To put it bluntly, only a scientific misunderstanding could make “indica” and “sativa” synonymous with “in the couch” and “up and doing things,” respectively. The reality is much stranger. Most cannabis plants grown in the western world over the last few decades have been hybrids between the two, but the categories themselves are based on a handful of observable genetic and morphological differences that tell a different story entirely.
The consumer version of this debate is basically settled
If you have read anything about cannabis genetics, you might have come across the 2015 study by Sawler et al. in PLOS ONE, which sequenced the DNA of 81 commercial cannabis strains and determined that around 63% of them could not be categorized as either pure sativa or indica, since they carried both in their lineage. This wasn’t a one-time occurrence or exclusive to a small sample group; anyone who had been breeding weed for the past few decades could’ve told you the same thing, and unofficially did.
That’s because, whether you’re talking about a lab with gene sequencers or a pot grower with a closet full of sinsemilla plants, decades of crossing strains for yield, potency, and resistance to mildew and mites has long since eliminated whatever clear distinction once existed between tall, narrow-leafed sativas and short, broad-leafed indicas. Plants three or four generations removed from a hybrid of pure examples of both will still be crossed with other plants that are ostensibly sativa or indica – they just don’t breed true, at this point. A strain marketed as “90% sativa” or “indica-dominant” will likely still trace a good portion of its ancestry to plants with the other genotype. They’ve kept the names because they sell the product and it’s what the plant or seed was originally marketed as, not because these labels map anymore onto the actual lineage.
For the consumer standing in a shop, weighing an “energetic sativa” against a bedtime indica, this all seems arcane. And it is. But it’s also important. Your label doesn’t mean what you think it means. Two “sativa-dominant” flowers from different breeders or grow operations can feel markedly different; whatever concrete cocktail of terpenes and cannabinoids and flavonoids that was present in the original plant has more of an effect on you than some rule of thumb mnemonic attached to the baggies at the seed bank. Myrcene pushes you towards the couch, limonene or pinene the other way. These and other compounds are part of what is presumably the entourage with the THC and CBD, and that’s what alters the high.
Why growers can’t just drop the terminology
But first, a quick physiologic detour. The traits central to the sativa/indica conversation are about more than plant architecture. The other major factor is flowering time and photoperiod response. Broadly speaking, cannabis is a photoperiod plant: It relies on changes in light or darkness to trigger flowering. Indicas, which evolved at higher latitudes in Central Asia, have a shorter window in which they can reliably pass on their genes. When they grow in the Hindu Kush, where cannabis indica plants are from and where the photoperiod drops fast, they have to race to set seeds before winter. That didn’t leave much time for growing tall and bushy. They flower quickly and profusely, no matter their size.
Since the longer vegetative phase can also drive stronger upward growth, vertical space becomes another consideration. A sativa-adapted stretch can easily double a plant’s height, especially during the first few weeks after triggering flower. If indoors, be prepared with enough room between your lights and the canopy (easy to accommodate if that growroom is, say, a full warehouse, rather more challenging if you’re an enterprising home grower popping some beans in a closet or tent). Outdoor growers meanwhile can time their season carefully – starting inside with supplemental lighting, for instance, to get past those initial vulnerable weeks – or choose to cage, screen, or string their plants and gently train the height horizontally, creating a flat canopy while keeping the vertical potential in check.
When it comes to appearance and morphology, sativa-dominant species often provide the most recognizable and classic cannabis shape, structure, and leaf patterning. They can also, depending on just how dominant the sativa genetics in the cross are, be more difficult to manage, especially for those new to cannabis cultivation.
That’s primarily because these plants inherited from their jungle ancestry a strong drive to outgrow and overshadow any competition for sunlight and survival. All that speed and stretch and open node spacing that veteran growers admire for its adaptability to outdoor growing and its ability to fill a space for high light exposure growing in a warehouse, becomes a liability indoors if the potential size or height of the plants wasn’t properly planned for. This is why it still makes sense to view the sativa collection when the goal is matching a plant’s physical growth pattern – height, stretch, node spacing – to the actual dimensions of a grow space, rather than chasing a specific consumer effect that the genetics can’t reliably promise anyway.
