Sativa seeds arrive with more vocabulary attached than any other kind of cannabis seed, and a good deal of it means a certain thing to a botanist, something else to a seed company and something different again to the person standing in front of the pack. A disappointing sativa grow usually traces back to a word that was read in the wrong one of those senses: a flowering time read as a fixed number, a “sativa-dominant” label read as a description of character, a landrace bought like it were a modern hybrid. The entries below are put together with the range at https://hazesativaseeds.com to hand as the concrete examples, since it runs heavily to the long-flowering end of the category where the words carry the most weight most; the meanings themselves apply to any sativa seed from any seller. They are in no particular order, because none of them makes usable on its own without the rest.
Stretch (the doubling)
The burst of vertical growth that follows the switch to flowering. Most tent-bred plants add half again; sativas commonly double, and some equatorial types go further. The stretch lasts two to five weeks and cannot be stopped once it begins, only redirected by training.
In practical terms, the stretch figure is a fact to reading ahead of deciding when to flip. A sativa switched at sixty centimetres inside a standard tent is touching the lamp before week four of flower; one flipped at thirty centimetres centimetres has room. Growers moving over from indica stock almost always flip far too late the first time, and the consequence is visible on the ceiling of the tent.
Equatorial (the twelve-hour problem)
Refers to plants from regions in which daylength hardly varies through the year, and that the plant does not develop a sharp response to changing days. These lines often start flowering slowly at a standard twelve-hour schedule, since twelve hours is, for them, an unremarkable day and not a signal.
The working fix, passed down among sativa growers over decades, is to cut the light further: eleven hours, sometimes ten, particularly during the last weeks. It costs some little yield and buys an earlier decisive end. A listing that uses “equatorial” is warning you about this in one word, and a grower that takes it as mere geography misses the point inside it.
Sativa-dominant (the label)
A marketing term rather than a measurable one. It usually means that more of a hybrid’s parents were classed as sativa by whoever wrote the description, and occasionally means no more than that the flowers are airier or the smell brighter than the same breeder’s indica-labelled lines.
The effect people connect with a word, lively rather than heavy, is governed more by terpene chemistry and the cannabinoid content than by the sativa fraction, and a good number of “sativa-dominant” hybrids deliver a flat sleepy result and plenty of the opposite stock do exactly the reverse. To a buyer the label is useful as a loose guide to growth habit, flowering time and stretch; as a guide to effect it is next to worthless without the terpene notes.
Latitude
The one figure that determines if a sativa can ripen outdoors, and one that no pack prints. Equatorial plants require a run of shortening days to continue late enough for the plant ripen; at high latitudes the frost arrives first, and the grower harvests a unripe plant in late October or loses it rot in November. A further south, within the northern hemisphere, the later the season runs, and Mediterranean or subtropical growers can ripen plants that temperate gardens cannot.
The usable rule of a seed listing: an “outdoor” sativa finishing date is given for the breeder’s own latitude, usually somewhere in temperate Europe or the western United States, and each degree north of that moves the date back towards the frost. A grower above about the fiftieth parallel who is after a long-flowering sativa in the garden needs to be shopping for an autoflower or a greenhouse, and not a better summer.
Landrace versus heirloom
A population of plants shaped over centuries to a particular region by local growers and climate alike, rather than by modern selection. Colombian, Thai, Congolese and Mexican lines are the sativa examples. A landrace is a spread, rather than a one plant: within a pack the flowering times, flowering times and aromas range widely than in a tent-bred hybrid, and this spread is the point of growing one.
The trap is buying a landrace like a finished product. It carries habits that made sense in an equatorial field, including height no tent can contain and a flowering rhythm set to an daylength the majority of growers never provide. “Heirloom” in a listing usually refers to a landrace that has been grown out somewhere over some generations, often with a degree of selection for indoor conditions; it is closer to usable but still not a hybrid. A shop listing “landrace” without a origin region and a generation history is applying the word as a flavour, and the pack should be judged accordingly.
Haze (the family, not the smell)
In its first sense a specific line of plants put together in 1970s California from Mexican, Colombian and South Indian parents, and then kept and refined in the Netherlands. The Haze runs tall, branches sparsely, takes for twelve to sixteen weeks and carries a scent of spice, citrus and a note metallic that no line exactly reproduces.
In its second sense “Haze” is whatever hybrid which carries a share of that family, and today is most of the sativa-leaning catalogue. A listing that says “Haze” without parents may be eighty percent original old family or a small fraction of it, and the grow time tracks the share, not the name. The working question is not “is it a Haze” but “how much, and through which parent”.
Flowering time
The number of weeks between the start of flowering and maturity, and the single most frequently misread number on a sativa pack. For photoperiod seed it is counted from the day the light is cut to twelve hours, rather than from sowing, so a “fourteen-week” sativa grown with a eight-week vegetative period is a five-month plant. Seed companies also quote the optimistic end of a range, since the longer end sells less seed.
Long-flowering plants run anywhere from ten weeks to more than twenty, and the slowest strain in the Haze Sativa Seeds range comes in at around 16 weeks after the switch. The catalogue can be filtered by this figure, which is the sensible first pass for a room on a tight timetable. A grower who adds four weeks on top of the figure the pack says is rarely disappointed.
Intersex tendency
The production of male flowers on a female plant, usually late in flower and often under stress. Every cannabis population carries a degree of capacity to it; sativa lines express it more often, for one simple reason: sixteen weeks of flower is fourteen weeks of opportunity for a light leak, a heat spike or a missed watering to trigger it off, and an old plant has already gone beyond its natural finish often produces a few desperate male flowers on its own in a final effort to make seed.
Not one of these makes a sativa line weak as a matter of course; it means the room’s discipline matter over longer. A sealed tents, steady temperatures and harvesting when the plant is ready and not a weeks later take away the greater part of the problem. A listing that mentions the breeder tests parents for intersex tendency is saying something worth hearing on a sativa than on any other category.
Foxtailing (and when it is not a fault)
The habit of certain flowers to push out fresh bud clusters on top of old ones, giving spired, irregular buds instead of dense ones. In the majority of indica-leaning lines it is a heat symptom, usually caused by light too close or temperatures too high, and the standard response is to correct the cause.
In many sativas, above all Thai and some Haze hybrids, it is built in and is going to occur in a flawless room. A new sativa grower frequently spends weeks chasing a problem that was never not a problem, lowering lights and temperatures and delaying an already long flower even more. The listing seldom warns which kind you should expect; the parentage usually does.