Sativa seeds come with more jargon attached than any other category of cannabis seed, and most of it says one thing to a botanist, another to a seed company and something different again to the grower standing in front of the pack. The failed sativa grow usually goes back to a word that was understood in the wrong one of those senses: a flowering time read as a promise, a “sativa-dominant” label taken as a statement of effect, a landrace chosen as if it were a modern hybrid. The entries below were put together with the range at https://hazesativaseeds.com open as the concrete examples, since it leans strongly towards the long-flowering end of the spectrum and that is where the vocabulary matter most; the definitions though apply to any sativa seed from any seller. They are given in no special order, because not one of them makes usable on its own without the others.

Foxtailing

The tendency of some flowers to push out new calyx clusters on top of old ones, producing spired, irregular buds instead of round ones. In most tent-bred strains it is a heat symptom, usually caused by light too close or a room too high, and the standard response is to fix the room.

In many sativas, above all Thai and some Haze hybrids, it is built in and is going to happen under a perfect room. A new sativa grower often spends a month chasing a problem that was never not there, dropping lights and heat only delaying a slow flower even more. The listing seldom says which kind you should expect; the parentage usually does.

Latitude

The one figure that determines whether a sativa will ripen outdoors, and one that no pack prints. Equatorial lines need the autumn days to continue 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 else watches it rot in November. A closer to the equator, in a northern hemisphere, the later the season runs, and coastal and subtropical growers are able to ripen lines that temperate growers cannot.

The usable reading for a seed pack: an “outdoor” sativa harvest month is given for the breeder’s home latitude, normally somewhere within temperate Europe or the western United States, and every degree further north of it moves the finish later towards the weather. A grower north of about the fiftieth parallel that is after a true sativa in the garden needs to be shopping for an autoflower or a covered space, and not a better season.

Terpinolene (the “sativa smell”)

A aromatic compound found in high proportion in many old sativa strains and responsible for most of what growers describe as a “sativa” smell: green, piney, lemon and faintly sweet all at once. It is volatile, driven off quickly through hot drying, and it degrades more quickly during storage than the earthier terpenes that dominate indica-leaning stock.

For a seed buyer the word does two jobs. When a listing names terpinolene among the lead terpene, the strain probably has substantial Haze-era ancestry regardless of what the label says. And when the grower are after that profile to still be there to the jar, the cure has to be slow and slow; a warm drying room turns a terpinolene line to a flower that smells of hay and leaves nothing of what the pack described.

Hermaphroditism in long-flowering lines

The production of pollen-bearing flowers on a female plant, typically towards the end in flower and often under stress. Every cannabis population carries some tendency for do; sativa plants show it more, and the reason is one simple reason: fourteen weeks of flower is fourteen weeks of opportunity for a light leak, a temperature spike or a missed watering to trigger it off, and a plant that has gone beyond its intended end frequently produces a few late male sacs on its own in a final effort to set seed.

Not one of this means a sativa strain weak as a matter of course; it means the room’s discipline matter for a longer stretch. A sealed tents, stable conditions and cutting the moment the plant is ready and not two weeks after take away the greater part of the problem. A listing that states a breeder screens parents for hermaphrodite traits is worth worth hearing on a long-flowering line than for any else.

Sativa-dominant

A catalogue category rather than a botanical one. It usually indicates that the larger share of a hybrid’s parents are described as sativa by the breeder who drafted the description, which occasionally means no more than that the buds are airier or the smell sharper than the same breeder’s indica-labelled lines.

The experience people associate with a word, lively instead of sedating, is governed far more by terpene profile and the cannabinoid balance than by ancestry, and plenty of “sativa-dominant” releases deliver a heavy sleepy effect while a good number of indica-labelled lines do exactly the reverse. To a grower the label is worth something as a loose guide to growth habit, flowering time and stretch; as a guide to how it feels it is close to useless unless accompanied by the terpene notes.

Equatorial (the twelve-hour problem)

Describes lines from latitudes where daylength barely varies across the year, which means that the plant does not develop a strong reaction to shortening days. These plants often flower reluctantly under a standard twelve-hour light cycle, because twelve hours is, for them, a mild ordinary day and not a signal.

The practical fix, passed down among sativa growers over decades, is to cut the light more: eleven hours, occasionally ten, particularly during the final weeks. It costs a little yield and buys a more clearer finish. A listing which uses “equatorial” is telling you about this in one word, and a grower who takes it as mere geography misses the instruction hidden in it.

Stretch

The burst of vertical growth which comes after the switch to flowering. Indica-leaning plants gain around half their height again; sativas routinely double, and a few landrace types go further. The stretch lasts three to five weeks and will not be stopped once it begins, only bent sideways by training.

In tent terms, a stretch figure is a fact to reading ahead of choosing when to flip. A sativa flipped at sixty centimetres inside a two-metre tent is touching the lamp before week four of flower; one switched at thirty centimetres centimetres has room. People coming over from indica stock almost always switch far too late the first time, and the consequence is visible on the ceiling of the tent.

Flowering time

The number of weeks between the onset of flowering and maturity, which is the single most misread figure on a sativa pack. With photoperiod seed it is counted from the day the light drops to twelve hours, not from sowing, so a “fourteen-week” sativa grown after a eight-week vegetative period is a five-month plant. Breeders also quote the shorter end of a range, since the longer end sells fewer seed.

Long-flowering lines take everywhere 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 sorted by this figure, which is a reasonable first pass for a grower with a fixed schedule. A grower who allows four weeks on top of whatever the pack states is seldom disappointed.

Haze

Originally a particular line of plants bred in coastal California from Mexican, Thai and South Indian landraces, and later preserved and worked in the Netherlands. The Haze runs tall, branches sparsely, flowers for twelve sixteen weeks and smells of spice, pine and something sharp that no other line exactly reproduces.

In its looser sense “Haze” is whatever cross which carries some of that family, and today is most of the sativa-leaning catalogue. A listing that reads “Haze” and gives no lineage could be mostly percent the old family or a sixteenth of it, and the grow time tracks the fraction, not the name. The working question is never “is it a Haze” but “how much, and via which parent”.

Landrace versus heirloom

A population of plants shaped over centuries to one place by the local growers and growers together, and not by modern breeding. Colombian, Colombian, Malawian and Oaxacan stock are the classic sativa examples. A landrace is a spread, rather than a one plant: within a pack the flowering times, finishing times and smells range far more than any tent-bred line, and that variation is the point of keeping one.

The mistake is buying a landrace like a finished hybrid. It carries traits that make sense in an open field, such as height no tent can hold and a flowering clock tuned to a equatorial daylength the majority of growers cannot provide. “Heirloom” in a listing generally means a landrace that has been reproduced somewhere over a number of generations, typically with a degree of selection for indoor life; it is nearer to usable but nonetheless far from a hybrid. A seller listing “landrace” without a origin region and a reproduction history is using the word as a flavour, and the seeds should be judged accordingly.