Sativa seeds arrive with more vocabulary around them than any other category of cannabis seed, and a good deal of it says one thing to a botanist, something else to a breeder and something different again to the person trying to make a decision in front of the pack. A failed sativa grow usually traces back to a word that was understood in the wrong one of those senses: a flowering time read as a promise, a “sativa-dominant” tag read as a description of character, a landrace chosen like it were a tent-bred hybrid. The entries below were put together with the range at https://hazesativaseeds.com open as reference, because it leans strongly towards the classic end of the category and that is where the words carry the most weight most; the meanings though apply to any sativa seed from any shop. They are in no special order, since none of them is sense on its own without the rest.
Haze
Originally a specific line of plants put together in coastal California from Mexican, Thai and Thai parents, and then kept and refined in the Netherlands. A true Haze grows tall, fills out sparsely, takes for twelve to sixteen weeks and carries a scent of incense, citrus and a note metallic that no other line exactly reproduces.
In its looser sense “Haze” is whatever cross that carries some of that family, and today is most of the sativa-leaning market. A listing that reads “Haze” and gives no parents may be eighty percent the old family or a small fraction of it, and the flowering time tracks the fraction, not the name. The useful question is not “is it a Haze” but “how much, and via which parent”.
Sativa-dominant
The marketing category rather than a measurable one. The phrase usually means that the larger share of a hybrid’s lineage were classed as sativa by the breeder who wrote the listing, and sometimes signals no more than a certain the flowers are airier or the aroma sharper than the same breeder’s indica-labelled releases.
The experience people connect with the word, clear-headed rather than heavy, is driven more by terpene chemistry and the cannabinoid balance than by ancestry, and a good number of “sativa-dominant” hybrids produce a heavy couch effect while a good number of indica-labelled lines deliver exactly the reverse. For a grower the label is worth something for a loose guide to growth habit, flowering time and stretch; as a predictor to how it feels it is close to worthless unless accompanied by the aroma description.
Flowering time
The number 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 counted from the day the light drops to twelve hours, not from sowing, so a “fourteen-week” sativa grown with a eight-week vegetative stage is a five-month plant. Breeders also give the optimistic end of a spread, because the other end sells fewer seed.
Sativa lines run anywhere from ten weeks to more than twenty, and the longest line in the Haze Sativa Seeds range is at about 16 weeks after the switch. The catalogue can be filtered by this figure, which is a reasonable first step if you have a room on a tight schedule. A grower who allows four weeks to whatever the pack says is seldom caught out.
Foxtailing (and when it is not a fault)
The habit of certain flowers to grow new calyx clusters on top of old ones, giving spired, open buds instead of dense ones. In most indica-leaning strains it is a stress response, typically from light that is too close or temperatures that is too high, and the advice is to fix the cause.
In many sativas, above all Southeast Asian and some Haze lines, it is genetic and will occur under a flawless room. A first-time sativa grower frequently spends weeks hunting a fault that is not there, dropping lights and heat only slowing an already slow flower further. The breeder rarely says which type to expect; the parentage generally does.
Equatorial (the twelve-hour problem)
Describes plants from latitudes in which daylength hardly varies across the year, which means where the plant never evolved a strong response to changing days. These plants frequently flower slowly at a standard twelve-hour schedule, since twelve hours is, to them, a mild ordinary day rather than a signal.
The practical fix, handed around among sativa growers over decades, is to shorten the light more: eleven hours, sometimes ten, particularly during the last weeks. It costs a yield yield and gains a earlier clearer end. A listing which uses “equatorial” is warning you about this in one word, and a grower that reads it as a note on geography misses the instruction inside it.
Intersex tendency
The production of male flowers on a female plant, usually late in flower and frequently in response to stress. Every cannabis line carries a degree of capacity for do; long-flowering plants show it more often, and the reason is a simple reason: fourteen weeks of flower is fourteen weeks of opportunity for a timer leak, a temperature spike or a missed watering that can set it going, and an old plant has already waited beyond its natural finish often throws a few desperate pollen sacs on its own as a final effort to set seed.
None of this makes a sativa line weak by course; it means the room’s discipline matter over a longer stretch. Light-tight room, stable conditions and harvesting the moment the plant is ready rather than a weeks later take away the greater part of the problem. A listing that mentions a breeder screens parents for hermaphrodite tendency is worth worth hearing on a sativa than for any else.
Landrace
A population of plants shaped through centuries to a particular region by local climate and growers together, rather than by deliberate breeding. Colombian, Colombian, Malawian and Mexican stock are the sativa examples. A landrace is a spread, not a one plant: within a pack the heights, flowering times and aromas range widely than in a tent-bred line, and this variation is the whole value of keeping one.
The trap is buying a landrace like a finished product. It carries habits that made sense in an open field, such as height no tent can hold and a flowering clock set to an equatorial daylength the majority of growers never offer. “Heirloom” on a listing usually refers to a landrace that has been reproduced somewhere for a number of generations, often with light selection towards indoor conditions; it is closer to manageable but still not uniform. A seller listing “landrace” without an origin region and a generation count is applying the word as a flavour, and the pack should be judged accordingly.
Terpinolene
A terpene present in high amounts in many classic sativa strains and responsible for most of what growers describe as the “sativa” aroma: green, woody, citrus and slightly floral at once. It is fragile, lost easily through fast drying, and terpinolene degrades more quickly during storage than the heavier terpenes which lead indica-leaning lines.
For a seed buyer the name earns two things. Where a listing names terpinolene among the leading terpene, the strain probably carries substantial old-sativa ancestry regardless of what the label claims. And when the grower are after that smell to still be there to the jar, the drying has to be cool and slow; a warm drying room turns a terpinolene line to something that tastes of hay and no trace of what the pack promised.
Latitude (outdoor sativas)
The one figure that determines if a sativa will finish outdoors, and a number no pack prints. Long-flowering plants need a autumn days to continue late enough to let the plant to finish; in northern latitudes the frost comes first, and the grower harvests a unripe plant in late October or else watches it rot in November. The closer to the equator, within a northern hemisphere, the longer the window stretches, and Mediterranean and low-latitude gardens are able to finish lines that temperate growers cannot.
The usable rule for a seed listing: an “outdoor” sativa finishing date is stated for the breeder’s own latitude, normally a point in southern Europe or the western United States, and each step north of it moves the date later into the weather. A grower above roughly the fiftieth parallel who wants a long-flowering sativa outdoors needs to be shopping for an autoflower or a greenhouse, and not a better summer.
Stretch
The burst of vertical growth that comes after the change to flowering. Indica-leaning plants gain half again; sativas routinely double, and some landrace types triple. The stretch continues three to five weeks and will not be stopped after it has started, only redirected by training.
In tent terms, the stretch figure is a fact worth reading ahead of deciding when to switch. A sativa switched at sixty centimetres centimetres inside a standard tent is touching the lamp before week four of flower; one flipped at thirty centimetres has room. People coming over from indica strains almost always switch far too late the first time, and the consequence is visible on the ceiling of the tent.