Sativa seeds come with more vocabulary attached 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 pack. The failed sativa grow nearly always goes back to a word that was understood in the wrong sense: a flowering time read as a promise, a “sativa-dominant” tag read 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 to hand as reference, because it runs strongly to the classic end of the spectrum and that is where the vocabulary matter most; the meanings though hold to any sativa seed from any seller. They are given in no particular order, because not one of them is sense on its own without the rest.
Haze
Originally a particular line of plants put together in coastal California from Colombian, Thai and Thai parents, and later preserved and worked in the Netherlands. A true Haze grows tall, fills out openly, takes for twelve to sixteen weeks and smells of incense, pine and something metallic that no other line exactly has.
In its looser sense “Haze” is whatever hybrid which contains a share of that family, which by now is a great many of the sativa-leaning catalogue. A listing that says “Haze” and gives no parents may be mostly percent original classic family or a small fraction 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”.
Landrace versus heirloom
A population of plants adapted over centuries to one region by local climate and climate together, and not by modern breeding. Thai, Thai, Malawian and Oaxacan lines are the classic sativa examples. A landrace is a spread, rather than a one plant: within a pack the flowering times, finishing times and smells spread widely than a tent-bred hybrid, and this variation is the whole value of keeping one.
The mistake is buying a landrace as a modern hybrid. It brings traits that made sense in an open field, such as a frame no tent can contain and a flowering clock tuned to an daylength most growers never offer. “Heirloom” in a listing usually means a landrace that has been reproduced somewhere for some generations, often with light selection towards tent life; it is nearer to manageable but still not a hybrid. A seller listing “landrace” without an origin point and a reproduction count is applying the word loosely, and the pack should be judged with that in mind.
Hermaphroditism in long-flowering lines
The production of male flowers on a female plant, typically late in flower and often under stress. Every cannabis population has a degree of tendency for do; sativa plants show it more, and the reason is a simple one: sixteen weeks of flower is sixteen weeks of opportunity for a timer leak, a temperature spike or a late watering that can set it going, and an plant that has already waited past its natural end frequently produces a few late male flowers on its own as a last effort to make seed.
None of these makes a sativa strain unstable by nature; it makes the room’s consistency count for longer. A sealed room, stable conditions and cutting the moment the plant is ready rather than a week later remove most of the risk. A listing that states a breeder screens parents for intersex traits is saying something worth hearing for a long-flowering line than for anything other category.
Equatorial (the twelve-hour problem)
Refers to lines out of regions in which daylength hardly changes across the year, and where the plant never develop a strong response to changing days. These plants frequently start flowering slowly under a standard twelve-hour light cycle, since twelve hours is, to them, an unremarkable day rather than a signal.
The practical fix, handed around among sativa growers for decades, is to shorten the light more: eleven hours, occasionally ten, especially during the last weeks. It loses some little yield and gains an earlier decisive finish. A listing which uses “equatorial” is warning you about this in one word, and a grower that reads it as mere geography has missed the point inside it.
Flowering time
The figure of weeks between the start of flowering and maturity, and the single most frequently misread figure on a sativa pack. With photoperiod seed it is counted from the day the light drops to twelve hours, not from germination, so a “fourteen-week” sativa started after a ordinary vegetative period is a twenty-two-week plant. Seed companies additionally give the shorter end of the range, since the longer end sells fewer seed.
Long-flowering lines take everywhere from ten weeks to well over 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 number, which is the sensible first step if you have a grower on a tight schedule. A grower who allows four weeks on top of the figure the pack says is seldom caught out.
Terpinolene (the “sativa smell”)
A aromatic compound found in large amounts in many old sativa lines and responsible for much of what people describe as a “sativa” smell: green, woody, lemon and slightly sweet all at once. It is volatile, lost easily through hot drying, and it fades faster during the cure than the earthier terpenes which lead most tent lines.
To a seed buyer the word earns two jobs. Where a listing lists terpinolene as the leading terpene, the line probably carries substantial old-sativa genetics regardless of what the percentage claims. And when the you are after that profile to survive by the jar, the cure has to be slow and cool; a fast dry flattens a terpinolene sativa to a flower that smells of hay and leaves nothing of what the pack described.
Stretch (the doubling)
The surge of vertical growth that comes after the switch to flowering. Most tent-bred plants gain half again; sativas commonly double, and a few equatorial types go further. The stretch lasts two to five weeks and cannot be halted after it begins, only bent sideways by training.
In practical terms, the stretch figure is the number worth read before deciding when to flip. A sativa switched at sixty centimetres in a standard tent is touching the lamp by week four of flower; one switched at thirty centimetres has room. Growers coming over from indica stock nearly always switch too late the first time, and the lesson is visible on the ceiling of the tent.
Latitude (outdoor sativas)
The single figure that decides whether a sativa will finish outdoors, and one no pack prints. Long-flowering plants require the run of shortening days to go on long enough for the plant finish; at northern latitudes the frost arrives first, and the grower harvests an half-finished plant in late October or else watches it rot in November. A closer to the equator, within a northern hemisphere, the longer the window runs, and coastal or low-latitude gardens are able to finish lines that temperate gardens cannot.
The usable reading of a seed listing: an “outdoor” sativa harvest date is stated for the breeder’s home latitude, usually a point within temperate Europe or the west coast of the United States, and every degree north of it pushes the date back into the weather. A grower above roughly the fiftieth parallel who is after a true sativa outdoors is looking for a sativa autoflower or else a greenhouse, and not a better summer.
Foxtailing
The tendency of some flowers to push out fresh bud growth on top of existing ones, producing towered, open buds instead of dense ones. In most tent-bred strains it is a heat symptom, typically from light too close or temperatures too high, and the advice is to fix the cause.
In many sativas, above all Southeast Asian and certain Haze lines, it is genetic and will happen under a flawless room. A first-time sativa grower frequently spends weeks hunting a fault that is a problem, dropping lights and heat only delaying a long plant even more. The breeder seldom says which type to expect; the parentage usually does.