Sativa seeds arrive with more jargon attached than any other kind 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. The failed sativa grow usually goes back to a word that was understood in the wrong sense: a flowering time read as a fixed number, a “sativa-dominant” tag taken as a description 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 to hand for the concrete examples, since it leans strongly towards the classic end of the category and that is where the vocabulary carry the most weight most; the meanings though hold to any sativa seed from any seller. They are in no particular order, because not one of them makes sense on its own without the rest.
Foxtailing (and when it is not a fault)
The tendency of some flowers to grow fresh calyx growth on top of old ones, giving spired, open buds rather than round ones. In the majority of indica-leaning strains it is a heat symptom, typically from light too close or a room too high, and the advice is to fix the cause.
In a good number of sativas, especially Thai and certain Haze lines, it is genetic and is going to occur under a flawless room. A first-time sativa grower often spends a month chasing a fault that is not there, lowering lights and heat and delaying an already long flower further. The listing rarely says which type to expect; the parentage usually does.
Latitude (outdoor sativas)
The single figure that determines if a sativa will finish outdoors, and one no pack prints. Equatorial plants need a run of shortening days to continue late enough for the plant to ripen; at high latitudes the frost arrives before that, and the grower harvests an unripe plant in late October or else watches it rot in November. The closer south, within the northern hemisphere, the later the season stretches, and coastal and low-latitude growers can finish lines that northern growers cannot.
The usable rule of a seed pack: an “outdoor” line harvest date is stated for the breeder’s home latitude, normally a point within temperate Europe or the western United States, and each degree north of that moves the finish later into the weather. A grower above roughly the fiftieth parallel who is after a long-flowering sativa in the garden needs to be shopping for an autoflower or a covered space, and not a longer summer.
Terpinolene (the “sativa smell”)
A aromatic compound found in high amounts in many old sativa strains and responsible for most of what growers describe as a “sativa” aroma: fresh, piney, lemon and slightly floral all at once. It is fragile, lost quickly through fast drying, and it degrades faster during storage than the heavier terpenes which dominate most tent stock.
To a seed buyer the name does two jobs. Where a listing names terpinolene as the leading terpene, the line most likely has substantial old-sativa ancestry regardless of what the percentage says. And where the grower are after that smell to survive by the jar, the drying has to be slow and cool; a fast drying room turns a terpinolene sativa into a flower that tastes of very little and leaves nothing of what the pack described.
Flowering time (and what it is counted from)
The figure of weeks from the start 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, not from germination, so a “fourteen-week” sativa started after an eight-week vegetative period is a five-month plant. Breeders also give the optimistic end of the range, since the other end moves less seed.
Sativa plants take 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 sorted by this number, which is the reasonable first step if you have a grower with a tight schedule. A grower who allows four weeks on top of whatever the pack says is seldom caught out.
Sativa-dominant
A marketing term rather than a measurable one. It generally indicates that the larger share of a hybrid’s parents were classed as sativa by whoever wrote the listing, and sometimes means no more than a certain the buds are airier or the aroma sharper than the same breeder’s other releases.
The effect people associate with the word, lively instead of heavy, is driven far more by terpene profile and the THC content than it is by ancestry, and a good number of “sativa-dominant” hybrids produce a flat couch result while plenty of indica-labelled stock do the opposite. For a grower the label is useful as a rough hint to growth habit, flowering time and stretch; as a guide to effect it is next to worthless without the aroma description.
Equatorial
Describes plants from regions where daylength barely changes through the year, which means where the plant never evolved a strong reaction to shortening days. These plants frequently start flowering reluctantly under a standard twelve-hour schedule, because twelve hours is, to them, an ordinary day and not a signal.
The practical response, handed down among sativa growers for decades, is to cut the light more: eleven hours, occasionally ten, especially during the final weeks. It loses a little yield and gains an more decisive end. A listing that says “equatorial” is warning you about this with one word, and a grower that takes it as mere geography misses the instruction inside it.
Stretch
The burst of vertical growth which comes after the switch to flowering. Most tent-bred plants gain half their height again; sativas routinely double, and a few equatorial lines go further. The stretch lasts two to five weeks and cannot be halted after it begins, merely redirected by training.
In practical terms, a stretch figure is a fact to reading ahead of choosing when to switch. A sativa flipped at sixty centimetres in a standard tent is touching the lamp by week four of flower; one switched at thirty centimetres centimetres has room. People moving from indica strains almost always switch too late the first time, and the consequence is visible on the ceiling of the tent.
Hermaphroditism in long-flowering lines
The production of male flowers on a female plant, usually towards the end in flower and often under stress. Almost every cannabis population carries a degree of capacity to it; sativa plants express it more often, and the reason is one plain reason: sixteen weeks of flower is sixteen weeks of exposure for a timer leak, a temperature spike or a late watering that can set it going, and a plant plant has waited beyond its intended end frequently produces a few desperate pollen flowers on its own as a last attempt to make seed.
Not one of these means a sativa strain weak as a matter of course; it means the room’s consistency count over longer. Light-tight tents, steady conditions and cutting when the plant is ready and not two weeks later take away the greater part of the risk. A listing that states the breeder tests parents for hermaphrodite traits is saying something more for a long-flowering line than for anything else.
Landrace
A population of plants shaped through centuries to a particular region by local climate and climate together, rather than by deliberate breeding. Colombian, Colombian, Congolese and Mexican lines are the sativa cases. A landrace is a spread, rather than a one plant: inside a pack the heights, finishing times and aromas range far more than in a tent-bred hybrid, and that variation is the point of keeping one.
The trap is treating a landrace like a modern product. It brings habits that make sense in an open field, such as height no tent can hold and a flowering clock set to a equatorial daylength most growers cannot offer. “Heirloom” on a listing generally means a landrace that has been reproduced somewhere for a number of generations, typically with a degree of selection for indoor life; it is closer to manageable but nonetheless far from a hybrid. A seller offering “landrace” without an origin region and a generation history is using the word as a flavour, and the pack should be judged accordingly.