Sativa seeds come with more vocabulary around them than any other kind of cannabis seed, and most of it means one thing to a botanist, another to a breeder and something different again to the grower standing in front of the listing. A disappointing sativa grow usually traces back to a word that was understood in the wrong sense: a flowering time read as a fixed number, a “sativa-dominant” label taken as a description of character, a landrace bought as if it were a tent-bred hybrid. The entries below are written with the range at https://hazesativaseeds.com to hand for reference, since it leans heavily towards the classic end of the spectrum and that is where the words carry the most weight most; the definitions though apply to any sativa seed from any seller. They are in no particular order, because not one of them is sense on its own without the rest.
Haze (the family, not the smell)
Originally a particular line of plants put together in coastal California from Mexican, Thai and South Indian landraces, and later preserved and refined in the Netherlands. A true Haze grows tall, fills out sparsely, takes for twelve to sixteen weeks and smells of incense, pine and something sharp that no other other line exactly has.
In its looser sense “Haze” is any cross that contains some of that family, and today is a great many of the sativa-leaning market. A listing that says “Haze” and gives no parents may be eighty percent original old family or one small fraction of it, and the flowering character tracks the fraction, not the name. The useful question is never “is it a Haze” but “how much, and through which parent”.
Foxtailing (and when it is not a fault)
The habit of some flowers to push out new bud growth on top of existing ones, giving spired, irregular buds rather than dense ones. In most tent-bred lines it is a heat response, usually caused by light too close or a room too high, and the standard response is to fix the room.
In a good number of sativas, above all Thai and some Haze hybrids, it is built in and will happen in a perfect room. A new sativa grower frequently wastes a month hunting a problem that is a problem, dropping lights and heat only slowing a slow plant even more. The listing seldom says which type you should expect; the lineage generally does.
Latitude (outdoor sativas)
The one figure that decides if a sativa can finish outdoors, and one no pack states. Equatorial lines need a run of shortening days to go on long enough to let the plant to ripen; in northern latitudes the frost comes first, and the grower cuts an unripe plant in late October or loses it to mould in November. A closer to the equator, in a northern hemisphere, the longer the season stretches, and Mediterranean and low-latitude gardens can ripen lines that northern growers never will.
The usable reading of a seed listing: an “outdoor” sativa finishing date is given for the breeder’s home latitude, usually somewhere in temperate Europe or the western United States, and every step north of that pushes the date back towards the frost. A grower north of about the fiftieth parallel who wants a true sativa in the garden is looking for a sativa autoflower or a covered space, not a longer season.
Flowering time (and what it is counted from)
The figure of weeks from the start of flowering and maturity, and 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 grown with an eight-week vegetative period is a five-month plant. Breeders also quote the shorter end of the spread, since the other end sells fewer seed.
Long-flowering lines take everywhere from ten weeks to more than twenty, and the longest line in the Haze Sativa Seeds range is at around 16 weeks after the flip. The catalogue can be filtered by this figure, which is the reasonable first pass for a grower on a tight schedule. A grower who allows four weeks to whatever the pack says is seldom disappointed.
Intersex tendency
The production of male flowers on a female plant, typically towards the end in flower and frequently under stress. Every cannabis line has a degree of capacity to it; sativa plants express it more, and the reason is a simple reason: sixteen weeks of flower is sixteen weeks of exposure for a timer leak, a temperature spike or a missed watering to set it going, and an old that has already waited past its intended end often throws a few desperate pollen flowers on its own in a last attempt to make seed.
None of these means a sativa line weak as a matter of nature; it means the room’s discipline count over longer. Light-tight room, stable conditions and harvesting when the plant is done and not two week after remove most of the problem. A listing which states the breeder screens parents for hermaphrodite traits is worth more for a sativa than for any else.
Stretch (the doubling)
The burst of vertical growth that comes after the switch to flowering. Most tent-bred plants gain around half again; sativas routinely double, and some equatorial lines go further. The stretch continues two to four weeks and cannot be stopped once it has started, merely bent sideways by training.
In practical terms, the stretch multiplier is the fact to reading before choosing when to flip. A sativa switched at sixty centimetres centimetres inside a two-metre tent is at the lamp before week four of flower; one flipped at thirty centimetres has room. Growers coming over from indica stock nearly always switch far too late the first time, and the consequence is written on the ceiling of the tent.
Sativa-dominant (the label)
A marketing term and not a measurable one. The phrase generally means that the larger share of a hybrid’s parents are classed as sativa by whoever drafted the listing, and occasionally means nothing more than that the flowers are longer or the smell brighter than the that breeder’s other lines.
The effect people connect with the word, clear-headed instead of sedating, is driven far more by terpene profile and the THC balance than by the sativa fraction, and plenty of “sativa-dominant” hybrids deliver a flat couch result and plenty of the opposite stock deliver the opposite. For a buyer the label is worth something as a loose guide to growth habit, flowering time and stretch; as a predictor to how it feels it is close to useless unless accompanied by the terpene description.
Landrace
A population of plants adapted through generations to a particular place by the local climate and climate alike, rather than by modern breeding. Thai, Thai, Malawian and Oaxacan stock are the classic sativa examples. A landrace is variable, rather than a single plant: inside a pack the heights, finishing times and smells range widely than in a tent-bred line, and that spread is the whole value of keeping one.
The trap is treating a landrace as a finished product. It carries traits that made sense in an equatorial field, including height that no tent can hold and a flowering rhythm set to a equatorial daylength most growers cannot provide. “Heirloom” on a listing usually refers to a landrace that has been grown out somewhere for a number of generations, often with a degree of selection towards indoor conditions; it is closer to manageable but still not a hybrid. A seller offering “landrace” without an collection point and a reproduction count is applying the word loosely, and the seeds should be judged with that in mind.
Equatorial (the twelve-hour problem)
Describes plants from regions where daylength barely varies across the year, which means where the plant never evolved a strong response to shortening days. Such plants frequently flower reluctantly at a conventional twelve-hour light cycle, since twelve hours is, for them, an ordinary day rather than a signal.
The practical fix, passed down among sativa growers for decades, is to cut the light more: eleven hours, occasionally ten, particularly during the last weeks. It costs some yield yield and buys an more decisive end. A listing which says “equatorial” is warning you this with one word, and a grower who reads it as mere geography has missed the point inside it.
Terpinolene
A aromatic compound found in large proportion in a lot of old sativa lines and accounting for much of the thing people describe as a “sativa” aroma: green, piney, lemon and faintly floral at once. It is volatile, driven off easily by fast drying, and it fades faster during storage than the heavier terpenes which lead most tent lines.
For a seed buyer the name earns two things. Where a listing lists terpinolene among the leading aromas, the line most likely has substantial Haze-era ancestry whatever the label claims. And when the grower wants that profile to survive to the jar, the cure has to be cool and slow; a fast drying room turns a terpinolene sativa into something that tastes of very little and leaves no trace of what the pack promised.