Sativa seeds come with more jargon around them than any other category of cannabis seed, and most of it says a certain thing to a botanist, another to a breeder and something different again to the person trying to make a decision in front of the listing. The failed sativa grow usually goes back to a word that was read in the wrong one of those senses: a flowering time read as a promise, a “sativa-dominant” label read as a description of character, a landrace bought like it were a modern hybrid. The entries below were put together with the range at https://hazesativaseeds.com open as the concrete examples, since it runs strongly towards the classic end of the category where the words carry the most weight most; the meanings themselves apply to any sativa seed from any shop. They are given in no particular order, because none of them makes sense on its own without the rest.
Equatorial (the twelve-hour problem)
Refers to lines from regions where daylength hardly varies through the year, and that the plant never develop a sharp reaction to changing days. These lines often flower reluctantly under a conventional twelve-hour light cycle, since twelve hours is, for them, a mild ordinary day rather than a signal.
The working fix, passed around among sativa growers over decades, is to shorten the light further: eleven hours, occasionally ten, particularly during the last weeks. It loses some yield yield and gains an more clearer finish. A listing that says “equatorial” is telling you about this in one word, and a grower that takes it as a note on geography misses the instruction inside it.
Latitude (outdoor sativas)
The one number that determines if a sativa will ripen outdoors, and one that no pack prints. Equatorial plants require a run of shortening days to continue late enough for the plant to ripen; in high latitudes the frost arrives before that, and the grower cuts a half-finished plant in the end of October or watches it rot in November. A further south, within the northern hemisphere, the longer the window stretches, and Mediterranean and subtropical growers can ripen plants that northern growers cannot.
The practical rule of a seed listing: an “outdoor” line finishing month is stated for the breeder’s home latitude, usually somewhere within southern Europe or the west coast of the United States, and each step north of that moves the finish later towards the frost. A grower north of about the fiftieth parallel who wants a long-flowering sativa in the garden is shopping for an autoflower or a covered space, and not a longer summer.
Foxtailing
The tendency of certain flowers to grow fresh bud growth on top of old ones, giving spired, irregular buds rather than dense ones. In the majority of indica-leaning strains it is a stress response, typically from light too close or a room that is too high, and the standard response is to correct the cause.
In a good number of sativas, especially Thai and some Haze lines, it is genetic and will occur in a perfect room. A first-time sativa grower often wastes a month hunting a problem that was never there, dropping lights and heat and delaying an already slow plant even more. The listing rarely warns which type to expect; the lineage usually tells you.
Flowering time (and what it is counted from)
The number of weeks between the start of flowering and harvest, which is the one most misread number on a sativa pack. For photoperiod seed it is measured from the day the light is cut to twelve hours, rather than from germination, so a “fourteen-week” sativa grown with an eight-week vegetative period is a five-month plant. Seed companies also quote the shorter end of the spread, because the longer end sells fewer seed.
Sativa plants take anywhere from ten weeks to well over twenty, and the longest strain in the Haze Sativa Seeds range comes in at around 16 weeks after the switch. The catalogue can be filtered by that figure, which is the sensible first step if you have a grower with a fixed schedule. A grower who adds four weeks to the figure the pack says is seldom disappointed.
Haze
Originally a specific line of plants put together in coastal California from Colombian, Colombian and Thai parents, and later kept and worked in the Netherlands. A true Haze grows tall, branches openly, flowers for twelve sixteen weeks and carries a scent of spice, citrus and something metallic that no line quite has.
In its second sense “Haze” is any cross which contains a share of that family, and by now is a great many of the sativa-leaning catalogue. A listing that reads “Haze” without lineage could be mostly percent the old family or a small fraction of it, and the grow character tracks the fraction, not the name. The working question is not “is it a Haze” but “how much, and through which parent”.
Hermaphroditism in long-flowering lines
The production of pollen-bearing flowers on a female plant, usually towards the end in flower and frequently in response to stress. Almost every cannabis line has some tendency to do; sativa lines express it more often, and the reason is a plain one: sixteen weeks of flower is sixteen weeks of opportunity for a timer leak, a heat spike or a missed watering that can trigger it going, and a old plant has waited beyond its natural finish often produces a few desperate male sacs on its own as a last attempt to set seed.
Not one of these means a sativa line weak by course; it means the room’s consistency count for longer. A sealed room, steady conditions and cutting when the plant is ready and not two week later take away the greater part of the problem. A listing that mentions a breeder tests parents for intersex traits is saying something worth hearing on a long-flowering line than for any else.
Stretch
The burst of upward growth that comes after the switch to flowering. Most tent-bred plants add around half again; sativas routinely double, and some landrace types triple. The stretch lasts three to four weeks and will not be halted after it has started, only bent sideways by training.
In tent terms, the stretch figure is the number to reading ahead of choosing when to flip. A sativa switched at sixty centimetres in a standard tent is at the lamp before week four of flower; one flipped at thirty centimetres centimetres has room. Growers coming over from indica stock nearly always flip too late the first time, and the consequence is written on the ceiling of the tent.
Sativa-dominant (the label)
The catalogue term rather than a measurable one. It generally means that the larger share of a hybrid’s parents are classed as sativa according to the breeder who drafted the listing, which occasionally signals no more than a certain the buds are airier or the smell brighter than the that breeder’s indica-labelled releases.
The experience people connect with a word, lively rather than heavy, is driven more by terpene chemistry and by cannabinoid content than by the sativa fraction, and plenty of “sativa-dominant” hybrids produce a flat sleepy result while a good number of indica-labelled lines do the reverse. To a buyer the percentage is useful for a loose hint to growth habit, flowering time and stretch; as a predictor to effect it is close to useless without the terpene notes.
Landrace versus heirloom
A population of plants shaped over centuries to a particular region by the local climate and climate together, and not by modern breeding. Thai, Colombian, Malawian and Mexican lines are the classic sativa cases. A landrace is variable, rather than a one plant: within a pack the flowering times, finishing times and aromas spread widely than a tent-bred line, and that spread is the point of growing one.
The mistake is buying a landrace like a finished product. It brings habits that make sense in an equatorial field, such as height that no tent can contain and a flowering rhythm tuned to a equatorial daylength most growers never provide. “Heirloom” in a listing usually means a landrace that has been reproduced away from its origin over a number of generations, often with light selection towards tent life; it is closer to manageable but nonetheless far from uniform. A shop listing “landrace” without an origin point and a generation history is using the word as a flavour, and the pack should be judged with that in mind.
Terpinolene (the “sativa smell”)
A terpene present in high proportion in a lot of classic sativa strains and responsible for much of what growers describe as the “sativa” smell: fresh, piney, citrus and slightly floral at once. It is volatile, driven off easily by fast drying, and terpinolene fades more quickly during storage than the heavier terpenes which lead most tent stock.
For a seed buyer the name earns two jobs. When a listing names terpinolene as the lead terpene, the line probably has real Haze-era ancestry regardless of what the label claims. And where the you are after that smell to still be there to the jar, the cure is going to be cool and slow; a warm drying room flattens a terpinolene sativa to something that smells of very little and leaves nothing of what the pack described.