Nearly every guide to indoor and outdoor cannabis is written for someone deciding how to farm. They weigh electricity bills against weather risk, count harvests per year, and settle, sensibly, on the greenhouse as a compromise. Useful if you own land. Most of us own a jar.

This page is for the person at the counter with two jars of the same cultivar in front of them, one priced well above the other, and a budtender who says one is indoor and one is outdoor and leaves it there. The flower will tell you a good deal before anyone else does. And the method matters in narrower, more predictable ways than the price gap suggests.

The methods, briefly

Indoor flower grows in a sealed room under lamps, with light, heat, humidity and feeding all set by the grower, and it can be harvested in any week of the year. Full-term outdoor goes into the ground in spring and comes down in autumn. Once.

Greenhouse flower lives under the real sun with a roof over it. Most of what reaches good shops from greenhouses is light dep, where a blackout tarp pulled over the plants each evening fakes an early autumn and lets a farm bring in two or even three crops a season. Our guide to sun-grown cannabis covers the farming side, including the mixed-light houses that switch on lamps when it clouds over. What interests us here is what each method leaves behind in the bud.

What indoor looks like

Indoor flower is built for the display case. The buds tend to be compact and heavy for their size, close to uniform from the top of the jar to the bottom, and frosted so thickly that the green underneath reads as pale. Stems are thin. Held up to the light, a good indoor bud looks almost manufactured, which some buyers love and some find faintly suspicious.

The frost is real resin. A sealed room with no wind and no rain has had every chance to keep it on the plant, and our page on cannabis trichomes explains why that resin is most of what you are paying for. The catch is in the nose. Indoor flower often leads with one very loud note, the gas or the candied citrus that made the cultivar famous, and then goes quiet behind it. A spotlight on a single actor.

What outdoor looks like

Full-term outdoor buds are larger and looser, sometimes much larger, on fat stems that took a whole summer of wind to build. The color runs darker, toward olive, and on cultivars with the genetics for it, into deep purple and burgundy. That color is autumn at work (cool nights late in the season bring it out, as our page on why some cannabis is purple explains). The frost is there but thinner to the eye, and the THC figure on the label is often a few points below the indoor jar beside it.

Then smell it. Good outdoor flower is wider. The headline note is still present, with a layer of quieter material underneath, cedar perhaps, or something like cold black tea, that keeps arriving after you thought you had the whole picture. We think this is the best thing cannabis does, and the easiest thing to miss if you shop with your eyes.

Outdoor flower sometimes brings a little of the field home with it.

Light dep sits in between

Light dep is the hardest to call by sight, and that is mostly a compliment. A strong light-dep harvest has much of the density of indoor with some of the color and range of outdoor, and because the farm can time its crops to finish before the weather turns, it dodges the autumn rain that keeps full-term growers in Humboldt and Mendocino checking the forecast every October morning. We have had light dep that rivaled the best indoor in the room. We have also had light dep that tasted of the tarp.

When there is a visual tell, it is a slight sun-bleaching on the uppermost buds, with stems somewhere between the two extremes in thickness. Usually there isn’t one. Ask.

Clues that mislead

A ragged, clipped look says more about the trim than the garden. Big farms run trimming machines, indoor and outdoor alike, and save the hand work for their best lots. Our comparison of hand-trimmed and machine-trimmed flower shows how to spot the blades.

Deep purple on an indoor cultivar that is not known for it usually means someone turned the room cold. Thin frost can mean outdoor, or it can mean indoor flower that was dried too hard and shed its resin heads in the bag, which a gentle squeeze will reveal (our guide on telling if cannabis is cured walks through it). Seeds point in both directions. In outdoor flower they are often wind-blown pollen from a farm three ridges over, forgivable once. Pale seeds scattered through an indoor jar mean the pollen came from inside the sealed room, which our page on seeds treats as a much more serious sign.

The calendar matters more than the method

Indoor rooms harvest all year. Outdoor comes down once, in October, and spends weeks in the dry and the cure, so the first properly finished jars of a new vintage reach good shops around late November and December. By the following July, that same outdoor flower has sat in storage for most of a year, and the bright aromatics that made it worth seeking out have faded. An indoor jar packed in June will usually beat it on the nose, and it is not close.

We buy by season. Full-term outdoor from December into spring, while the vintage is young. Light dep through the summer and early autumn, since those farms can bring crops in long before the full-term fields are ready. Indoor whenever the date on the jar is recent and the smell agrees with it. The method on the label tells you how the plant lived; the harvest date tells you how long ago it stopped living, and in our experience that second number decides more evenings than the first.

What the price gap pays for

Indoor costs more to make. Lamps run for months, and so does the air conditioning fighting their heat; one 2021 study estimated that a single kilogram of American indoor flower can carry several tonnes of carbon emissions. Some of that bill lands on the shelf. Outdoor at the same price as indoor is often the better jar, and outdoor priced well below it deserves a second sniff before you walk past.

At the counter

Ask whether the jar is indoor, full-term outdoor or light dep, and, if it came from a greenhouse, whether lamps were added. Ask which farm. Then ask for the harvest date, and if the budtender has to go looking for it, wait while they do. When the jar has no harvest date at all, the lab sample date on the certificate of analysis is the next best thing, and our guide to reading a cannabis COA shows where to find it. A shop that sorts its menu by THC percentage alone has told you what it thinks you are buying.

Our position

From December to about April we will choose a fresh, well-cured outdoor jar over almost anything else on the shelf, and we will happily pay indoor prices for one from a farm we trust. After that we start reaching for light dep. Indoor gets a fair hearing from any grower willing to print the date. The method is where the conversation starts, and the farm and the calendar are where it ends, which is the same lesson our piece on phenotypes arrives at from the genetic side.

Indoor vs Outdoor Cannabis, Read From the Jar