A moon rock is a bud dressed up with concentrate and kief, and an infused pre-roll is a joint with extra concentrate or kief inside or outside it. Both are meant to be stronger than plain flower. Here is how each is made, how they are labelled in Canada, and where the line sits between what is sold here and what is mostly a US-market product.
What are moon rocks?
Moon rocks (also written moonrocks, or called moon rock weed) are whole cannabis buds that have been dipped or brushed with a thick cannabis oil or distillate and then rolled in kief, the powdery trichome dust that collects from dry flower. The result looks like a small, sticky, sparkly nugget, which is where the name comes from.
The idea is to stack three sources of THC in one piece: the flower itself, the added concentrate and the kief on the outside. A moon rock is usually broken up and smoked in a pipe or bong, or crumbled into a joint, rather than lit whole.
Because the added layers are concentrated, moon rocks are generally much stronger than the bud they started as. The exact potency depends on the bud, the oil and how thickly everything is coated, so there is no single typical number.
What are sun rocks and other "rocks"?
There is no standard definition for sun rocks. The name is used in a few ways: for a moon rock variation with a different concentrate or a different coating, for a similar product sold by a specific producer, or just as another name for the same idea. If you see the term, check the ingredient and THC information instead of assuming what it means.
Other names get used in the same family, such as caviar or "dipped" buds. They follow the same basic recipe: flower plus concentrate plus a dusting of kief or another extract. The label, not the nickname, tells you what is in the package.
What is an infused pre-roll?
An infused pre-roll is a pre-rolled joint made with added cannabis concentrate, kief, or both. The concentrate can be mixed into the flower, coated on the inside of the paper, or wrapped around the outside. Some are rolled in kief the way a moon rock is. Others have a core of hash or oil running through the middle.
The point is the same as a moon rock: more THC per gram than a plain joint of similar size. It is the easier version, because it arrives ready to light and does not need a grinder or a bowl. For how joints differ from other rolled formats, see our guide to spliff vs joint vs blunt.
How do regular pre-rolls, infused pre-rolls and moon rocks compare?
Regular pre-rolls are the baseline: ground flower in a paper. Infused ones add extract. Moon rocks are the most concentrated of the three because the whole nug is coated.
For more on the concentrates behind these products, see rosin, live resin and distillate and kief and trichomes.
| Regular pre-roll | Infused pre-roll | Moon rock | |
|---|---|---|---|
| What is in it | Ground dried flower | Ground flower plus concentrate, kief, or both | Whole bud, oil or distillate, kief coating |
| Ready to light? | Yes | Yes | No, break up and pack a bowl or joint |
| Potency compared with flower | Same as the flower used | Higher, from the added material | Highest of the three, in general |
| Class in Canada | Dried cannabis | Cannabis extract product when kief or concentrate is added | No set category here; an extract-coated bud follows the same logic |
| How THC is shown on a Canadian label | Total THC, often per pre-roll | Total THC, as the regulations require for the product | Not a common legal product here |
Are infused pre-rolls legal in Canada?
Yes, a licensed producer can sell them, but they sit in a different class than plain flower. Health Canada has said that a pre-rolled joint fortified with kief is a cannabis extract product, not dried cannabis. Kief, hash and similar products made by mechanical methods are also cannabis extracts.
That matters for the producer. Selling a cannabis extract to a provincial retailer takes a processing licence that includes authorization to sell extract products, and the product is regulated under the extract rules for packaging, labelling and testing. Infused pre-rolls on a legal shelf have gone through that route.
Extract products also carry package limits set by Health Canada. When the extract rules came in, the total THC in a package of a cannabis extract was capped at 1,000 mg. That is a producer rule and not something you need to manage, but it is why you may see small pack sizes.
How is THC shown on infused products in Canada?
The Cannabis Regulations require the front of the package to show the Total THC, not just THC. Total THC includes the THCA that turns into THC when heated, so it reflects what the product could yield. Our guide to THCA vs THC explains the maths.
Health Canada allows Total THC to be shown in several ways: as milligrams per gram, as milligrams per unit, or as the total in the package. For dried cannabis the figures must reflect the tested lot, and values that come from a historical average of the strain do not meet that requirement. Pre-rolls are often shown in milligrams per unit, so you can see what is in each joint.
Do not compare an infused product's number directly with a bag of flower without checking the units. A percentage or mg per gram describes concentration. A milligrams-per-pre-roll figure describes the amount in a whole joint. For the rest of the panel, see reading cannabis labels.
Are moon rocks legal in Canada, and what is US-only?
"Moon rock" is mainly a US market name. It does not appear as a product class in the Cannabis Regulations. In Canada the question is how a product is classified: flower coated with an extract and kief would be handled as an extract product by the same logic Health Canada applies to kief-fortified pre-rolls. A licence holder needs the right authorization to make and sell it, and the product has to meet the packaging and labelling rules.
In practice, that means a moon rock bought from a legal Canadian retailer, if one exists, has been through that system. A product from an unlicensed seller has not, and its strength, ingredients and testing are unknown. A "moon rock" sold online or by a person with no licence is not part of the legal market.
In the United States, legality is set state by state, and products like moon rocks are sold in some licensed state markets and not others. Rules on what can be coated on flower, and how potency is declared, also differ by state. If you are travelling, remember that crossing a border with cannabis of any kind is not allowed in either direction.
Possession limits still apply. A concentrate counts as much more than flower toward the 30 g public limit, so a heavy product can use up your allowance faster than you expect. Our weed measurements guide has the Schedule 3 table.
What should you know before trying a stronger product?
Start with a small amount and wait. Stronger products can bring on unpleasant effects more quickly, including the feeling described in our greening out guide. Health Canada's general advice for any cannabis product is to start low and go slow, and to avoid mixing with alcohol.
Read the Total THC and the unit it is shown in before you light up. A single infused pre-roll can hold a lot more THC than a plain one of the same weight, and a bowl packed with a moon rock is stronger again. If you are new to these, the safer move is the lower number.
Sources: canada.ca, canada.ca, canada.ca, laws-lois.justice.gc.ca