Field Guides

Why the same strain can feel different

By SŌMA 7 min read Updated

You liked a strain, bought it again, and this time it smelled and felt different. Studies point to several reasons that can be at work at once: a strain name does not guarantee the same plant, the same plant grows differently in different conditions, flower keeps changing after harvest, and the effect depends on the amount and on the person as well.

It is also why SŌMA describes flower by its aroma, flavour and effect notes, not by its name alone. This guide's sources are listed at the end.

One name, different plants

A strain name is not a registered variety: in the United States, as the authors of one large study put it, there are no enforced rules for naming cannabis varieties. Cannabis is highly heterozygous, so many strains are grown from cuttings to keep their genetic identity, but names are given to plants grown from seed too, and seed can vary: one genetic study cites earlier work that found considerable variation among seeds of one strain from a single supplier. Growers pick a plant they like, the “mother”, and take cuttings from it; cuttings from one mother should differ little genetically.

Genetic studies bear this out. In one, samples with the same name were, in 6 of 17 comparisons, more like samples with other names than like each other. Another obtained 30 strains from 20 dispensaries or donors in three states and found that most strains had at least one sample genetically unlike the rest, including strains said to be sold only as cuttings; once those were set aside, many strains were genetically stable. Its authors could not tell where between seed and sale the differences arose, and list mix-ups, misspelt names and relabelling among the possibilities.

Chemistry varies the same way. In a six-state study of lab results for THC-dominant flower with terpene data, most strain names were more consistent in their terpenes from one producer's product to another's than chance would give, but how consistent a name was varied widely, and for some names it was no better than chance. The authors call strain names a better marker of a product's chemistry than the indica, sativa and hybrid labels, but “far from ideal”. More on those labels in Indica, sativa and hybrid.

The grower and the growing

What a plant shows, its phenotype, comes from its genes and its environment together. That holds for cannabis: one genetic study describes it as considerably variable and “extraordinarily plastic” in response to growing conditions.

Studies show how much the growing can move the result. In one, flowers from the top of the plant held close to twice the THC of flowers from the bottom, in both strains measured, and THC in the flowers rose as they matured, so the day of harvest matters too. In another, of tall plants, flowers low on the plant were lower in cannabinoids where less light reached them, and removing lower branches and leaves to let light in raised them.

Handling after harvest counts as well. In studies of hemp flower collected in a 2022 review, drying at higher temperatures kept less of the terpenes: in one, drying above 40°C significantly reduced them.

Different growers can mean different conditions. In one small study, cuttings of the same genetic stock grown commercially, one lot indoors under lamps and one outdoors in soil, came out with significantly different cannabinoid and terpene profiles in both cultivars tested, though the flowers looked alike. The six-state study notes that even clones can differ with growing conditions and preparation, and that it could not separate genetics from environment in its own data. We found no study of how much two growers' flower of one clone usually differs.

Each batch is its own

Each harvest is grown, cut, dried and tested on its own, so the factors above can differ from one batch to the next. In New York every batch or lot must be tested by a lab permitted by the Office of Cannabis Management (OCM), and the lab certificate reports the results for a sample of that batch.

Age and storage

Flower keeps changing after harvest. THC slowly breaks down: in one older study of plant material kept in the dark at room temperature, it fell on average by 16.6% of its starting value in the first year. Aroma compounds can change faster: in one laboratory study of a CBD-rich variety, they were down by more than half on average within four months, under every storage condition tested. That is one variety in one study, not a rule. More in Why freshness matters and How to store cannabis.

You, and how much

The same flower can also feel different to different people, and to one person at different times. THC is the main compound behind the high, and OCM notes that the amount of it in a product can change how it affects you, and that how soon effects arrive and how long they last varies from person to person. A review of human studies found that people who use cannabis regularly tend to feel a given dose less: the intoxicating effects were partly blunted with regular use.

