Sativa seeds arrive with more jargon around them than any other category of cannabis seed, and most of it says a certain thing to a botanist, another to a seed company and something different again to the grower standing in front of the pack. A failed sativa grow nearly always goes back to a word that was read in the wrong sense: a flowering time taken as a fixed number, a “sativa-dominant” label read as a description of character, a landrace chosen like it were a tent-bred hybrid. The entries below were written with the range at https://hazesativaseeds.com open as the concrete examples, because it runs strongly towards the long-flowering end of the category and that is where the vocabulary matter most; the meanings though hold to any sativa seed from any seller. They are given in no special order, since not one of them makes sense without the rest.
Landrace
A population of plants adapted through centuries to one place by the local climate and climate together, rather than by modern breeding. Thai, Colombian, Malawian and Oaxacan stock are the classic sativa examples. A landrace is variable, rather than a one plant: within a pack the flowering times, finishing times and aromas range far more than in any tent-bred line, and that variation is the whole value of keeping one.
The trap is treating a landrace as a finished product. It carries traits that made sense in an equatorial field, such as a frame no tent can contain and a flowering rhythm tuned to an daylength the majority of growers never offer. “Heirloom” in a listing generally refers to a landrace that has been reproduced somewhere for a number of generations, typically with light selection for tent conditions; it is nearer to manageable but still far from uniform. A seller offering “landrace” that does not give a origin region and a reproduction history is using the word as a flavour, and the pack should be judged accordingly.
Latitude (outdoor sativas)
The one number that decides whether a sativa can ripen outdoors, and one no pack states. Equatorial plants require the autumn days to go on late enough for the plant to ripen; at high latitudes the frost arrives first, and the grower harvests a half-finished plant in late October or else watches it to mould in November. The closer south, in a northern hemisphere, the later the window runs, and coastal and low-latitude gardens are able to ripen plants that temperate gardens cannot.
The usable reading of a seed pack: an “outdoor” sativa finishing month is stated for the breeder’s own latitude, normally a point in southern Europe or the western United States, and every degree further north of that moves the date back into the weather. A grower above roughly the fiftieth parallel who wants a long-flowering sativa in the garden is looking for a sativa autoflower or else a greenhouse, and not a longer season.
Flowering time
The number of weeks from the start of flowering and harvest, and the one most misunderstood figure on a sativa pack. With photoperiod seed it is measured from the day the light drops to twelve hours, rather than from sowing, so a “fourteen-week” sativa grown after a ordinary vegetative stage is a twenty-two-week plant. Breeders additionally quote the shorter end of a spread, because the longer end moves less seed.
Long-flowering lines run anywhere from ten weeks to more than twenty, and the longest line in the Haze Sativa Seeds range comes in at around 16 weeks after the flip. The catalogue can be filtered by this number, which is a sensible first pass if you have a grower on a fixed schedule. A grower who adds four weeks on top of whatever the pack states is seldom disappointed.
Equatorial
Describes lines from latitudes where daylength hardly changes across the year, which means where the plant does not develop a strong reaction to changing days. Such plants often flower reluctantly at a conventional twelve-hour schedule, since twelve hours is, to them, a mild ordinary day and not a signal.
The practical fix, passed around among sativa growers over decades, is to cut the light more: eleven hours, sometimes ten, especially during the last weeks. It costs a little yield and gains an earlier clearer end. A listing that uses “equatorial” is warning you this with one word, and a grower who reads it as a note on geography has missed the instruction hidden in it.
Foxtailing (and when it is not a fault)
The tendency of some flowers to push out new bud clusters on top of existing ones, producing spired, irregular buds instead of dense ones. In the majority of tent-bred strains it is a stress symptom, typically caused by light too close or temperatures too high, and the advice is to correct the room.
In many sativas, above all Southeast Asian and some Haze hybrids, it is genetic and will occur in a perfect room. A new sativa grower frequently wastes weeks chasing a fault that is there, lowering lights and heat and slowing an already long plant even more. The listing rarely warns which type you should expect; the lineage usually tells you.
Hermaphroditism in long-flowering lines
The production of male flowers on a female plant, typically towards the end in flower and frequently in response to stress. Every cannabis line carries some tendency for it; sativa plants express it more, for one simple one: fourteen weeks of flower is sixteen weeks of exposure for a light leak, a temperature spike or a missed watering that can set it going, and a old that has waited past its intended finish often produces a few desperate pollen flowers on its own as a final effort to make seed.
None of these means a sativa strain weak by nature; it means the grower’s discipline matter for a longer stretch. A sealed tents, stable temperatures and cutting the moment the plant is done and not two weeks later remove the greater part of the risk. A listing which mentions a breeder screens parents for intersex traits is worth worth hearing for a sativa than for any else.
Sativa-dominant
A catalogue term and not a measurable one. The phrase usually indicates that the larger share of a hybrid’s parents were described as sativa according to the breeder who wrote the listing, which sometimes means nothing more than that the flowers are longer or the aroma sharper than the same breeder’s indica-labelled lines.
The experience people connect with the word, lively rather than heavy, is governed more by terpene profile and the THC balance than by the sativa fraction, and a good number of “sativa-dominant” hybrids produce a heavy couch result while plenty of the opposite lines deliver exactly the opposite. To a buyer the percentage is worth something as a rough guide to growth habit, flowering time and stretch; for a guide to how it feels it is close to useless without the terpene description.
Terpinolene (the “sativa smell”)
A aromatic compound found in large proportion in a lot of old sativa lines and responsible for much of the thing people mean as a “sativa” smell: fresh, woody, citrus and faintly sweet at once. It is volatile, driven off quickly by fast drying, and it fades more quickly in storage than the heavier terpenes which lead most tent lines.
To a seed buyer the word earns two jobs. When a listing names terpinolene among the lead aromas, the strain most likely has real old-sativa ancestry regardless of what the label claims. And where the grower are after that smell to survive by the jar, the drying is going to be cool and slow; a warm dry turns a terpinolene sativa into something that tastes of very little and nothing of what the pack described.
Stretch (the doubling)
The surge of vertical growth which comes after the change to flowering. Indica-leaning plants add around half their height again; sativas routinely double, and some equatorial lines go further. The stretch continues two to five weeks and cannot be halted once it has started, only redirected by training.
In tent terms, a stretch multiplier is a fact worth reading ahead of deciding when to switch. A sativa flipped at sixty centimetres inside a two-metre tent is at the lamp before week four of flower; one switched at thirty centimetres has room. Growers coming over from indica stock nearly always flip too late the first time, and the consequence is visible on the ceiling of the tent.