Hybrid strains often have more predictable and stable feeding needs. They grow at a good balance of the sativa and indica types’ rates, and their metabolism and appetite tend to reflect that compromise. If you over- or underfeed your plants during any of the general growth phases, they’re likely to suffer less than if you had a much more lopsided genetic profile. Resilience in adapting to the feeding program is a big advantage for many newer growers, especially because we often end up pushing our nutrient regimen to the limit in pursuit of maximum yield.
There is a less obvious yet tangible distinction in how these plant types uptake nutrients early on in veg, too. Narrow-leaf sativa phenos will often display a differing sensitivity to nitrogen when compared to their broad-leaf relatives, and inadvertently nudging too much N too quickly in the early stages can fuel the stretch the genetics will already express. Every grower who has effectively been evicted by a spindly sativa-dominant leaseholder will have pinpointed part of the issue to feeding a blanket indica-dominant strategy, where, in terms of metabolism and canopy, the rules are just different. It’s not sexy information, but matching feeding strategy to plant type is exactly the type of nuance that separates a strain from a train wreck.
The yield and workload angle nobody markets
There is a discussion related to this topic that rarely appears in consumer-focused content: how the indica/sativa classification can be an indicator of the work and yield characteristics of the crop itself. Indica plants tend to produce dense colas, while sativa plants often develop lighter and airier flower clusters. The more specific genetic terms landrace, heirloom, and hybrid make no such implications.
If you grow, that distinction is not trivial. Dense colas take more time to manicure, but less to dry. Light, fluffy buds maybe lack some bag appeal but can be knocked out of a plant in no time. As the genetic breeding frontier advances, we’re gaining indica-dominant plants with ever-looser structures and sativa-dominant ones with increasingly better colas. Generally, though, it’s still a reliable way to estimate how many hours you (or your hired trimmers) are going to spend squatting over a table.
Where chemovars fit into the picture
The industry is now increasingly descriptive of finished flower by its chemovar, its actual measured cannabinoid and terpene profile, rather than by its lineage. This seems to be the most helpful description of final product possible for the consumer, and anyone else hoping to accurately predict its effects. A chemovar-based description tells you what is truly in the jar, rather than what distant relatives the plant came from.
But that kind of description can only be made after the plant has been harvested, dried, cured, and finally sent to a lab to be dissected. A farmer planning what to put in soil several months earlier in the year doesn’t have the benefit of so much information. Seeds do not come with terpene reports. What they do come with, at least from a good breeder, are suggestions that the plant will grow tall (sativa) or stay short (indica), finish its flowering cycle quickly (indica), or take its sweet time (sativa). These suggestions have a lot to do with growth pattern and structural tendencies based on the plant’s place in the indica/sativa framework. Two ways of organizing the world are not in competition if they are solving a different problem at different points in the process. The answer to “what will this most likely do to a person” is not in conflict with “what will this do in my grow room.”
Choosing seeds like a grower, not a customer
The overall message is direct, even if it contradicts much of the information about “which one gets you higher” that is available. When you’re making a choice about seeds, the indica/sativa classification does matter, but not for the reason most advertisements would have you believe. You should consider it as an indicator of height, stretch, flowering window, and climate tolerance. Then, see if those characteristics match the space you have available, your outdoor latitude, or your tolerance for longer vegetative and flowering periods.
Trying to achieve a specific high based on the indica/sativa categorization is a game you won’t win, and the genetic research makes that clear. But if you discard the entire concept, you’re also throwing out a very useful cultivation tool with the marketing hype. The wise approach is to use these categories in the same manner that successful cultivators already do: as a type of farming shorthand, not a guarantee of the effects.