What you can check

  • Treat the name as a starting point. OCM's consumer page lists the cultivar, or strain, name among the things to look at to understand how a product may make you feel, with the type of extract and the cannabinoid content.
  • Note who made it. A New York label names the processor and its licence number, and the Metrc Retail ID record names a licensed business behind the package; our QR code guide shows where.
  • Check the dates. A New York label must give an expiration date, not a harvest date. Where the package has a Retail ID, its record usually gives the packaged and test dates, and the harvest where one was entered; stock a shop received before 1 April 2026 may have no Retail ID at all.
  • Read what was measured: total THC on the label, and the terpenes on the lab certificate, which OCM's testing rules require for every final product, flower included. They describe the batch's sample on the day it was tested.
  • Keep your own notes on what you liked, by aroma and effect, with the grower and the dates, so you can tell one jar from the next.
  • With a new batch, start low and go slow: OCM advises waiting 5 to 10 minutes after one or two puffs before having more.

How handles names

SŌMA describes each strain in one shared vocabulary of aroma, flavour and effect, and where one name covers genuinely different plants, it records the name per grower, when it can tell whose plant it is. My taste, your profile, holds the aromas and effects you prefer and the strains you love, and Match compares a menu against it. More in How SŌMA works.

Sources

Frequently asked questions

Is a strain name a reliable guide to the experience?

Only loosely. A name is not a registered variety; genetic studies have found samples under one name that were unlike each other, and lab data show that some names are much more consistent than others. Growing, harvest, drying, age and storage change the flower further, and the effect also depends on the amount and the person.

What is a phenotype?

A plant's observable traits, such as its structure, aroma and chemistry, which come from its genes and its environment together. Plants grown from one strain's seed can differ genetically, and the same genes grown in different conditions can come out differently.

Why does flower from two shops sold under the same name differ?

It may come from different growers, different mother plants or different harvests, or from the same harvest kept differently since it was tested. A New York label names the processor, and where a package has a Metrc Retail ID, its record usually gives the packaged and test dates, so you can check some of this yourself.

How do I get a more consistent experience?

Note the grower and the dates as well as the name, read the measured figures on the label and the lab certificate, keep notes on what you liked, and start low with each new batch.

Corrections

  • We said you are not imagining it, that a strain name is a label on a wide range of real outcomes, and that this is the whole reason SŌMA matches on sensory qualities rather than names, because the aroma and effect you want are more reliable than the word on the jar; the guide's description called a name alone “a weak promise”. We had no source that aroma and effect notes are more reliable than a name. The guide now says what studies found about strain names, and describes what SŌMA does without that claim.
  • We said genetics set a range and cultivation decides where in it a plant lands, that light, nutrients, harvest timing, drying and curing shape the final aroma, potency and smoothness, and that two farms growing the same cutting can produce noticeably different jars. We found studies on light and position on the plant, harvest timing and drying temperature, and one small study of the same genetic stock grown indoors and outdoors; we did not source the claims about nutrients, curing and smoothness, or how different two growers' jars of one cutting usually are, and removed them. The guide now gives what those studies found and says what is not known.
  • We said most strains are a family of expressions rather than a fixed plant, that ten seeds of one strain may give several phenotypes with different aromas, structure and effects, and that the chosen mother plant determines which expression you receive. The guide now says what we could source: that one genetic study cites earlier work finding considerable genetic variation among seeds of one strain, and that cuttings from one mother should differ little genetically.
  • We said cannabis varies harvest to harvest the way wine varies vintage to vintage, through weather, the exact harvest window and small processing differences, so that this month's batch is not last month's. We found no study measuring one grower's strain from harvest to harvest and removed the comparison; the guide now says that each batch is grown, harvested, dried and tested on its own.
  • We said terpenes, the aromatic compounds that shape much of the experience, are volatile and fade first, so older or poorly stored flower can smell and feel muted. The storage studies we found that measured them each looked at a single variety or set of samples, and whether terpenes shape how cannabis feels is unsettled. The guide now gives that study's finding as one study's, and makes no claim about how stored flower feels.
  • We advised paying attention to aroma, freshness and the harvest date, said tracking sensory qualities is exactly what a taste profile is for, and in the FAQ that building a taste profile makes those preferences repeatable. We had no source for the last, and New York's label rules require an expiration date, not a harvest date; the guide now says where the packaged and test dates, and a harvest where one was entered, can be read, and calls SŌMA's profile by its name, My taste.
  • In the FAQ we defined a phenotype as a particular expression of a strain's genetics, said many strains produce several phenotypes varying in effect, and said two jars sharing a label will feel different. A phenotype is a plant's observable traits, from its genes and its environment together; we found no source on effects, and two such jars may differ, not will. The answers now say so.