Sativa seeds arrive with more jargon around them than any other category of cannabis seed, and a good deal of it means 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 read in the wrong one of those senses: a flowering time taken as a fixed number, a “sativa-dominant” tag read as a statement of character, a landrace chosen as if it were a modern hybrid. The entries below were written with the range at https://hazesativaseeds.com open as reference, since it runs strongly to the classic end of the category where the words matter most; the meanings though apply to any sativa seed from any seller. They are in no special order, because not one of them makes sense without the others.
Sativa-dominant (the label)
The marketing term rather than a measurable one. It generally means that the larger share of a hybrid’s parents were described as sativa according to the breeder who drafted the listing, and occasionally signals no more than a certain the flowers are longer or the smell brighter than the that breeder’s indica-labelled lines.
The experience people associate with a word, clear-headed instead of heavy, is driven far more by terpene chemistry and the cannabinoid balance than it is by ancestry, and a good number of “sativa-dominant” hybrids deliver a flat sleepy effect and plenty of the opposite lines do exactly the reverse. For 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 next to useless without the terpene notes.
Terpinolene
A aromatic compound present in high amounts in a lot of classic sativa strains and accounting for most of what growers mean as the “sativa” smell: fresh, piney, citrus and slightly floral all at once. It is fragile, driven off quickly through hot drying, and it fades more quickly during storage than the heavier terpenes that dominate most tent lines.
For a seed buyer the word does two jobs. Where a listing names terpinolene as the leading aromas, the strain probably has substantial Haze-era genetics 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 slow and cool; a warm dry turns a terpinolene sativa into a flower that smells of very little and leaves no trace of what the pack described.
Haze (the family, not the smell)
Originally a particular line of plants bred in 1970s California from Mexican, Colombian and Thai landraces, and later preserved and refined in the Netherlands. The Haze grows tall, branches sparsely, flowers for twelve to sixteen weeks and carries a scent of spice, pine and something metallic that no other line quite has.
In its second sense “Haze” is whatever hybrid which carries some of that family, which by now is a great many of the sativa-leaning market. A listing which says “Haze” and gives no parents may be eighty percent the old family or one small fraction of it, and the flowering time tracks the share, not the name. The working question is not “is it a Haze” but “how much, and through which parent”.
Latitude (outdoor sativas)
The one number that determines if a sativa can ripen outdoors, and a number that no pack prints. Long-flowering lines require the run of shortening days to go on long enough to let the plant finish; at northern latitudes the frost comes before that, and the grower cuts an unripe plant in the end of October or loses it rot in November. The further south, within a northern hemisphere, the longer the season stretches, and Mediterranean or low-latitude gardens are able to ripen lines that northern gardens never will.
The practical rule of a seed listing: an “outdoor” line finishing date is stated for the breeder’s home latitude, normally somewhere in temperate Europe or the western United States, and every degree north of that pushes the finish back into the frost. A grower north of about the fiftieth parallel who wants a true sativa outdoors needs to be shopping for a sativa autoflower or a greenhouse, and not a better summer.
Hermaphroditism in long-flowering lines
The appearance of pollen-bearing flowers on a female plant, typically towards the end in flower and frequently under stress. Almost every cannabis line has a degree of capacity for it; long-flowering lines express it more, for a simple reason: sixteen weeks of flower is sixteen weeks of exposure for a timer leak, a temperature spike or a late watering to set it off, and a old plant has already waited beyond its intended end frequently throws a few late pollen sacs on its own as a final effort to set seed.
Not one of this makes a sativa strain unstable as a matter of nature; it makes the grower’s consistency matter over longer. A sealed room, steady conditions and cutting the moment the plant is ready and not a weeks later take away most of the risk. A listing which mentions the breeder screens parents for hermaphrodite tendency is worth more for a sativa than on anything other category.
Foxtailing (and when it is not a fault)
The habit of certain flowers to grow fresh calyx growth on top of old ones, giving spired, irregular buds instead of dense ones. In the majority of indica-leaning strains it is a stress symptom, typically caused by light too close or temperatures that is too high, and the standard response is to correct the cause.
In many sativas, above all Southeast Asian and certain Haze lines, it is built in and will occur in a flawless room. A first-time sativa grower frequently wastes a month hunting a problem that is there, lowering lights and temperatures and slowing an already slow plant further. The listing rarely warns which type you should expect; the parentage usually does.
Flowering time (and what it is counted from)
The number of weeks between the start of flowering and maturity, which is the single most misread number on a sativa pack. For photoperiod seed it is measured 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. Breeders also give the shorter end of the spread, since the longer end sells less seed.
Long-flowering plants run everywhere from ten weeks to more than twenty, and the longest strain in the Haze Sativa Seeds range comes in at around 16 weeks from the flip. The catalogue can be filtered by that figure, which is a reasonable first step if you have a room with a fixed timetable. A grower who allows four weeks on top of the figure the pack says is rarely disappointed.
Landrace
A population of plants shaped over centuries to a particular place by local growers and growers alike, and not by modern breeding. Thai, Colombian, Congolese and Mexican stock are the classic sativa cases. A landrace is a spread, not a one plant: within a pack the flowering times, flowering times and smells spread widely than a tent-bred hybrid, and this variation is the point of growing one.
The trap is treating a landrace as a finished hybrid. It carries traits that make sense in an open field, such as height that no tent can contain and a flowering rhythm set to a equatorial daylength the majority of growers never provide. “Heirloom” in a listing generally refers to a landrace that has been grown out away from its origin over a number of generations, typically with light selection for tent life; it is closer to usable but still not uniform. A shop listing “landrace” that does not give an origin region and a reproduction count is using the word loosely, and the pack should be judged with that in mind.
Stretch (the doubling)
The surge of vertical growth that follows the change to flowering. Most tent-bred plants gain around half again; sativas routinely double, and a few landrace lines go further. The stretch continues two to four weeks and will not be halted after it begins, only bent sideways by training.
In tent terms, the stretch multiplier is a number worth read ahead of deciding when to switch. A sativa switched at sixty centimetres centimetres in a standard tent is at the lamp before week four of flower; one flipped at thirty centimetres has room. Growers coming over from indica strains nearly always flip too late the first time, and the consequence is written on the ceiling of the tent.