one of those senses: a flowering time read as a promise, a “sativa-dominant” label read as a description of character, a landrace bought like it were a modern hybrid. The entries below were written with the range at https://hazesativaseeds.com to hand for the concrete examples, since it runs strongly to the classic end of the category and that is where the vocabulary carry the most weight most; the definitions themselves hold to any sativa seed from any seller. They are in no special order, since not one of them is usable on its own without the rest.
Landrace versus heirloom
A population of plants shaped over centuries to one region by local climate and climate together, rather than by deliberate breeding. Thai, Colombian, Malawian and Oaxacan stock are the classic sativa examples. A landrace is a spread, not a single plant: within a pack the heights, finishing times and smells spread widely than a tent-bred line, and that variation is the point of keeping one.
The mistake is treating a landrace as a finished product. It carries traits that make sense in an open field, such as height that no tent can contain and a flowering rhythm set to an daylength the majority of growers cannot offer. “Heirloom” on a listing usually refers to a landrace that has been reproduced away from its origin for some generations, often with light selection towards tent life; it is closer to usable but nonetheless not uniform. A seller listing “landrace” that does not give a collection region and a generation history is applying the word loosely, and the seeds should be judged accordingly.
Sativa-dominant
A marketing category and not a measurable one. It usually indicates that the larger share of a hybrid’s parents are described as sativa by the breeder who wrote the description, and occasionally means no more than a certain the buds are airier or the smell sharper than the same breeder’s indica-labelled releases.
The effect people connect with the word, lively rather than heavy, is governed far more by terpene chemistry and by THC content than it is by the sativa fraction, and a good number of “sativa-dominant” hybrids deliver a flat sleepy effect while a good number of the opposite stock deliver exactly the reverse. To a buyer the percentage is worth something for a rough guide to growth habit, flowering time and stretch; as a predictor to effect it is close to useless unless accompanied by the aroma description.
Latitude
The one figure that decides whether a sativa can finish outdoors, and one no pack states. Long-flowering lines require the run of shortening days to go on long enough for the plant to ripen; at high latitudes the frost comes first, and the grower cuts a half-finished plant in late October or watches it rot in November. A further to the equator, in the northern hemisphere, the later the window stretches, and Mediterranean and low-latitude gardens can finish lines that temperate growers never will.
The usable reading for a seed pack: an “outdoor” line finishing date is given for the breeder’s own latitude, normally somewhere within temperate Europe or the west coast of the United States, and every degree further north of that pushes the date back towards the frost. A grower above roughly the fiftieth parallel that is after a long-flowering sativa in the garden needs to be looking for an autoflower or else a greenhouse, and not a better summer.
Haze
In its first sense a particular family of plants bred in 1970s California from Colombian, Thai and Thai parents, and later preserved and refined in the Netherlands. A true Haze grows tall, fills out sparsely, flowers for twelve to sixteen weeks and carries a scent of spice, pine and something sharp that no line quite reproduces.
In its looser sense “Haze” is whatever hybrid which carries some of that family, and by now is most of the sativa-leaning catalogue. A listing that reads “Haze” and gives no lineage could be mostly percent original classic family or one small fraction of it, and the grow character tracks the share, not the name. The working question is never “is it a Haze” but “how much, and through which parent”.
Foxtailing
The habit of certain flowers to push out new calyx growth on top of existing ones, producing towered, open buds rather than round ones. In most tent-bred strains it is a stress response, usually caused by light that is too close or temperatures too high, and the advice is to fix the room.
In many sativas, above all Southeast Asian and some Haze lines, it is genetic and is going to happen under a flawless room. A first-time sativa grower often wastes weeks hunting a problem that is a problem, lowering lights and heat only delaying an already slow flower further. The breeder rarely says which type to expect; the lineage usually tells you.
Equatorial (the twelve-hour problem)
Refers to lines out of latitudes in which daylength hardly changes through the year, and that the plant does not evolved a strong reaction to changing days. Such plants frequently start flowering slowly under a standard twelve-hour schedule, since twelve hours is, to them, an unremarkable day and not a signal.
The working fix, handed down among sativa growers over decades, is to cut the light more: eleven hours, sometimes ten, particularly in the final weeks. It costs a yield yield and buys an earlier clearer finish. A listing which uses “equatorial” is telling you this with one word, and a grower who takes it as mere origin misses the instruction hidden in it.
Intersex tendency
The appearance of male flowers on a female plant, usually late in flower and often under stress. Every cannabis population carries some capacity to it; sativa lines show it more, and the reason is one plain reason: fourteen weeks of flower is fourteen weeks of exposure for a timer leak, a temperature spike or a late watering that can set it going, and an old that has waited past its natural end frequently throws a few desperate pollen flowers on its own in a last effort to make seed.
Not one of this makes a sativa line unstable as a matter of course; it makes the grower’s consistency count over a longer stretch. A sealed tents, stable conditions and cutting when the plant is ready rather than a weeks later take away most of the problem. A listing which states a breeder tests parents for intersex traits is saying something worth hearing on a sativa than for any else.
Flowering time (and what it is counted from)
The number of weeks between the start of flowering and maturity, which is the single 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 grown with an eight-week vegetative stage is a twenty-two-week plant. Seed companies also quote the optimistic end of the range, because the other end sells fewer seed.
Long-flowering plants run everywhere from ten weeks to well over twenty, and the slowest strain in the Haze Sativa Seeds range is at around 16 weeks from the flip. The catalogue can be sorted by this figure, which is the reasonable first step if you have a room with a tight schedule. A grower who adds four weeks to whatever the pack says is rarely caught out.
Stretch
The burst of upward growth that comes after the change to flowering. Indica-leaning plants add around half their height again; sativas routinely double, and a few landrace types go further. The stretch continues two to five weeks and will not be halted after it has started, merely redirected by training.
In practical terms, a stretch multiplier is a fact worth read before deciding when to flip. A sativa flipped at sixty centimetres centimetres in a two-metre tent is at the lamp before week four of flower; one switched at thirty centimetres centimetres has room. People moving from indica stock almost always switch too late the first time, and the lesson is written on the ceiling of the tent.
Terpinolene (the “sativa smell”)
A aromatic compound present in high amounts in a lot of old sativa strains and responsible for most of the thing people describe as the “sativa” smell: green, woody, citrus and faintly sweet at once. It is fragile, lost quickly through hot drying, and it fades faster during the cure than the heavier terpenes which lead most tent stock.
To a seed buyer the word earns two things. When a listing names terpinolene among the lead aromas, the line most likely carries substantial old-sativa ancestry regardless of what the label claims. And where the you wants that profile to survive to the jar, the drying has to be cool and cool; a fast drying room flattens a terpinolene sativa to something that smells of very little and no trace of what the pack promised.