Sativa seeds arrive with more vocabulary attached than any other kind of cannabis seed, and a good deal of it says one thing to a botanist, another to a seed company and something different again to the person standing in front of the listing. The disappointing sativa grow nearly always traces back to a word that was understood in the wrong sense: a flowering time read as a fixed number, a “sativa-dominant” tag read as a description of effect, a landrace bought like it were a tent-bred hybrid. The entries below were written with the range at https://hazesativaseeds.com open as reference, because it leans strongly to the long-flowering end of the spectrum where the vocabulary matter most; the definitions themselves hold to any sativa seed from any seller. They are given in no particular order, since none of them makes sense without the others.
Landrace
A population of plants shaped through generations to one place by local growers and climate together, rather than by modern breeding. Thai, Colombian, Malawian and Oaxacan lines are the classic sativa cases. A landrace is variable, not a single plant: inside a pack the flowering times, flowering times and aromas range widely than a tent-bred hybrid, and that spread is the whole value of growing one.
The trap is treating a landrace like a finished product. It brings traits that made sense in an open field, including a frame no tent can contain and a flowering clock tuned to an equatorial daylength the majority of growers cannot provide. “Heirloom” on a listing usually means a landrace that has been reproduced somewhere for some generations, often with a degree of selection towards tent conditions; it is nearer to usable but nonetheless far from a hybrid. A shop listing “landrace” that does not give a collection point and a generation count is applying the word as a flavour, and the seeds should be priced accordingly.
Flowering time
The number of weeks from the start of flowering and harvest, which is the single most misread figure on a sativa pack. With photoperiod seed it is measured from the day the light is cut to twelve hours, rather than from sowing, so a “fourteen-week” sativa grown with a eight-week vegetative period is a five-month plant. Seed companies also quote the shorter end of a spread, because the longer end sells fewer seed.
Long-flowering lines take anywhere from ten weeks to well over twenty, and the longest strain in the Haze Sativa Seeds range is at around 16 weeks after the flip. The catalogue can be sorted by this figure, which is the sensible first pass if you have a grower with a tight timetable. A grower who allows four weeks to the figure the pack says is rarely caught out.
Equatorial (the twelve-hour problem)
Describes lines from regions where daylength hardly varies across the year, and that the plant does not develop a strong reaction to changing days. These plants often start flowering reluctantly at a standard twelve-hour schedule, since twelve hours is, for them, a mild unremarkable day and not a signal.
The practical response, handed around between sativa growers for decades, is to cut the light further: eleven hours, sometimes ten, especially in the last weeks. It costs a little yield and gains a earlier clearer finish. A listing which uses “equatorial” is telling you this with one word, and a grower that reads it as mere origin misses the point inside it.
Haze
Originally a particular line of plants put together in 1970s California from Mexican, Colombian and South Indian landraces, and later preserved and worked in the Netherlands. A true Haze runs tall, branches sparsely, takes for twelve to sixteen weeks and smells of incense, pine and a note sharp that no other line quite has.
In its second sense “Haze” is whatever hybrid that contains some of that family, and by now is most of the sativa-leaning market. A listing which says “Haze” without parents may be eighty percent original classic family or a sixteenth of it, and the grow character tracks the share, not the name. The useful question is not “is it a Haze” but “how much, and through which parent”.
Stretch (the doubling)
The burst of vertical growth that follows the change to flowering. Most tent-bred plants gain around half their height again; sativas routinely double, and some landrace lines triple. The stretch continues three to four weeks and will not be stopped once it has started, only redirected by training.
In tent terms, the stretch figure is the number worth reading ahead of deciding when to switch. A sativa flipped at sixty centimetres centimetres inside a standard tent is touching the lamp by week four of flower; one flipped at thirty centimetres has room. People moving from indica stock nearly always switch too late the first time, and the consequence is written on the ceiling of the tent.
Foxtailing
The habit of certain flowers to push out fresh calyx clusters on top of old ones, producing towered, open buds instead of round ones. In most tent-bred lines it is a stress response, typically caused by light too close or temperatures too high, and the standard response is to fix the room.
In many sativas, especially Southeast Asian and certain Haze hybrids, it is built in and is going to occur in a perfect room. A new sativa grower frequently spends a month chasing a problem that was never there, lowering lights and temperatures only delaying a slow plant further. The listing seldom says which kind to expect; the lineage generally does.
Intersex tendency
The production of male flowers on a female plant, usually towards the end in flower and frequently in response to stress. Almost every cannabis line carries a degree of tendency for it; long-flowering lines express it more often, and the reason is one plain reason: fourteen weeks of flower is sixteen weeks of exposure for a light leak, a temperature spike or a late watering to set it going, and an old that has already waited beyond its natural finish frequently throws a few desperate pollen sacs on its own in a last effort to make seed.
Not one of this makes a sativa strain unstable by nature; it means the grower’s discipline matter over a longer stretch. A sealed tents, stable temperatures and cutting the moment the plant is ready and not a week after remove the greater part of the risk. A listing which states the breeder tests parents for hermaphrodite traits is worth worth hearing on a sativa than on anything other category.
Latitude
The one number that decides whether a sativa will finish outdoors, and a number no pack states. Long-flowering plants require a run of shortening days to continue long enough for the plant to finish; in high latitudes the frost arrives before that, and the grower harvests an unripe plant in late October or else loses it to mould in November. The closer to the equator, in a northern hemisphere, the longer the window stretches, and Mediterranean or low-latitude gardens can ripen lines that temperate growers never will.
The usable reading for a seed listing: an “outdoor” sativa finishing date is given for the breeder’s own latitude, normally a point in temperate Europe or the western United States, and each degree further north of it moves the date back towards the frost. A grower north of about the fiftieth parallel that wants a true sativa outdoors is looking for an autoflower or a greenhouse, and not a longer season.
Sativa-dominant (the label)
A marketing category rather than a botanical one. The phrase generally means that the larger share of a hybrid’s lineage are described as sativa by the breeder who wrote the description, which occasionally signals nothing more than that the buds are longer or the smell brighter than the that breeder’s other lines.
The experience people connect with a word, clear-headed instead of sedating, is driven more by terpene chemistry and by cannabinoid balance than it is by the sativa fraction, and plenty of “sativa-dominant” releases deliver a flat sleepy effect while a good number of the opposite lines do the opposite. To a buyer the percentage is worth something as a loose guide to growth habit, flowering time and stretch; as a guide to how it feels it is next to useless without the terpene description.