Sativa seeds arrive with more jargon attached than any other category of cannabis seed, and most of it means one thing to a botanist, another to a breeder and a third to the grower standing in front of the listing. A disappointing sativa grow nearly always traces back to a word that was understood in the wrong sense: a flowering time taken as a promise, a “sativa-dominant” label read as a description of effect, a landrace bought like it were a tent-bred hybrid. The entries below were put together with the range at https://hazesativaseeds.com to hand for reference, since it leans heavily towards the classic end of the spectrum where the vocabulary carry the most weight most; the definitions themselves apply to any sativa seed from any seller. They are given in no special order, since none of them is usable without the rest.
Stretch
The surge of vertical growth that follows the switch to flowering. Most tent-bred plants add around half again; sativas commonly double, and a few landrace types triple. The stretch continues two to five weeks and will not be halted after it has started, only bent sideways by training.
In practical terms, a stretch figure is the number worth reading ahead of deciding when to flip. A sativa switched at sixty centimetres centimetres inside a two-metre tent is touching the lamp by week four of flower; one flipped at thirty centimetres centimetres has room. Growers coming over from indica stock nearly always switch too late the first time, and the lesson is written on the ceiling of the tent.
Flowering time
The figure of weeks between the start of flowering and harvest, which is the single most frequently misread figure on a sativa pack. With photoperiod seed it is counted from the day the light is cut to twelve hours, not from germination, so a “fourteen-week” sativa grown after an eight-week vegetative period is a five-month plant. Breeders also give the optimistic end of the spread, because the other end sells fewer seed.
Long-flowering plants take everywhere from ten weeks to more than twenty, and the slowest strain in the Haze Sativa Seeds range is at about 16 weeks after the flip. The catalogue can be filtered by that number, which is a reasonable first step for a room on a tight schedule. A grower who allows four weeks on top of the figure the pack says is rarely caught out.
Haze
Originally a specific family of plants put together in 1970s California from Colombian, Colombian and Thai landraces, and then preserved and worked in the Netherlands. A true Haze grows tall, fills out sparsely, flowers for twelve to to sixteen weeks and carries a scent of spice, pine and a note metallic that no line quite has.
In its looser sense “Haze” is any hybrid that contains some of that family, which by now is a great many of the sativa-leaning catalogue. A listing that reads “Haze” and gives no lineage could be eighty percent original classic family or a small fraction of it, and the grow character tracks the share, not the name. The useful question is never “is it a Haze” but “how much, and via which parent”.
Foxtailing (and when it is not a fault)
The habit of certain flowers to grow new calyx growth on top of old ones, giving towered, open buds instead of dense ones. In the majority of tent-bred lines it is a stress symptom, usually from light that is too close or a room too high, and the advice is to fix the room.
In a good number of sativas, above all Thai and some Haze lines, it is built in and will happen under a perfect room. A new sativa grower frequently wastes a month hunting a fault that was never a problem, lowering lights and heat only delaying a slow plant even more. The breeder rarely warns which kind you should expect; the parentage generally does.
Latitude
The one figure that decides if a sativa will ripen outdoors, and one no pack states. Equatorial plants require a run of shortening days to go on long enough to let the plant ripen; at northern latitudes the frost comes first, and the grower harvests an unripe plant in the end of October or watches it rot in November. A further south, in the northern hemisphere, the later the season runs, and coastal or subtropical gardens are able to ripen lines that temperate growers never will.
The usable rule for a seed listing: an “outdoor” sativa harvest date is given for the breeder’s home latitude, usually somewhere within temperate Europe or the western United States, and each degree north of that pushes the finish back towards the frost. A grower above about the fiftieth parallel who wants a true sativa outdoors needs to be looking for a sativa autoflower or else a greenhouse, and not a longer season.
Sativa-dominant
The catalogue category rather than a measurable one. The phrase generally indicates that more of a hybrid’s parents are classed as sativa according to whoever drafted the description, which occasionally signals nothing more than a certain the flowers are airier or the aroma brighter than the same breeder’s other releases.
The experience people connect with a word, lively rather than heavy, is governed far more by terpene chemistry and the THC content than by ancestry, 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. For a grower the percentage is worth something for a rough hint to growth habit, flowering time and stretch; for a predictor to effect it is close to useless without the terpene description.
Equatorial (the twelve-hour problem)
Describes lines from regions where daylength barely changes across the year, which means that the plant never develop a strong reaction to changing days. Such plants often start flowering reluctantly under a standard twelve-hour light cycle, because twelve hours is, for them, an ordinary day and not a signal.
The practical response, handed down among sativa growers for decades, is to shorten the light more: eleven hours, sometimes ten, particularly in the last weeks. It costs some little yield and gains a earlier clearer finish. A listing that says “equatorial” is warning you about this with one word, and a grower that reads it as mere geography misses the instruction inside it.
Landrace versus heirloom
A population of plants adapted through generations to one place by the local climate and growers alike, rather than by deliberate selection. Thai, Colombian, Congolese and Oaxacan lines are the sativa cases. A landrace is variable, not a one plant: inside a pack the heights, flowering times and aromas range far more than in any tent-bred line, and this variation is the whole value of growing one.
The mistake is buying a landrace as a modern hybrid. It carries traits that made sense in an open field, such as a frame that no tent can hold and a flowering rhythm tuned to a equatorial daylength most growers cannot provide. “Heirloom” in a listing usually refers to a landrace that has been reproduced away from its origin for a number of generations, typically with light selection towards tent life; it is closer to usable but nonetheless far from a hybrid. A shop offering “landrace” without a origin region and a reproduction count is applying the word loosely, and the seeds should be judged accordingly.
Intersex tendency
The appearance of pollen-bearing flowers on a female plant, usually late in flower and frequently in response to stress. Every cannabis population has some tendency to do; long-flowering plants show it more often, and the reason is one simple one: sixteen weeks of flower is sixteen weeks of exposure for a timer leak, a temperature spike or a late watering to trigger it off, and a old that has gone beyond its natural finish often produces a few late pollen sacs on its own in a last attempt to make seed.
None of these means a sativa strain weak as a matter of course; it means the room’s consistency count for longer. Light-tight tents, stable conditions and harvesting the moment the plant is done and not two week later take away most of the risk. A listing which states the breeder tests parents for intersex tendency is saying something worth hearing on a long-flowering line than on anything else.