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

What is Ultra Jack and where does it come from?

Ultra Jack is a cannabis cultivar described by the breeder as a cross between Ultra Sour and Jack Haze. The lineage is provided by the official 7ACRES website, a brand owned by Canopy Growth, so it comes from the manufacturer and 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 appears in Polish pharmacy circulation under the trade name Red No 2 and has its own text. The second parent, Ultra Sour, does not have an entry here because it has not appeared in any pharmacy product that we counted. The lineage is therefore known in full, but verifiable only halfway: one ancestor can be read about separately, while only the name remains for the other.

This entry also mentions the word sativa, 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 supplied dried 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 listing on which this cluster stands, Ultra Jack appears solely as a product 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 because the source provides only the declaration, without the tolerance accepted by the manufacturer. 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 manufacturers, the absence of one product in the wholesaler can be compensated by another, but here a supply interruption excludes the entire name. We therefore keep the current inventory status in one place, in the list of strains available in Polish pharmacies, not in the descriptions of individual cultivars: the list changes faster than one can correct eighty-some pages. Separately, we describe what Spectrum Therapeutics is provided beyond this single entry. It is worth remembering that the pharmacy raw material Rpw and the store category drought are two different things, issued in a completely different manner.

What does Ultra Jack smell and taste like?

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

We provide the profile composition as it stands from the data provider: farnezen, mircen, ocymen, and terpinolen, without percentages. 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 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 percentages and we have proof taken from this very entry. 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 out of one hundred and forty-five entries described there, while the sums themselves vary in this collection from a dozen to one hundred and twenty-five. A number that sometimes stops at one hundred and sometimes exceeds it does not describe the share of the whole, only the method of filling in 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 material is vaporized, and much later if it enters the digestive tract. This is determined by the route the substance takes in the body, which does not change with the name on the packaging. Ultra Jack has no measurements here because no one has published such.

The route of administration determines the course more than the variety itself. After vaporization, the substance passes from the lungs to the blood almost immediately, so the first sensations appear after a few minutes, the intensity increases for another ten to thirty minutes, and the whole effect lasts for two to four hours. After ingestion, the raw material first passes through the intestine and liver, so the first sensations are awaited from half an hour to two hours, and the episode can last six, sometimes eight hours. Hence the most common mistake with oral administration: anyone who thinks nothing is happening after thirty minutes and takes another dose will receive both doses at once. The above ranges describe the route of administration, not this variety; pharmacokinetic studies for a single cultivar have not been published.

For this entry, there would be one more limiting factor. It comes from one manufacturer and one production line, so even if someone measured the course in volunteers, the result would describe a specific series 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 itself from studies: there is no work that has taken Ultra Jack as its subject. However, what is shown for mircen, the compound indicated as leading in the description of this entry, is known, and all three studies we cite here were conducted on mice.

The earliest concerns pain. Rao VS, Menezes AM, Viana GS published it in the Journal of Pharmacy and Pharmacology in 1990 (PMID:1983154). Mircen (10-40 mg/kg) reduced pain responses in mice in hot plate and writhing tests induced by acetic acid; the effect was reversed by naloxone and yohimbine, indicating the involvement of alpha2-adrenergic receptors and the release of endogenous opioids.

The second study, by do Vale TG, Furtado EC, Santos JG, Viana GS, was published in Phytomedicine in 2002 (PMID:12587690). Mircen administered intraperitoneally (100-200 mg/kg) reduced the locomotor activity of mice in an open field test, prolonged sleep induced by pentobarbital (by about 2.6 times at 200 mg/kg), and reduced the number of entries into the open arms of the elevated plus maze, which the authors described as a weak anxiogenic effect rather than anxiolytic.

The latest, by Wagner JK, Gambell E, Gibbons T, Martin TJ, Kaplan JS, was published in NeuroSci in 2024 (PMID:39728677). With short puffs of vapor, mimicking inhalation in humans, beta-mircen acted anxiolytically in the elevated plus maze in female mice, and in males only with a single puff. Unlike linalool, mircen did not produce a synergistic effect with cannabidiol in either sex.

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

The rest of what can be read about this entry is catalog material. The database summarizes the possible effect in one word, calling it stimulating, and such a label has neither a trial involving humans nor measurements 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 series of the material or the dose taken.

What side effects have been reported for this strain?

None, because no one collects them under the strain name. Ultra Jack is a single entry from one manufacturer in Polish circulation, and yet the report goes to the database under the name of the medicinal product and the batch number. The following description therefore concerns dried flower, not that one jar.

Reports of adverse effects are collected for medicinal products with a batch number, not for the strain name, so the following pertains to hemp dried flower as a group of raw materials. The most frequently reported symptoms are dry mouth, red eyes, and increased heart rate. Dizziness upon rapid standing, daytime drowsiness, and temporary worsening of short-term memory are less frequently described, as well as anxiety that increases with dosage. 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 hemp dried flower in Poland do not separate them by individual products.

One caveat applies to this entry more strongly 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 that increases with the dose remains a symptom, regardless of what the label in the strain database promises.

How to vaporize this strain?

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

Three out of four compounds have a boiling point in the database, the fourth one does not have it at all: when querying the compound card, the response ends with an error message instead of a number, and we do not fill an empty field by guessing. The discrepancy is also visible within a single entry, 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: during one pass through the material, some of them will evaporate together.

Why can temperature tables contradict each other, We explain this separately., just as the way the equipment setting differs from what happens in the chamber. The practical conclusion is modest: lower settings leave more volatile compounds in the material, higher ones extract more at once and deplete the batch faster. None of these numbers indicate how much of each will remain in the vapor, as no one has measured that for this strain.

Which strains are related to it?

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

The second parent, Ultra Sour, does not have its own entry in this collection nor any other offspring, so there is nothing to refer to. In the other direction, the record is also silent: none of the eighty-five strains in the cluster indicates Ultra Jack as its parent, which means that there is no offspring of it available in Polish pharmacies today. An empty sibling list is not a gap in the data, but a result: we know the pedigree, 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 entries in the cluster. Jack Herer descends from haze, northern lights #5, and shiva skunk, while Jack Haze was created from the crossing of white widow with haze. Therefore, the common element is haze itself, which is a broad family of style, not an identified cultivar, and sharing such an ancestor does not make two names siblings. From Jack Herer Ultra Jack is connected solely by the term in the name, which means nothing when selecting raw material for a prescription.

Frequently asked questions about the Ultra Jack strain

Is Ultra Jack a sativa strain?

Yes, one strain database has classified it as such, but this term is from the seed trade, describing the plant's growth habit. It says nothing about the composition of a specific batch of dried flower and does not replace the results of batch testing.

How many producers supply Ultra Jack to Polish pharmacies?

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

Why don't you provide the THC content of this strain?

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

Which terpenes does the source list for this strain?

Farnesene, myrcene, ocimene, and terpinolene, without a breakdown of 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 would focus on this cultivar. Available studies concern individual terpenes, primarily myrcene, and were conducted on animals, so we cannot draw conclusions about the strain from them.

Dried flower is a pharmaceutical raw material dispensed by prescription from a doctor 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 redakcja ubucha.pl.