Sativa seeds come with more vocabulary around them than any other category of cannabis seed, and most of it says a certain thing to a botanist, something else to a seed company and something different again to the person trying to make a decision in front of the listing. The failed sativa grow nearly always traces back to a word that was understood in the wrong sense: a flowering time taken as a fixed number, a “sativa-dominant” label read as a statement of character, a landrace bought like it were a modern hybrid. The entries below are written with the range at https://hazesativaseeds.com open as the concrete examples, because it runs strongly to the long-flowering end of the spectrum where the vocabulary matter most; the definitions though hold to any sativa seed from any seller. They are given in no special order, since none of them makes usable on its own without the rest.
Foxtailing (and when it is not a fault)
The tendency of certain flowers to grow fresh bud growth on top of existing ones, producing spired, irregular buds rather than round ones. In most tent-bred lines it is a stress response, usually from light that is too close or a room too high, and the standard response is to fix the cause.
In a good number of sativas, above all Thai and some Haze lines, it is genetic and will occur under a perfect room. A new sativa grower often wastes weeks hunting a fault that is not a problem, lowering lights and temperatures only slowing a slow plant further. The breeder rarely says which type to expect; the lineage generally does.
Haze (the family, not the smell)
Originally a particular line of plants put together in 1970s California from Mexican, Thai and Thai landraces, and then kept and refined in the Netherlands. The Haze runs tall, fills out sparsely, flowers for twelve sixteen weeks and smells of incense, citrus and something metallic that no other line quite has.
In its second sense “Haze” is any hybrid that contains a share of that family, and today is a great many of the sativa-leaning catalogue. A listing which says “Haze” without lineage could be mostly percent the old family or a small fraction of it, and the grow time tracks the share, not the name. The working question is never “is it a Haze” but “how much, and through which parent”.
Flowering time
The figure of weeks between the onset of flowering and harvest, and the one most frequently misread figure on a sativa pack. With 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 a ordinary vegetative stage is a five-month plant. Breeders also give the shorter end of a spread, 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 comes in at around 16 weeks from the flip. The catalogue can be filtered by this figure, which is the sensible first pass for a grower with a tight schedule. A grower who allows four weeks to the figure the pack says is seldom disappointed.
Stretch
The surge of upward growth that follows the switch to flowering. Indica-leaning plants add around half their height again; sativas routinely double, and a few landrace lines go further. The stretch continues two to five weeks and cannot be stopped once it has started, merely redirected by training.
In tent terms, the stretch multiplier is the number worth reading before deciding when to flip. A sativa switched at sixty centimetres centimetres in a two-metre tent is at 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 consequence is visible on the ceiling of the tent.
Terpinolene
A terpene found in high proportion in many old sativa strains and responsible for much of the thing people describe as the “sativa” smell: green, piney, citrus and slightly sweet all at once. It is volatile, driven off quickly through hot drying, and it fades more quickly in the cure than the heavier terpenes which dominate most tent lines.
For a seed buyer the word does two jobs. When a listing lists terpinolene among the leading terpene, the line probably has real Haze-era ancestry whatever the label says. And when the grower are after that profile to survive by the jar, the drying is going to be slow and slow; a warm dry flattens a terpinolene line to something that smells of hay and nothing of what the pack promised.
Intersex tendency
The appearance of pollen-bearing flowers on a female plant, usually late in flower and often in response to stress. Almost every cannabis population carries some tendency to it; sativa lines express it more often, and the reason is a plain reason: sixteen weeks of flower is fourteen weeks of exposure for a light leak, a temperature spike or a late watering that can set it off, and a old that has already waited past its intended finish often produces a few desperate pollen flowers on its own as a final attempt to set seed.
Not one of this means a sativa line weak as a matter of course; it makes the room’s consistency count over a longer stretch. A sealed tents, steady conditions and cutting the moment the plant is ready rather than two weeks after remove most of the risk. A listing that states the breeder tests parents for hermaphrodite traits is worth worth hearing for a sativa than on any other category.
Equatorial
Describes lines from regions in which daylength barely varies across the year, which means that the plant never develop a sharp response to changing days. Such lines often start flowering slowly under a conventional twelve-hour light cycle, because twelve hours is, for them, an ordinary day rather than a signal.
The practical response, passed down between sativa growers for decades, is to shorten the light further: eleven hours, occasionally ten, particularly during the last weeks. It costs some yield yield and gains a more clearer finish. A listing that says “equatorial” is telling you about this in one word, and a grower who reads it as mere origin has missed the point hidden in it.
Latitude
The one figure that decides whether a sativa will finish outdoors, and a number no pack states. Equatorial plants need the run of shortening days to continue late enough for the plant to finish; in high latitudes the frost arrives first, and the grower harvests an half-finished plant in the end of October or watches it to mould in November. A closer to the equator, in the northern hemisphere, the longer the window runs, and Mediterranean and low-latitude gardens can finish plants that northern gardens never will.
The usable reading of a seed listing: an “outdoor” sativa finishing date is given for the breeder’s own latitude, usually somewhere within temperate Europe or the western United States, and each degree north of it pushes the finish back towards the frost. A grower above roughly the fiftieth parallel that wants a true sativa in the garden needs to be looking for an autoflower or a covered space, not a better summer.
Landrace
A population of plants shaped through generations to one region by local growers and growers alike, rather than by modern selection. Colombian, Colombian, Malawian and Mexican stock are the sativa examples. A landrace is variable, rather than a single plant: within a pack the flowering times, finishing times and smells range widely than a tent-bred line, and that variation is the whole value of growing one.
The trap is treating a landrace like a modern hybrid. It carries habits that made sense in an open field, such as a frame no tent can contain and a flowering rhythm tuned to a daylength the majority of growers never provide. “Heirloom” on a listing usually means a landrace that has been reproduced somewhere over a number of generations, typically with light selection towards indoor conditions; it is nearer to usable but nonetheless not a hybrid. A shop offering “landrace” without an collection region and a reproduction count is using the word loosely, and the seeds should be priced accordingly.