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Sativa seeds come with more jargon attached than any other category of cannabis seed, and most of it means one thing to a botanist, something else to a seed company 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 taken as a fixed number, a «sativa-dominant» label read as a statement of character, a landrace bought as if it were a tent-bred hybrid. The entries below were written with the range at https://hazesativaseeds.com to hand as the concrete examples, because it leans strongly to the classic end of the spectrum where the words carry the most weight most; the definitions themselves hold to any sativa seed from any shop. They are given in no special order, since not one of them is usable without the others.
Foxtailing
The tendency of some flowers to push out new calyx growth on top of existing ones, giving towered, open buds instead of round ones. In most tent-bred strains it is a heat symptom, usually from light too close or temperatures that is too high, and the standard response is to correct the cause.
In many sativas, above all Thai and certain Haze lines, it is genetic and is going to occur in a perfect room. A new sativa grower often wastes weeks chasing a problem that is a problem, lowering lights and heat only slowing an already long plant further. The breeder seldom warns which type to expect; the parentage generally tells you.
Terpinolene (the «sativa smell»)
A aromatic compound found in large amounts in a lot of old sativa strains and responsible for most of what growers describe as a «sativa» smell: fresh, piney, lemon and slightly sweet at once. It is volatile, driven off quickly by hot drying, and it degrades more quickly during storage than the earthier terpenes which dominate indica-leaning stock.
For a seed buyer the name earns two things. When a listing names terpinolene among the leading terpene, the strain probably has substantial old-sativa genetics regardless of what the percentage claims. And when the grower are after that profile to survive by the jar, the drying is going to be cool and cool; a warm drying room flattens a terpinolene sativa into something that smells of very little and nothing of what the pack promised.
Haze (the family, not the smell)
Originally a specific line of plants bred in coastal California from Mexican, Thai and Thai parents, and then preserved and worked in the Netherlands. A true Haze runs tall, fills out sparsely, flowers for twelve to sixteen weeks and carries a scent of spice, pine and something metallic that no other line exactly reproduces.
In its second sense «Haze» is whatever hybrid which carries some of that family, which today is most of the sativa-leaning market. A listing which reads «Haze» without parents may be mostly percent the old family or one sixteenth of it, and the grow time follows the fraction, not the name. The working question is never «is it a Haze» but «how much, and through which parent».
Sativa-dominant (the label)
A marketing category rather than a measurable one. The phrase generally means that more of a hybrid’s parents are classed as sativa by the breeder who wrote the listing, and sometimes means nothing more than that the buds are airier or the smell brighter than the same breeder’s indica-labelled lines.
The experience people connect with a word, lively rather than sedating, is governed more by terpene chemistry and by cannabinoid balance than by ancestry, and a good number of «sativa-dominant» hybrids deliver a heavy sleepy result while a good number of the opposite stock deliver exactly the reverse. To a grower the label is worth something as a rough guide to growth habit, flowering time and stretch; as a predictor to how it feels it is next to useless unless accompanied by the terpene description.
Landrace versus heirloom
A population of plants adapted over centuries to one region by the local climate and climate together, rather than by deliberate breeding. Thai, Colombian, Malawian and Oaxacan lines are the sativa cases. A landrace is a spread, not a single plant: inside a pack the flowering times, finishing times and smells range widely than a tent-bred hybrid, and that variation is the point of growing one.
The mistake is buying a landrace as a modern hybrid. It brings traits that made sense in an open field, including height that no tent can hold and a flowering rhythm set to an daylength the majority of growers never provide. «Heirloom» on a listing usually refers to a landrace that has been grown out somewhere over a number of generations, typically with a degree of selection for tent life; it is closer to usable but still not a hybrid. A shop listing «landrace» that does not give an collection point and a reproduction history is using the word as a flavour, and the pack should be priced accordingly.
Flowering time (and what it is counted from)
The number of weeks between the start of flowering and maturity, which is the single most frequently 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 started after a ordinary vegetative period is a twenty-two-week plant. Breeders additionally give the shorter end of the spread, since the longer end moves fewer seed.
Long-flowering lines take everywhere from ten weeks to well over twenty, and the slowest strain in the Haze Sativa Seeds range comes in at about 16 weeks from the switch. The catalogue can be sorted by this number, which is the sensible first step for a grower with a tight timetable. A grower who adds four weeks on top of whatever the pack says is seldom caught out.
Equatorial (the twelve-hour problem)
Describes plants from regions where daylength hardly changes across the year, which means where the plant never evolved a sharp response to shortening days. Such lines frequently start flowering reluctantly under a standard twelve-hour light cycle, since twelve hours is, for them, an unremarkable day and not a signal.
The working response, passed around among sativa growers for decades, is to shorten the light more: eleven hours, occasionally ten, particularly in the last weeks. It costs a little yield and gains a earlier decisive end. A listing which says «equatorial» is telling you this with one word, and a grower who reads it as mere origin has missed the instruction inside it.
Stretch
The surge of vertical growth which follows the change to flowering. Indica-leaning plants add half again; sativas commonly double, and a few equatorial types go further. The stretch lasts three to five weeks and will not be halted once it has started, merely bent sideways by training.
In practical terms, the stretch figure is a number worth read before choosing when to switch. A sativa flipped at sixty centimetres centimetres in a standard tent is at the lamp by week four of flower; one flipped at thirty centimetres centimetres has room. Growers moving from indica stock nearly always flip far too late the first time, and the lesson is visible on the ceiling of the tent.
Latitude
The single number that determines if a sativa will ripen outdoors, and a number no pack states. Long-flowering lines need the autumn days to continue long enough to let the plant ripen; in northern latitudes the frost arrives first, and the grower cuts a unripe plant in late October or watches it rot in November. The closer south, within the northern hemisphere, the longer the season runs, and Mediterranean and subtropical growers are able to ripen lines that northern growers cannot.
The usable reading for a seed pack: an «outdoor» sativa harvest month is stated for the breeder’s own latitude, usually somewhere in southern Europe or the west coast of the United States, and each degree north of it moves the finish later towards the weather. A grower above about the fiftieth parallel who wants a long-flowering sativa in the garden needs to be shopping for a sativa autoflower or else a greenhouse, not a longer season.
