Sativa seeds come with more vocabulary attached than any other category of cannabis seed, and a good deal of it says a certain thing to a botanist, another to a seed company and a third to the grower trying to make a decision in front of the pack. The disappointing sativa grow usually goes back to a word that was read in the wrong sense: a flowering time taken as a promise, a “sativa-dominant” label read as a description of effect, a landrace bought like it were a modern hybrid. The entries below were written with the range at https://hazesativaseeds.com open for the concrete examples, since it runs strongly to the classic end of the spectrum where the words carry the most weight most; the meanings themselves apply to any sativa seed from any shop. They are in no particular order, since none of them is sense without the others.
Landrace versus heirloom
A population of plants adapted through generations to one region by the local climate and climate together, and not by deliberate selection. Thai, Colombian, Malawian and Mexican lines are the classic sativa cases. A landrace is a spread, rather than a single plant: inside a pack the flowering times, finishing times and smells range widely than a tent-bred line, and that spread is the point of growing one.
The mistake is treating a landrace like a modern product. It carries habits that make sense in an open field, such as height no tent can hold and a flowering rhythm tuned to an equatorial daylength most growers never offer. “Heirloom” in a listing generally means a landrace that has been grown out away from its origin over a number of generations, typically with light selection for tent life; it is closer to usable but still far from a hybrid. A shop offering “landrace” that does not give a collection region and a generation history is using the word as a flavour, and the pack should be priced with that in mind.
Sativa-dominant (the label)
A catalogue category and not a measurable one. The phrase generally means that more of a hybrid’s lineage were described as sativa by whoever wrote the listing, which sometimes means nothing more than that the buds are airier or the aroma sharper than the that breeder’s other releases.
The effect people connect with a word, lively instead of heavy, is driven more by terpene chemistry and by cannabinoid content than it is by the sativa fraction, and a good number of “sativa-dominant” releases deliver a flat sleepy effect and a good number of the opposite stock do exactly the reverse. For a buyer the label is useful for a loose guide to growth habit, flowering time and stretch; for a predictor to effect it is close to worthless without the aroma description.
Foxtailing
The tendency of some flowers to grow fresh calyx clusters on top of existing ones, producing spired, open buds instead of round ones. In most indica-leaning strains it is a heat symptom, usually caused by light that is too close or temperatures too high, and the standard response is to fix the cause.
In many sativas, especially Thai and some Haze lines, it is built in and is going to happen under a perfect room. A first-time sativa grower often spends a month hunting a problem that is there, dropping lights and temperatures only slowing a long plant even more. The listing seldom warns which kind to expect; the lineage usually tells you.
Equatorial
Describes lines from latitudes where daylength hardly changes across the year, which means that the plant does not evolved a strong reaction to changing days. These plants frequently flower slowly under a conventional twelve-hour light cycle, since twelve hours is, to them, a mild unremarkable day rather than a signal.
The practical response, handed around among sativa growers for decades, is to shorten the light more: eleven hours, sometimes ten, especially in the final weeks. It loses some little yield and gains a more clearer finish. A listing that says “equatorial” is warning you this with one word, and a grower that takes it as a note on origin has missed the point inside it.
Intersex tendency
The appearance of pollen-bearing flowers on a female plant, usually late in flower and frequently under stress. Almost every cannabis population carries a degree of tendency for it; long-flowering lines show it more often, for one simple one: fourteen weeks of flower is fourteen weeks of exposure for a timer leak, a heat spike or a missed watering that can trigger it going, and an old that has already gone beyond its intended end often throws a few desperate pollen sacs on its own in a final effort to set seed.
Not one of this makes a sativa line unstable as a matter of course; it makes the grower’s discipline matter over longer. A sealed tents, steady conditions and cutting the moment the plant is ready rather than two week later take away the greater part of the problem. A listing that mentions a breeder tests parents for intersex tendency is worth more for a long-flowering line than on any else.
Latitude (outdoor sativas)
The single figure that determines whether a sativa can ripen outdoors, and one no pack states. Equatorial lines require the run of shortening days to go on late enough to let the plant finish; in high latitudes the frost arrives before that, and the grower cuts an half-finished plant in late October or loses it rot in November. The closer south, within a northern hemisphere, the longer the window runs, and coastal or subtropical growers can finish lines that northern growers never will.
The practical reading of a seed pack: an “outdoor” sativa finishing month is given for the breeder’s home latitude, usually a point in temperate Europe or the western United States, and every degree further north of that moves the date back towards the weather. A grower above roughly the fiftieth parallel that wants a long-flowering sativa in the garden is shopping for a sativa autoflower or else a covered space, and not a longer season.
Flowering time (and what it is counted from)
The figure of weeks from the start of flowering and harvest, which is the single most misread number on a sativa pack. For photoperiod seed it is measured from the day the light drops to twelve hours, not from sowing, so a “fourteen-week” sativa grown after a ordinary vegetative stage is a five-month plant. Breeders also quote the shorter end of a range, because the other end sells fewer seed.
Sativa lines take everywhere from ten weeks to more than 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 number, which is a sensible first pass if you have a room on a fixed schedule. A grower who allows four weeks to the figure the pack says is rarely caught out.
Haze (the family, not the smell)
Originally a particular line of plants bred in coastal California from Colombian, Thai and South Indian landraces, and later preserved and refined in the Netherlands. The Haze grows tall, branches openly, flowers for twelve to sixteen weeks and carries a scent of incense, pine and a note sharp that no other line exactly reproduces.
In its second sense “Haze” is whatever cross that carries a share of that family, and by now is a great many of the sativa-leaning catalogue. A listing which says “Haze” and gives no parents could be mostly percent the old family or one sixteenth of it, and the flowering character follows the share, not the name. The working question is not “is it a Haze” but “how much, and via which parent”.
Stretch (the doubling)
The burst of upward growth that comes after the change to flowering. Indica-leaning plants add around half their height again; sativas routinely double, and some landrace types go further. The stretch continues three to four weeks and cannot be halted after it has started, only redirected by training.
In tent terms, a stretch multiplier is a number worth read ahead of choosing when to switch. A sativa switched at sixty centimetres in a standard tent is touching the lamp by week four of flower; one switched at thirty centimetres centimetres has room. Growers coming over from indica stock almost always switch too late the first time, and the consequence is visible on the ceiling of the tent.