Reading Sativa Seed Packs: The Glossary
Sativa seeds come with more jargon around them than any other kind of cannabis seed, and most of it means one thing to a botanist, another to a seed company and a third to the person trying to make a decision in front of the pack. A disappointing sativa grow nearly always goes back to a word that was read in the wrong one of those senses: a flowering time taken as a fixed number, a «sativa-dominant» tag read as a description of character, a landrace chosen as if it were a modern hybrid. The entries below were written with the range at https://hazesativaseeds.com to hand as reference, because it leans strongly to the classic end of the spectrum where the vocabulary matter most; the definitions themselves apply to any sativa seed from any seller. They are given in no special order, since not one of them makes sense without the others.
Flowering time
The figure of weeks from the start of flowering and harvest, which is the one most frequently misread figure on a sativa pack. For photoperiod seed it is measured from the day the light drops to twelve hours, not from germination, so a «fourteen-week» sativa grown after a eight-week vegetative stage is a twenty-two-week plant. Seed companies additionally quote the shorter end of a range, because the other end moves less seed.
Sativa plants run anywhere from ten weeks to well over twenty, and the slowest line in the Haze Sativa Seeds range comes in at about 16 weeks from the flip. The catalogue can be sorted by that figure, which is the sensible first step if you have a grower on a fixed schedule. A grower who adds four weeks on top of whatever the pack says is rarely disappointed.
Equatorial (the twelve-hour problem)
Refers to lines out of regions in which daylength hardly varies through the year, and that the plant never evolved a strong response to changing days. Such plants frequently flower reluctantly at a conventional twelve-hour schedule, because twelve hours is, for them, a mild unremarkable day rather than a signal.
The practical response, handed around between sativa growers over decades, is to shorten the light more: eleven hours, sometimes ten, particularly during the final weeks. It costs a yield yield and buys a more decisive end. A listing that uses «equatorial» is warning you this in one word, and a grower who reads it as a note on geography has missed the instruction hidden in it.
Landrace versus heirloom
A population of plants adapted through centuries to one place by local growers and growers together, rather than by modern selection. Colombian, Colombian, Congolese and Mexican lines are the classic sativa examples. A landrace is a spread, rather than a single plant: inside a pack the flowering times, flowering times and smells spread far more than in any tent-bred hybrid, and that spread is the whole value of growing one.
The mistake is treating a landrace as a finished product. It brings habits that make sense in an open field, including a frame that no tent can contain and a flowering clock tuned to a daylength the majority of growers cannot provide. «Heirloom» in a listing usually refers to a landrace that has been reproduced somewhere over some generations, typically with light selection towards indoor conditions; it is nearer to usable but nonetheless not uniform. A seller listing «landrace» without an collection point and a generation history is applying the word as a flavour, and the seeds should be judged accordingly.
Foxtailing (and when it is not a fault)
The tendency of some flowers to grow new calyx clusters on top of existing ones, giving towered, irregular buds instead of round ones. In most tent-bred strains it is a stress response, usually from light that is too close or a room too high, and the advice is to fix the room.
In many sativas, above all Thai and some Haze lines, it is built in and is going to happen in a perfect room. A new sativa grower often spends weeks hunting a problem that is not there, dropping lights and temperatures and delaying a slow flower even more. The breeder seldom warns which kind you should expect; the parentage generally tells you.
Intersex tendency
The appearance of male flowers on a female plant, usually late in flower and frequently in response to stress. Every cannabis population carries some capacity to it; sativa lines show it more, for one simple one: sixteen weeks of flower is fourteen weeks of opportunity for a light leak, a temperature spike or a missed watering that can set it going, and an old plant has already gone beyond its natural end frequently throws a few late male flowers on its own in a final attempt to set seed.
Not one of these makes a sativa line unstable as a matter of nature; it means the grower’s consistency matter for longer. A sealed room, steady conditions and cutting when the plant is done rather than two weeks after remove most of the problem. A listing which mentions a breeder tests parents for hermaphrodite traits is worth more for a long-flowering line than for any other category.
Haze
In its first sense a specific family 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, fills out sparsely, flowers for twelve sixteen weeks and smells of incense, citrus and something metallic that no other other line exactly reproduces.
In its second sense «Haze» is any hybrid which carries a share of that family, which by now is most of the sativa-leaning market. A listing which says «Haze» without parents may be eighty percent the classic family or one sixteenth of it, and the flowering character follows the fraction, not the name. The useful question is not «is it a Haze» but «how much, and through which parent».
Stretch (the doubling)
The surge of upward growth that comes after the switch to flowering. Indica-leaning plants add half their height again; sativas commonly double, and a few equatorial lines go further. The stretch lasts two to four weeks and cannot be stopped once it begins, merely redirected by training.
In practical terms, a stretch multiplier is the fact worth read ahead of choosing when to switch. A sativa switched at sixty centimetres centimetres inside a two-metre tent is touching the lamp before week four of flower; one flipped at thirty centimetres has room. Growers moving from indica stock nearly always flip too late the first time, and the consequence is written on the ceiling of the tent.
Terpinolene (the «sativa smell»)
A aromatic compound present in high amounts in many classic sativa lines and responsible for most of what growers describe as a «sativa» smell: green, piney, citrus and faintly sweet all at once. It is volatile, driven off quickly through hot drying, and terpinolene degrades faster during storage than the heavier terpenes which lead indica-leaning stock.
For a seed buyer the name does two jobs. Where a listing names terpinolene as the leading aromas, the strain probably carries substantial Haze-era ancestry whatever the label says. And when the you wants that smell to still be there to the jar, the drying is going to be slow and cool; a warm dry flattens a terpinolene sativa into something that tastes of hay and nothing of what the pack promised.
Latitude (outdoor sativas)
The one number that decides whether a sativa will finish outdoors, and a number no pack states. Long-flowering lines require the autumn days to continue late enough for the plant to ripen; at high latitudes the frost arrives first, and the grower cuts a unripe plant in late October or watches it to mould in November. A closer to the equator, in the northern hemisphere, the later the window stretches, and coastal and subtropical gardens can ripen lines that temperate growers never will.
The practical rule for a seed listing: an «outdoor» line harvest date is stated for the breeder’s own latitude, usually somewhere in temperate Europe or the western United States, and each step north of it pushes the date back into the frost. A grower north of about the fiftieth parallel that wants a true sativa in the garden needs to be looking for an autoflower or a greenhouse, not a longer season.