Sativa seeds come with more jargon attached than any other category of cannabis seed, and a good deal of it means a certain thing to a botanist, something else to a seed company and a third to the grower standing in front of the listing. A failed sativa grow nearly always goes back to a word that was understood in the wrong one of those senses: a flowering time taken as a fixed number, a “sativa-dominant” label read as a description of character, a landrace chosen like it were a tent-bred hybrid. The entries below were written with the range at https://hazesativaseeds.com open as reference, because it leans strongly to the classic end of the spectrum where the vocabulary matter most; the definitions themselves hold to any sativa seed from any seller. They are in no particular order, since none of them makes usable on its own without the others.
Landrace versus heirloom
A population of plants shaped through centuries to one region by the local growers and growers together, rather than by modern selection. Thai, Thai, Congolese and Mexican stock are the classic sativa examples. A landrace is variable, not a one plant: within a pack the heights, flowering times and smells range widely than any tent-bred hybrid, and this spread is the whole value of keeping one.
The trap is treating a landrace as a modern hybrid. It carries traits that make sense in an equatorial field, including height that no tent can hold and a flowering clock set to an daylength most growers cannot provide. “Heirloom” in a listing usually means a landrace that has been reproduced somewhere for a number of generations, typically with light selection for indoor conditions; it is nearer to manageable but nonetheless not a hybrid. A seller offering “landrace” without a collection point and a reproduction count is applying the word as a flavour, and the seeds should be priced with that in mind.
Sativa-dominant (the label)
The marketing category rather than a botanical one. It usually means that the larger share of a hybrid’s lineage are described as sativa by whoever wrote the listing, and occasionally signals no more than that the flowers are longer or the smell brighter than the same breeder’s other releases.
The effect people connect with a word, clear-headed instead of sedating, is driven more by terpene chemistry and the THC balance than it is by the sativa fraction, and a good number of “sativa-dominant” releases deliver a flat sleepy result while plenty of the opposite stock deliver the opposite. To a grower the percentage is worth something for a rough hint to growth habit, flowering time and stretch; for a predictor to effect it is next to worthless unless accompanied by the terpene description.
Stretch (the doubling)
The surge of upward growth that comes after the switch to flowering. Indica-leaning plants add half their height again; sativas commonly double, and some equatorial lines go further. The stretch continues three to five weeks and cannot be halted once it begins, only redirected by training.
In tent terms, a stretch multiplier is the fact to read ahead of deciding when to switch. A sativa flipped at sixty centimetres centimetres in a standard tent is at the lamp before week four of flower; one switched at thirty centimetres centimetres has room. People coming from indica stock almost always switch far too late the first time, and the lesson is visible on the ceiling of the tent.
Terpinolene (the “sativa smell”)
A terpene present in large proportion in a lot of old sativa strains and responsible for most of the thing growers mean as a “sativa” aroma: fresh, piney, lemon and faintly sweet all at once. It is volatile, driven off quickly through hot drying, and it degrades more quickly during storage than the heavier terpenes that lead most tent lines.
For a seed buyer the word does two jobs. Where a listing names terpinolene as the lead terpene, the line probably carries substantial Haze-era ancestry whatever the percentage says. And where the grower wants that profile to survive by the jar, the drying is going to be cool and cool; a warm dry turns a terpinolene sativa into a flower that smells of hay and no trace of what the pack promised.
Latitude
The one number that decides whether a sativa can ripen outdoors, and one that no pack states. Long-flowering lines need a autumn days to continue long enough for the plant to ripen; in northern latitudes the frost comes first, and the grower harvests a unripe plant in late October or loses it to mould in November. A further south, in the northern hemisphere, the longer the season stretches, and Mediterranean or subtropical gardens are able to finish plants that northern gardens cannot.
The practical rule for a seed listing: an “outdoor” line finishing date is given for the breeder’s home latitude, usually somewhere within southern Europe or the western United States, and each step north of that moves the finish back into the weather. A grower north of about the fiftieth parallel that is after a long-flowering sativa in the garden needs to be looking for an autoflower or else a covered space, not a better summer.
Equatorial (the twelve-hour problem)
Refers to lines from latitudes in which daylength barely varies through the year, which means where the plant never develop a strong response to changing days. Such lines often start flowering reluctantly at a standard twelve-hour schedule, since twelve hours is, to them, a mild ordinary day rather than a signal.
The practical fix, passed around between sativa growers over decades, is to cut the light further: eleven hours, sometimes ten, particularly during the last weeks. It costs some yield yield and buys an more clearer end. A listing that uses “equatorial” is warning you about this in one word, and a grower who takes it as mere origin has missed the point inside it.
Foxtailing (and when it is not a fault)
The habit of some flowers to grow new bud clusters on top of old ones, producing towered, open buds instead of round ones. In most tent-bred 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 a good number of sativas, above all Southeast Asian and some Haze hybrids, it is genetic and is going to happen under a perfect room. A first-time sativa grower often spends a month chasing a problem that is not a problem, lowering lights and heat only delaying an already long plant further. The breeder seldom says which kind to expect; the lineage usually does.
Hermaphroditism in long-flowering lines
The production of male flowers on a female plant, typically towards the end in flower and frequently in response to stress. Every cannabis line carries a degree of capacity for it; long-flowering plants express it more, for a simple reason: fourteen weeks of flower is sixteen weeks of exposure for a light leak, a temperature spike or a late watering to set it off, and a plant that has already waited beyond its intended end often throws a few desperate pollen sacs on its own as a last attempt to make seed.
None of these makes a sativa strain weak by course; it makes the grower’s discipline matter over longer. A sealed room, steady temperatures and cutting when the plant is ready rather than two week later take away most of the problem. A listing that mentions the breeder screens parents for intersex traits is worth worth hearing on a sativa than for anything else.
Flowering time
The figure of weeks from the start of flowering and maturity, which is the one most frequently misunderstood figure on a sativa pack. For photoperiod seed it is measured from the day the light drops to twelve hours, rather than from sowing, so a “fourteen-week” sativa grown with an eight-week vegetative period is a five-month plant. Seed companies additionally give the shorter end of a spread, since the other end moves fewer seed.
Sativa lines run anywhere from ten weeks to more than twenty, and the slowest line in the Haze Sativa Seeds range comes in at about 16 weeks from the flip. The catalogue can be sorted by that figure, which is the sensible first pass for a room on a fixed timetable. A grower who allows four weeks on top of the figure the pack states is rarely caught out.
Haze
In its first sense a particular family of plants bred in 1970s California from Mexican, Colombian and South Indian parents, and later preserved and worked in the Netherlands. The Haze grows tall, branches sparsely, flowers for twelve to sixteen weeks and carries a scent of incense, pine and a note metallic that no line exactly has.
In its second sense “Haze” is any hybrid which carries a share of that family, and today is most of the sativa-leaning catalogue. A listing which reads “Haze” and gives no lineage could be mostly percent the classic family or one sixteenth of it, and the grow time tracks the fraction, not the name. The working question is never “is it a Haze” but “how much, and via which parent”.