Sativa seeds come with more vocabulary around them than any other category of cannabis seed, and most of it means a certain thing to a botanist, something else to a breeder and something different again to the person 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 promise, a “sativa-dominant” tag read as a description of effect, a landrace bought as if it were a modern hybrid. The entries below were written with the range at https://hazesativaseeds.com open for the concrete examples, because it leans heavily to the long-flowering end of the category where the vocabulary carry the most weight most; the definitions themselves apply to any sativa seed from any seller. They are given in no special order, because none of them is sense without the rest.
Terpinolene
A terpene present in high proportion in many classic sativa lines and responsible for most of the thing growers describe as a “sativa” aroma: fresh, piney, citrus and faintly sweet all at once. It is fragile, driven off easily through hot drying, and terpinolene fades faster in storage than the earthier terpenes which dominate most tent lines.
To a seed buyer the word earns two jobs. When a listing names terpinolene among the lead terpene, the strain probably carries real old-sativa ancestry regardless of what the label claims. And when the grower wants that smell to still be there by the jar, the cure is going to be cool and cool; a fast dry turns a terpinolene sativa to a flower that smells of hay and nothing of what the pack promised.
Stretch (the doubling)
The burst of vertical growth which follows the change to flowering. Most tent-bred plants add around half again; sativas commonly double, and some equatorial lines go further. The stretch lasts three to four weeks and will not be stopped after it has started, merely redirected by training.
In tent terms, the stretch figure is the number to read before choosing when to switch. A sativa flipped at sixty centimetres centimetres in a two-metre 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 flip too late the first time, and the consequence is visible on the ceiling of the tent.
Landrace
A population of plants adapted over centuries to one region by local climate and climate alike, rather than by deliberate breeding. Thai, Thai, Congolese and Oaxacan lines are the classic sativa examples. A landrace is a spread, not a single plant: within a pack the flowering times, finishing times and aromas range widely than a tent-bred hybrid, and that variation is the whole value of growing one.
The trap is buying a landrace like a modern product. It brings habits that make sense in an equatorial field, including height that no tent can hold and a flowering rhythm tuned to an daylength the majority of growers never provide. “Heirloom” in a listing usually means a landrace that has been grown out somewhere for some generations, typically with a degree of selection towards indoor life; it is nearer to manageable but still not a hybrid. A shop listing “landrace” without a origin point and a generation count is using the word as a flavour, and the seeds should be priced accordingly.
Flowering time
The number of weeks between the onset of flowering and harvest, which is the single most frequently misunderstood number on a sativa pack. For photoperiod seed it is counted from the day the light drops to twelve hours, rather than from germination, so a “fourteen-week” sativa started with a eight-week vegetative stage is a twenty-two-week plant. Seed companies additionally give the shorter end of the spread, because the longer end moves fewer seed.
Sativa plants take anywhere from ten weeks to more than twenty, and the longest strain in the Haze Sativa Seeds range is at about 16 weeks after the flip. The catalogue can be sorted by this number, which is a reasonable first pass if you have a room on a fixed schedule. A grower who allows four weeks to whatever the pack states is rarely disappointed.
Hermaphroditism in long-flowering lines
The production of pollen-bearing flowers on a female plant, usually late in flower and often under stress. Every cannabis population has some tendency to do; sativa lines show it more often, for one simple one: fourteen weeks of flower is sixteen weeks of exposure for a timer leak, a temperature spike or a missed watering to set it off, and a old that has already gone past its natural finish frequently produces a few late pollen sacs on its own as a last attempt to make seed.
Not one of this means a sativa line weak as a matter of nature; it means the room’s discipline count for longer. Light-tight room, steady conditions and harvesting when the plant is ready rather than a weeks after remove most of the problem. A listing that mentions the breeder tests parents for intersex traits is saying something more on a long-flowering line than for any other category.
Sativa-dominant (the label)
A marketing term and not a measurable one. It usually means that more of a hybrid’s lineage are described as sativa according to whoever drafted the description, which sometimes means no more than a certain the buds are longer or the smell sharper than the same breeder’s other lines.
The effect people associate with a word, clear-headed instead of heavy, is governed far more by terpene chemistry and the cannabinoid balance than by ancestry, and a good number of “sativa-dominant” hybrids deliver a flat couch result and plenty of the opposite lines deliver the opposite. For a buyer the label is useful as a rough hint to growth habit, flowering time and stretch; as a predictor to how it feels it is next to useless without the terpene notes.
Haze (the family, not the smell)
In its first sense a specific line of plants put together in coastal California from Colombian, Colombian and Thai parents, and later preserved and worked in the Netherlands. A true Haze runs tall, fills out openly, takes for twelve to sixteen weeks and smells of spice, citrus and something metallic that no line exactly reproduces.
In its second sense “Haze” is any cross that contains a share of that family, which by now is most of the sativa-leaning market. A listing that says “Haze” and gives no parents could be eighty percent the classic family or one sixteenth of it, and the flowering character follows the fraction, not the name. The working question is never “is it a Haze” but “how much, and via which parent”.
Equatorial
Describes lines from regions in which daylength hardly changes through the year, and that the plant never develop a strong reaction to changing days. These plants frequently start flowering reluctantly at a conventional twelve-hour light cycle, because twelve hours is, to them, an ordinary day rather than a signal.
The working fix, handed down between sativa growers over decades, is to shorten the light further: eleven hours, sometimes ten, especially in the final weeks. It loses some little yield and buys a earlier decisive finish. A listing that uses “equatorial” is telling you this in one word, and a grower who reads it as a note on origin has missed the point hidden in it.
Latitude (outdoor sativas)
The one number that decides whether a sativa can ripen outdoors, and a number that no pack prints. Long-flowering lines need a run of shortening days to go on long enough for the plant ripen; at high latitudes the frost arrives before that, and the grower harvests a half-finished plant in late October or watches it to mould in November. A further south, within the northern hemisphere, the longer the window stretches, and Mediterranean or subtropical gardens can finish lines that northern gardens never will.
The usable reading for a seed pack: an “outdoor” line finishing month is stated for the breeder’s home latitude, usually a point within temperate Europe or the western United States, and each step further north of that pushes the date back into the frost. A grower above roughly the fiftieth parallel who wants a true sativa outdoors needs to be shopping for a sativa autoflower or else a covered space, not a longer season.
Foxtailing (and when it is not a fault)
The tendency of some flowers to grow new calyx growth on top of existing ones, producing spired, irregular buds instead of dense ones. In the majority of tent-bred lines it is a heat response, typically caused by light too close or temperatures too high, and the standard response is to fix the room.
In a good number of sativas, especially Southeast Asian and some Haze lines, it is genetic and will occur under a perfect room. A first-time sativa grower frequently wastes weeks hunting a fault that is a problem, lowering lights and heat only delaying an already slow plant further. The listing rarely says which kind to expect; the parentage generally tells you.