Ultra Jack (Cannabis flos Canopy Growth): lineage from Jack Haze and a single source profile

• Who supplies. Exclusively Canopy Growth, so there is nothing to compare versions, and a supply break means no availability of this strain, not another version of it.
• Profile. Myrcene leads, alongside farnesene, ocimene, terpinolene. We do not provide percentage shares, as sources calculate them against different totals.
• Origin. The lineage is established, with parents being Ultra Sour and Jack Haze.
• What is missing. The profile describes a single source, so there is nothing to compare it with.

What is Ultra Jack and where does it come from?

Ultra Jack is a cannabis cultivar described by the breeder as a cross of Ultra Sour with the Jack Haze strain. The lineage is provided by the official 7ACRES website, a brand owned by Canopy Growth, so it comes from the producer, not from a database maintained by an intermediary. In Polish pharmacies, it is available under the Spectrum Therapeutics brand.

One of the parents is listed in the same grouping as the offspring. Jack Haze is traded in Polish pharmacies under the commercial name Red No 2 and has its own text in this cluster here. The second parent, Ultra Sour, does not have an entry here, as it has not appeared in any pharmacy position we counted. The lineage is therefore fully known but only half verifiable: one ancestor can be read separately, while the other leaves only the name.

With this position, the word sativa is also mentioned, and it is worth knowing where it comes from. It was entered by one Polish strain database, repeating the classification used in seed trading. It describes the plant’s growth habit, not the composition of the delivered dry flower, so a patient reading this word does not learn what to expect from a specific batch. We treat it here as a catalog label, not as pharmaceutical information, and do not draw any conclusions about its effects.

Which producers supply Ultra Jack to Polish pharmacies?

One. In the grouping where this cluster stands, Ultra Jack appears exclusively as a position of Spectrum Therapeutics, the medical brand of Canopy Growth. The registered name is Cannabis flos Canopy Growth, and it is this name, not the strain name, that identifies the raw material dispensed by prescription in the pharmacy.

The full registered name carries a number in the middle: the declared THC content added to the trade name. We do not transcribe it here, as the source provides only the declaration, without the tolerance accepted by the producer. The declared value refers to the batch, not to the jar that the patient receives at the counter, so the quoted bare number promises accuracy that no one has measured. What is in a specific package is stated on its label.

One supplier means ordinary organizational risk for the patient. With a strain from five producers, the absence of one position in the wholesaler can be compensated by another, but here a supply break excludes the entire name. We therefore keep the current state of the assortment in one place, in the list of strains available in Polish pharmacies, not in the descriptions of individual cultivars: the list changes faster than we can correct eighty-some pages. Separately, we describe what Spectrum Therapeutics supplies beyond this one position. It is also worth remembering that pharmacy raw material Rpw and the store category dry flower are two different things, dispensed in a completely different manner.

What does Ultra Jack smell and taste like?

• farnesene farnesene
• myrcene myrcene (leading in the pharmacy list)
• ocimene ocimene
• terpinolene terpinolene

Citrusy, spicy, and earthy, if we believe the only Polish database that describes this cultivar at all. These are three scent descriptions, not measurements: no one provides who smelled it, how many samples passed through the hands of evaluators, or from which batches they came. The second database, which we compare with other strains, has no entry here.

We provide the profile composition as it stands with the data provider: farnesene, myrcene, ocimene, and terpinolene, without shares. This list comes from a single source and should be read as such. It cannot be said that the composition has been confirmed; it can only be said that it has been recorded once. The scent can also be a misleading guide to the composition, as the nose picks up compounds present in trace amounts while passing indifferently by those that are most abundant.

We do not transcribe percentage shares and have evidence taken from this very position. The database assigns exactly one-fourth of the profile to all four compounds, meaning it provides an equal distribution instead of a measurement, and the sum then comes out round to the unit. The same distribution repeats in thirteen of the one hundred forty-five described positions there, and the sums themselves vary in this collection from a dozen to one hundred twenty-five. A number that sometimes stops at one hundred and sometimes exceeds it does not describe the share in the whole, only the method of filling the table.

How long does it take for Ultra Jack to take effect and how long does the effect last?

After a few minutes if the raw material is vaporized, and much later if it goes into the digestive tract. The route taken by the substance in the body determines this, and it does not change with the name on the package. Ultra Jack has no own measurements here, as no one has published such.

The method of administration determines the course more than the strain itself, and the ranges below describe it, not this cultivar, as pharmacokinetic studies for a single cultivar have not been published.

For this position, there would be one more limitation. It comes from one producer and one production line, so even if someone measured the course in volunteers, the result would describe a specific batch and the method of processing used, not the name on the jar.

What is known and what is not known about the effects of this strain?

Nothing is known about the strain from studies: there is no work that has taken Ultra Jack as a subject. However, it is known what has been shown for myrcene, the compound indicated as leading in the description of this position, and all three studies we cite here were conducted on mice.

The earliest concerns pain.

In humans, it has not been shown that myrcene alone alleviates insomnia at doses typical for inhalation of dry flower. The direction of the effect in rodents depends on the route of administration and sex: after intraperitoneal injection in 2002, a slightly anxiogenic effect was described, while after inhalation in 2024, an anxiolytic effect was observed in females. These two results do not cancel each other out; they simply show that the conclusion depends on conditions that no popular strain database provides.

