Sativa seeds come with more vocabulary around them than any other category of cannabis seed, and most of it means one thing to a botanist, another to a seed company and a third to the person trying to make a decision in front of the listing. A disappointing sativa grow nearly always traces back to a word that was read in the wrong sense: a flowering time read as a promise, a “sativa-dominant” tag taken as a description of character, a landrace bought like it were a modern hybrid. The entries below are written with the range at https://hazesativaseeds.com open as reference, since it leans strongly to the classic end of the category where the words carry the most weight most; the meanings though hold to any sativa seed from any shop. They are given in no particular order, since none of them is sense without the rest.
Foxtailing (and when it is not a fault)
The tendency of certain flowers to push out new bud clusters on top of old ones, producing towered, irregular buds rather than dense ones. In the majority of tent-bred lines it is a stress symptom, usually from light that is too close or temperatures too high, and the advice is to correct the room.
In a good number of sativas, above all Thai and certain Haze hybrids, it is built in and is going to occur in a flawless room. A first-time sativa grower often wastes weeks hunting a fault that is not a problem, lowering lights and temperatures and delaying a long plant even more. The listing seldom says which type to expect; the parentage generally tells you.
Sativa-dominant (the label)
A marketing term and not a botanical one. It usually indicates that the larger share of a hybrid’s lineage are classed as sativa according to whoever drafted the listing, and occasionally signals no more than that the buds are longer or the aroma sharper than the same breeder’s indica-labelled lines.
The experience people associate with a word, lively instead of sedating, is governed far more by terpene chemistry and the THC content than it is by the sativa fraction, and a good number of “sativa-dominant” hybrids deliver a heavy sleepy effect while plenty of the opposite lines do the opposite. To a grower the label is useful as a rough hint to growth habit, flowering time and stretch; as a predictor to how it feels it is close to worthless unless accompanied by the aroma description.
Haze
In its first sense a particular line of plants bred in coastal California from Mexican, Colombian and Thai parents, and then preserved and worked in the Netherlands. The Haze runs tall, fills out openly, takes for twelve to sixteen weeks and smells of incense, pine and a note sharp that no line exactly reproduces.
In its looser sense “Haze” is whatever hybrid that contains a share of that family, which today is most of the sativa-leaning market. A listing which reads “Haze” and gives no parents may be eighty percent original classic family or a small fraction of it, and the grow time follows the fraction, not the name. The useful question is not “is it a Haze” but “how much, and via which parent”.
Terpinolene (the “sativa smell”)
A terpene found in high proportion in a lot of old sativa lines and accounting for most of what people mean as a “sativa” aroma: green, woody, lemon and faintly sweet at once. It is volatile, lost quickly through fast drying, and it fades faster in storage than the earthier terpenes that dominate indica-leaning stock.
For a seed buyer the name earns two things. Where a listing lists terpinolene as the lead aromas, the line most likely has substantial Haze-era ancestry whatever the percentage claims. And when the grower wants that smell to still be there to the jar, the cure has to be slow and cool; a fast dry flattens a terpinolene sativa to a flower that smells of very little and nothing of what the pack described.
Intersex tendency
The appearance of male flowers on a female plant, typically towards the end in flower and frequently in response to stress. Every cannabis population carries a degree of capacity for it; long-flowering lines express it more often, for one simple one: sixteen weeks of flower is fourteen weeks of exposure for a light leak, a heat spike or a missed watering to set it off, and an plant that has already gone beyond its natural finish often throws a few late male flowers on its own in a last effort to make seed.
Not one of this makes a sativa line weak as a matter of course; it means the room’s consistency matter over a longer stretch. A sealed room, stable conditions and cutting when the plant is ready and not a week after remove the greater part of the problem. A listing that states the breeder screens parents for hermaphrodite tendency is worth more for a long-flowering line than on any other category.
Latitude
The single number that decides whether a sativa can ripen outdoors, and one that no pack prints. Equatorial lines require the run of shortening days to go on late enough for the plant to finish; at northern latitudes the frost arrives first, and the grower harvests an unripe plant in late October or else loses it rot in November. A further to the equator, within a northern hemisphere, the later the season stretches, and Mediterranean and subtropical growers can finish lines that temperate growers cannot.
The practical reading of a seed listing: an “outdoor” sativa finishing date is stated for the breeder’s own latitude, normally a point in southern Europe or the west coast of the United States, and every degree further north of that pushes the date later into the frost. A grower north of about the fiftieth parallel who wants a true sativa in the garden is looking for an autoflower or else a greenhouse, not a longer season.
Flowering time
The figure of weeks between the start of flowering and harvest, which is the single most frequently misunderstood figure on a sativa pack. For photoperiod seed it is measured from the day the light is cut to twelve hours, rather than from germination, so a “fourteen-week” sativa grown with a ordinary vegetative stage is a five-month plant. Breeders additionally quote the optimistic end of the range, because the other end moves fewer seed.
Sativa plants run anywhere from ten weeks to well over twenty, and the slowest strain in the Haze Sativa Seeds range is at around 16 weeks from the switch. The catalogue can be sorted by this figure, which is a sensible first step for a grower on a fixed schedule. A grower who allows four weeks to whatever the pack states is rarely caught out.
Stretch
The surge of vertical growth that comes after the change to flowering. Most tent-bred plants add half again; sativas routinely double, and a few landrace lines triple. The stretch lasts three to five weeks and cannot be halted after it begins, merely bent sideways by training.
In tent terms, a stretch figure is the number to reading before choosing when to flip. A sativa switched at sixty centimetres centimetres inside a standard tent is at the lamp by week four of flower; one flipped at thirty centimetres has room. Growers coming from indica stock almost always flip far too late the first time, and the lesson is written on the ceiling of the tent.
Landrace versus heirloom
A population of plants shaped over centuries to a particular place by the local climate and growers together, rather than by modern selection. Thai, Thai, Malawian and Mexican stock are the sativa cases. A landrace is variable, rather than a single plant: within a pack the flowering times, finishing times and aromas range widely than in a tent-bred line, and this variation is the whole value of keeping one.
The trap is buying a landrace as a finished hybrid. It carries traits that made sense in an open field, including height no tent can contain and a flowering rhythm tuned to a equatorial daylength the majority of growers cannot offer. “Heirloom” in a listing usually refers to a landrace that has been grown out away from its origin over some generations, typically with light selection for indoor life; it is closer to usable but nonetheless far from uniform. A shop offering “landrace” without a origin point and a reproduction history is applying the word loosely, and the seeds should be judged accordingly.
Equatorial (the twelve-hour problem)
Refers to plants out of regions where daylength barely changes across the year, and where the plant never evolved a sharp response to changing days. These plants frequently start flowering slowly under a standard twelve-hour light cycle, because twelve hours is, for them, a mild ordinary day and not a signal.
The working fix, handed down among sativa growers for decades, is to cut the light further: eleven hours, occasionally ten, especially during the last weeks. It costs some little yield and buys a earlier decisive end. A listing that uses “equatorial” is telling you about this in one word, and a grower that takes it as mere origin misses the instruction inside it.