Sativa seeds arrive with more jargon around them than any other category of cannabis seed, and a good deal of it says a certain thing to a botanist, something else to a seed company and something different again to the grower trying to make a decision in front of the listing. The disappointing sativa grow nearly always goes back to a word that was understood in the wrong sense: a flowering time read as a fixed number, a “sativa-dominant” label read as a description of effect, a landrace chosen as if it were a modern hybrid. The entries below were put together with the range at https://hazesativaseeds.com to hand for the concrete examples, since it runs heavily to the classic end of the spectrum and that is where the words carry the most weight most; the meanings themselves apply to any sativa seed from any shop. They are in no particular order, since none of them is usable on its own without the others.
Hermaphroditism in long-flowering lines
The production of pollen-bearing flowers on a female plant, typically towards the end in flower and often under stress. Almost every cannabis population carries some tendency to it; sativa plants show it more, for a plain reason: sixteen weeks of flower is sixteen weeks of opportunity for a timer leak, a heat spike or a missed watering that can set it going, and an old that has gone beyond its natural end often throws a few desperate pollen sacs on its own as a final attempt to set seed.
None of these makes a sativa strain unstable as a matter of nature; it makes the room’s consistency matter for a longer stretch. A sealed tents, stable conditions and harvesting the moment the plant is done and not two week after take away most of the problem. A listing which states the breeder screens parents for intersex traits is worth worth hearing on a long-flowering line than for anything other category.
Landrace
A population of plants adapted over centuries to a particular region by local climate and growers together, rather than by deliberate breeding. Colombian, Thai, Malawian and Mexican lines are the classic sativa cases. A landrace is a spread, rather than a single plant: inside a pack the heights, flowering times and smells range far more than a tent-bred line, and this spread is the whole value of keeping one.
The mistake is treating a landrace like a modern hybrid. It carries traits that make sense in an equatorial field, including a frame no tent can hold and a flowering rhythm tuned to a equatorial daylength the majority of growers cannot offer. “Heirloom” on a listing usually refers to a landrace that has been reproduced away from its origin over a number of generations, typically with a degree of selection for indoor conditions; it is nearer to usable but nonetheless far from a hybrid. A seller offering “landrace” without a collection region and a reproduction history is using the word as a flavour, and the pack should be judged accordingly.
Terpinolene (the “sativa smell”)
A aromatic compound found in high amounts in many old sativa strains and accounting for most of the thing people describe as the “sativa” aroma: green, woody, lemon and slightly sweet at once. It is volatile, driven off easily by hot drying, and it fades faster during the cure than the earthier terpenes which lead indica-leaning stock.
To a seed buyer the name earns two things. When a listing lists terpinolene as the leading terpene, the strain probably carries substantial Haze-era ancestry whatever the percentage says. And when the grower are after that profile to still be there to the jar, the cure is going to be slow and slow; a warm dry turns a terpinolene line into a flower that tastes of hay and leaves no trace of what the pack promised.
Equatorial (the twelve-hour problem)
Refers to lines out of latitudes in which daylength hardly changes across the year, which means that the plant never develop a strong response to shortening days. These lines often flower reluctantly under a standard twelve-hour light cycle, since twelve hours is, to them, a mild ordinary day and not a signal.
The practical fix, passed down between sativa growers over decades, is to cut the light more: eleven hours, occasionally ten, particularly during the last weeks. It costs a yield yield and buys an earlier clearer end. A listing which says “equatorial” is telling you this with one word, and a grower that reads it as mere geography misses the instruction inside it.
Sativa-dominant (the label)
A catalogue category rather than a measurable one. The phrase usually means that the larger share of a hybrid’s parents are classed as sativa by the breeder who drafted the description, which occasionally means nothing more than a certain the buds are airier or the smell brighter than the same breeder’s other lines.
The effect people connect with a word, lively instead of heavy, is driven far more by terpene chemistry and by cannabinoid content than it is by the sativa fraction, and plenty of “sativa-dominant” hybrids deliver a flat sleepy result and a good number of the opposite lines deliver the reverse. To a grower the percentage is useful for a loose guide to growth habit, flowering time and stretch; for a predictor to how it feels it is close to worthless unless accompanied by the aroma notes.
Haze
In its first sense a particular line of plants bred in 1970s California from Mexican, Thai and Thai landraces, and later preserved and refined in the Netherlands. The Haze grows tall, fills out sparsely, takes for twelve to sixteen weeks and carries a scent of spice, pine and something metallic that no other line exactly reproduces.
In its second sense “Haze” is any cross that carries a share of that family, and by now is most of the sativa-leaning catalogue. A listing which says “Haze” without parents could be eighty percent original old family or a small fraction of it, and the flowering time tracks the fraction, not the name. The useful question is not “is it a Haze” but “how much, and through which parent”.
Foxtailing
The habit of some flowers to push out new calyx growth on top of old ones, producing spired, open buds instead of dense ones. In most indica-leaning strains it is a heat response, typically caused by light too close or a room too high, and the advice is to fix the room.
In many sativas, especially Thai and certain Haze lines, it is genetic and will happen in a flawless room. A first-time sativa grower frequently wastes a month chasing a fault that was never a problem, lowering lights and heat only delaying an already slow plant further. The breeder seldom warns which kind you should expect; the lineage usually does.
Latitude
The single figure that determines whether a sativa will finish outdoors, and one that no pack states. Long-flowering lines require a autumn days to continue long enough for the plant to finish; in high latitudes the frost arrives before that, and the grower cuts an unripe plant in the end of October or else watches it to mould in November. A further south, in the northern hemisphere, the longer the season stretches, and coastal and subtropical gardens can finish plants that northern growers never will.
The practical rule of a seed pack: an “outdoor” line harvest month is stated for the breeder’s own latitude, normally somewhere in temperate Europe or the western United States, and each step further north of it moves the date later towards the frost. A grower above roughly the fiftieth parallel that is after a long-flowering sativa outdoors is looking for a sativa autoflower or a greenhouse, and not a better summer.
Stretch (the doubling)
The burst of upward growth that follows the change to flowering. Indica-leaning plants add around half again; sativas commonly double, and some equatorial types go further. The stretch continues three to four weeks and will not be halted once it begins, merely redirected by training.
In tent terms, the stretch figure is the fact worth reading ahead of choosing when to switch. A sativa flipped at sixty centimetres centimetres inside a two-metre tent is touching the lamp before week four of flower; one flipped at thirty centimetres has room. People moving from indica stock almost always flip too late the first time, and the lesson is written on the ceiling of the tent.