The rest of what can be read about this position is catalog material. The database summarizes possible effects in one word, calling it stimulating, and such a term has neither a trial involving humans nor a measurement on animals behind it. Patient reports circulating on forums also do not change the state of knowledge: they describe individual experiences that no one has compared with a batch of raw material or an accepted dose.

What side effects have been reported from this strain?

None, because no one collects them under the strain name. Ultra Jack is a single position from one producer in Polish trade, and yet a report goes to the database under the name of the medicinal product and the batch number. The description below therefore concerns cannabis flower, not that one jar.

Reports of side effects are collected for the medicinal product with a batch number, not for the strain name, so the following concerns cannabis flower as a group of raw materials. The most commonly reported are dry mouth, red eyes, and increased heart rate. Less frequently described are dizziness upon rapid standing, daytime drowsiness, and temporary worsening of short-term memory, as well as anxiety increasing with the dose. A separate issue is medications taken concurrently, especially sedatives and those affecting coagulation: their assessment requires knowledge of the entire list of preparations, not just the description of the plant. We do not provide the frequency of these symptoms numerically, as public compilations for cannabis flower in Poland do not separate them by individual products.

One caveat applies to this position more than others. The catalog description promises a stimulating effect, and with such an expectation set, it is easy to mistake one’s own anxiety from too large a dose for a property of the plant. A symptom increasing with the dose remains a symptom, regardless of what the label in the strain database promises.

How to vaporize this strain?

Lower than the terpene list suggests, as the lowest boiling compound from this set evaporates around one hundred sixty-seven degrees. The vaporizer setting is not the temperature of the dry flower, so each number from the table describes a pure compound in the laboratory, not the content of the chamber.

Three of the four compounds have boiling temperatures in the database, the fourth does not have it at all: for farnesene, the query for the compound card ends with an error message instead of a number, and we do not fill in an empty field with guessing. The discrepancy is also visible within one position, as terpinolene has two different values in two records, separated by a few degrees. All three readings fall within a narrow window, from one hundred sixty-six to one hundred eighty-seven degrees, so no equipment setting will separate these compounds sequentially: with one pass through the material, some of them will evaporate together.

Why temperature tables can contradict themselves, we explain separately, just as we explain how the equipment setting differs from what happens in the chamber. The practical conclusion is modest: lower settings leave more volatile compounds in the material, while higher ones extract more and faster, depleting the portion. None of these numbers tells how much of what will remain in the vapor, as no one has measured that for this strain.

Which strains are related to it?

None available in Polish pharmacies, although the pedigree chart shows something different with this name: Jack Haze is not a sibling of Ultra Jack, but its parent, and it stands in pharmacies under the name Red No 2. The kinship goes up here, not sideways.

The second parent, Ultra Sour, has no entry in this collection nor any other offspring, so there is nothing to refer to. The reverse record is also silent: none of the eighty-five strains in the cluster indicates Ultra Jack as its parent, which means that there is currently no offspring of it in Polish pharmacies. An empty sibling list is not a data gap here, but a result: we know the lineage, it simply does not lead sideways.

The common term in the name is more evident with this strain than elsewhere. The word Jack is carried by three positions in the cluster. Jack Herer descends from haze, northern lights #5, and shiva skunk, while Jack Haze was created by crossing white widow with haze. Therefore, the commonality is often just haze, which is a broad family of style, not an identified cultivar, and sharing such an ancestor does not make two names siblings. Ultra Jack is connected to Jack Herer solely by the term in the name, which means nothing when selecting raw material by prescription.

Frequently asked questions about the Ultra Jack strain

Is Ultra Jack a sativa strain?

Yes, it was entered by one strain database, but this term comes from seed trading, describing the growth habit of the plant. It says nothing about the composition of a specific batch of dry flower and does not replace the result of batch testing.

How many producers supply Ultra Jack to Polish pharmacies?

In our grouping, one: Spectrum Therapeutics, the medical brand of Canopy Growth. The registered name of the position is Cannabis flos Canopy Growth, and we keep track of current availability in the strain list, not in this text.

Why do you not provide the THC content of this strain?

Because the source provides only the declared value, without the tolerance accepted by the producer. A number transcribed without this margin looks like a batch measurement, but it is not. The content of a specific package is stated on its label.

Which terpenes does the source mention for this strain?

Farnesene, myrcene, ocimene, and terpinolene, without division into shares. The set comes from one database, and the second database, which we compare with other strains, does not describe this cultivar at all.

Is Ultra Jack related to Jack Herer?

No. The parents of Ultra Jack are Ultra Sour and Jack Haze, while Jack Herer comes from different plants. The common term in the name is not evidence of kinship in either direction in this collection.

Are there any studies on the Ultra Jack strain itself?

There is not a single study that has this cultivar as its subject. Available studies concern individual terpenes, primarily myrcene, and were conducted on animals, so we cannot draw conclusions about the strain from them.

Cannabis flower is a pharmaceutical raw material dispensed by a doctor’s prescription in the Rpw category. The material is informational in nature, describing the state of available data and does not replace the advice of a doctor or pharmacist. The editorial text was prepared by the editorial team of ubucha.pl.