Sativa seeds come with more jargon attached 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 trying to make a decision in front of the pack. The disappointing sativa grow usually goes back to a word that was understood in the wrong sense: a flowering time taken as a promise, a “sativa-dominant” tag taken as a statement of effect, a landrace chosen as if it were a tent-bred hybrid. The entries below were written with the range at https://hazesativaseeds.com open for reference, because it runs heavily towards the classic end of the category where the vocabulary matter most; the definitions though apply to any sativa seed from any seller. They are given in no special order, because none of them makes usable on its own without the others.
Hermaphroditism in long-flowering lines
The appearance of pollen-bearing flowers on a female plant, usually towards the end in flower and often under stress. Every cannabis line has a degree of tendency to it; sativa lines express it more often, and the reason is one plain one: fourteen weeks of flower is fourteen weeks of opportunity for a timer leak, a temperature spike or a missed watering to trigger it going, and an old plant has already waited beyond its natural finish often produces a few late male flowers on its own in a last attempt to set seed.
None of this means a sativa line weak by course; it makes the room’s consistency count for a longer stretch. A sealed tents, steady conditions and harvesting the moment the plant is ready and not a week after take away most of the risk. A listing which states a breeder tests parents for intersex tendency is worth more for a long-flowering line than on any else.
Terpinolene (the “sativa smell”)
A terpene found in high amounts in a lot of old sativa lines and responsible for most of the thing people mean as the “sativa” aroma: fresh, woody, lemon and slightly sweet all at once. It is fragile, driven off easily by fast drying, and it degrades more quickly during storage than the heavier terpenes that dominate most tent lines.
To a seed buyer the word does two things. When a listing names terpinolene as the lead aromas, the strain most likely carries real Haze-era ancestry whatever the label claims. And when the you wants that smell to survive to the jar, the drying is going to be cool and slow; a fast drying room flattens a terpinolene line into a flower that tastes of very little and leaves nothing of what the pack described.
Equatorial
Describes plants out of latitudes where daylength hardly changes across the year, which means that the plant does not develop a strong reaction to shortening days. Such plants frequently flower slowly at a conventional twelve-hour light cycle, since twelve hours is, for them, an unremarkable day and not a signal.
The practical response, handed around between sativa growers for decades, is to shorten the light further: eleven hours, occasionally ten, particularly during the final weeks. It loses a yield yield and buys an earlier clearer finish. A listing which says “equatorial” is warning you this in one word, and a grower that takes it as a note on geography misses the instruction inside it.
Haze (the family, not the smell)
In its first sense a specific family of plants bred in 1970s California from Mexican, Thai and South Indian parents, and then kept and worked in the Netherlands. A true Haze runs tall, fills out sparsely, flowers for twelve to sixteen weeks and carries a scent of incense, pine and something metallic that no other line quite has.
In its second sense “Haze” is any hybrid that contains some of that family, which by now is most of the sativa-leaning catalogue. A listing that says “Haze” without lineage may be mostly percent the old family or one 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 through which parent”.
Sativa-dominant
The catalogue term rather than a botanical one. The phrase usually indicates that the larger share of a hybrid’s lineage are described as sativa according to the breeder who drafted the listing, which occasionally signals nothing more than that the flowers are airier or the smell sharper than the same breeder’s indica-labelled releases.
The effect people associate with a word, clear-headed instead of heavy, is governed far more by terpene profile and by THC balance than by ancestry, and plenty of “sativa-dominant” releases deliver a flat sleepy effect while a good number of the opposite stock deliver exactly the opposite. To a grower the label is useful for a loose hint to growth habit, flowering time and stretch; for a predictor to how it feels it is close to worthless without the terpene description.
Latitude (outdoor sativas)
The one figure that decides if a sativa can ripen outdoors, and a number that no pack prints. Equatorial lines need a autumn days to continue late enough for the plant to finish; at high latitudes the frost comes first, and the grower cuts a unripe plant in the end of October or else watches it to mould in November. The further south, within a northern hemisphere, the later the window stretches, and coastal or subtropical gardens are able to ripen plants that temperate growers cannot.
The practical rule of a seed pack: an “outdoor” sativa finishing date is stated for the breeder’s own latitude, usually somewhere within southern Europe or the west coast of the United States, and each degree north of that pushes the finish later towards the weather. A grower north of about the fiftieth parallel who is after a true sativa in the garden needs to be looking for an autoflower or a greenhouse, and not a better summer.
Foxtailing (and when it is not a fault)
The tendency of some flowers to push out new bud growth on top of old ones, producing spired, irregular buds rather than round ones. In most tent-bred strains it is a heat symptom, usually from light that is too close or temperatures that is too high, and the advice is to correct the room.
In a good number of sativas, especially Thai and certain Haze hybrids, it is genetic and is going to occur in a flawless room. A first-time sativa grower often spends weeks hunting a problem that is a problem, lowering lights and temperatures only delaying an already long flower even more. The listing seldom warns which kind to expect; the lineage usually does.
Flowering time
The number of weeks from the onset of flowering and maturity, which is the single most frequently misunderstood number on a sativa pack. For photoperiod seed it is measured from the day the light drops to twelve hours, rather than from germination, so a “fourteen-week” sativa grown with an eight-week vegetative period is a twenty-two-week plant. Seed companies also quote the optimistic end of a range, since the longer end sells less seed.
Sativa plants take everywhere from ten weeks to well over 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 figure, which is a reasonable first step if you have a room with a fixed schedule. A grower who adds four weeks to the figure the pack says is rarely disappointed.
Stretch (the doubling)
The surge of vertical growth that follows the change to flowering. Most tent-bred plants gain around half their height again; sativas routinely double, and a few equatorial lines triple. The stretch lasts three to five weeks and cannot be halted once it begins, merely bent sideways by training.
In tent terms, a stretch figure is a number to reading before choosing when to flip. A sativa switched at sixty centimetres centimetres in a two-metre tent is at the lamp by week four of flower; one flipped at thirty centimetres centimetres has room. People coming over from indica strains almost always switch too late the first time, and the consequence is visible on the ceiling of the tent.
Landrace
A population of plants adapted through generations to one place by local growers and growers together, rather than by deliberate breeding. Thai, Thai, Malawian and Mexican stock are the sativa examples. A landrace is variable, not a one plant: within a pack the flowering times, finishing times and aromas spread widely than in any tent-bred hybrid, and this variation is the whole value of growing one.
The trap is treating a landrace like a modern product. It brings habits that made sense in an equatorial field, including a frame that no tent can contain and a flowering rhythm tuned to a daylength the majority of growers cannot provide. “Heirloom” in a listing generally refers to a landrace that has been grown out somewhere for some generations, typically with light selection for indoor life; it is nearer to usable but still not uniform. A shop listing “landrace” that does not give an collection point and a generation history is applying the word as a flavour, and the pack should be priced accordingly.