Sativa seeds arrive with more vocabulary around them than any other kind of cannabis seed, and most of it means one thing to a botanist, something else to a breeder and something different again to the grower standing 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” tag read as a statement of effect, a landrace bought like 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 runs strongly towards the classic end of the spectrum where the words carry the most weight most; the definitions though apply to any sativa seed from any shop. They are given in no special order, since not one of them makes sense without the rest.
Stretch
The surge of vertical growth that follows the switch to flowering. Most tent-bred plants add around half their height again; sativas routinely double, and some equatorial types go further. The stretch lasts three to four weeks and will not be stopped once it has started, only bent sideways by training.
In practical terms, a stretch figure is a number to read before choosing when to switch. A sativa switched at sixty centimetres inside a standard tent is touching the lamp by week four of flower; one switched at thirty centimetres centimetres has room. Growers moving over from indica strains almost always switch far too late the first time, and the consequence is written on the ceiling of the tent.
Equatorial
Refers to lines from regions in which daylength barely changes across the year, and that the plant does not evolved a sharp reaction to shortening days. Such plants frequently start flowering slowly under a standard twelve-hour schedule, because twelve hours is, for them, an unremarkable day rather than a signal.
The practical response, handed down among sativa growers over decades, is to cut the light more: eleven hours, occasionally ten, especially in the last weeks. It loses some yield yield and gains an more decisive finish. A listing which uses “equatorial” is telling you about this in one word, and a grower who reads it as a note on origin has missed the point hidden in it.
Hermaphroditism in long-flowering lines
The production of male flowers on a female plant, typically towards the end in flower and frequently in response to stress. Every cannabis line has some capacity for do; sativa plants express it more, for one plain reason: fourteen weeks of flower is sixteen weeks of exposure for a light leak, a temperature spike or a missed watering to trigger it going, and a old plant has already gone beyond its intended finish often throws a few late male flowers on its own as a last effort to make seed.
None of these means a sativa line unstable as a matter of nature; it means the room’s consistency count for longer. A sealed tents, steady temperatures and cutting the moment the plant is done rather than a week after take away most of the risk. A listing that states a breeder tests parents for intersex traits is saying something worth hearing for a sativa than for anything else.
Latitude (outdoor sativas)
The single number that decides whether a sativa can finish outdoors, and a number no pack states. Long-flowering plants need a run of shortening days to continue late enough to let the plant finish; in high latitudes the frost arrives before that, and the grower harvests an unripe plant in the end of October or else watches it rot in November. A closer to the equator, in a northern hemisphere, the longer the season runs, and Mediterranean and subtropical gardens are able to finish lines that northern gardens cannot.
The practical reading of a seed listing: an “outdoor” sativa finishing date is stated for the breeder’s home latitude, usually somewhere within temperate Europe or the western United States, and each step further north of that pushes the finish back towards the frost. A grower north of roughly the fiftieth parallel who is after a long-flowering sativa in the garden is looking for an autoflower or a greenhouse, and not a longer season.
Foxtailing
The tendency of certain flowers to push out new calyx growth on top of existing ones, giving spired, irregular buds rather than round ones. In the majority of indica-leaning lines it is a stress response, typically from light too close or temperatures that is too high, and the standard response is to correct the room.
In a good number of sativas, especially Southeast Asian and certain Haze lines, it is genetic and is going to happen under a flawless room. A first-time sativa grower often spends a month chasing a fault that is not there, lowering lights and temperatures only slowing a long flower further. The listing seldom says which type you should expect; the parentage generally tells you.
Sativa-dominant
The marketing term and not a measurable one. It generally indicates that the larger share of a hybrid’s lineage were described as sativa according to whoever wrote the description, which sometimes means nothing more than that the flowers are airier or the aroma brighter than the that breeder’s other lines.
The effect people connect with a word, lively instead of sedating, is driven more by terpene profile and the cannabinoid content than by the sativa fraction, and a good number of “sativa-dominant” hybrids deliver a heavy couch effect and a good number of indica-labelled stock do exactly the opposite. For a buyer the label is useful as a rough hint to growth habit, flowering time and stretch; for a guide to effect it is next to useless unless accompanied by the aroma description.
Terpinolene (the “sativa smell”)
A terpene found in high amounts in a lot of classic sativa lines and accounting for much of the thing growers describe as a “sativa” aroma: green, woody, citrus and slightly sweet at once. It is volatile, driven off quickly by fast drying, and terpinolene degrades faster in storage than the heavier terpenes that lead indica-leaning lines.
To a seed buyer the name does two things. When a listing lists terpinolene as the lead terpene, the strain most likely has real Haze-era genetics regardless of what the label claims. And where the grower wants that smell to still be there by the jar, the drying has to be cool and cool; a fast drying room flattens a terpinolene line to a flower that smells of very little and leaves nothing of what the pack promised.
Landrace versus heirloom
A population of plants adapted through generations to one region by local climate and climate alike, and not by modern breeding. Colombian, Thai, Congolese and Oaxacan lines are the sativa cases. A landrace is a spread, not a one plant: inside a pack the flowering times, flowering times and aromas range far more than in a tent-bred line, and this variation is the point of growing one.
The trap is buying a landrace as a modern hybrid. It carries habits that made sense in an open field, including height that no tent can hold and a flowering clock tuned to an equatorial daylength most growers never offer. “Heirloom” in a listing generally refers to a landrace that has been reproduced away from its origin for a number of generations, often with light selection for indoor life; it is nearer to usable but still not a hybrid. A shop listing “landrace” without an collection point and a generation count is using the word as a flavour, and the pack should be priced accordingly.
Haze
In its first sense a specific line of plants bred in 1970s California from Mexican, Thai and South Indian landraces, and then kept and worked in the Netherlands. A true Haze grows tall, fills out sparsely, flowers for twelve to sixteen weeks and smells of incense, pine and something metallic that no other line exactly reproduces.
In its second sense “Haze” is any cross which contains a share of that family, and today is most of the sativa-leaning market. A listing which says “Haze” and gives no lineage could be eighty percent the old family or one small fraction of it, and the flowering character tracks the fraction, not the name. The useful question is never “is it a Haze” but “how much, and via which parent”.
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. With photoperiod seed it is counted from the day the light is cut to twelve hours, not from germination, so a “fourteen-week” sativa started with a ordinary vegetative period is a twenty-two-week plant. Breeders additionally quote the optimistic end of the range, since the longer end sells fewer seed.
Sativa lines run anywhere from ten weeks to more than twenty, and the longest strain in the Haze Sativa Seeds range comes in at about 16 weeks from the switch. The catalogue can be filtered by this number, which is the sensible first pass for a grower on a tight timetable. A grower who allows four weeks to the figure the pack states is rarely disappointed.