Spliff Seeds
Jack F1

Jack F1

breed by Spliff Seeds

Here you can find all info about Jack F1 from Spliff Seeds. If you are searching for information about Jack F1 from Spliff Seeds, check out our Basic Infos, Gallery, Degustation, Awards, Strain Reviews, Lineage / Genealogy, User Comments or Videos for this cannabis variety here at this page and follow the links to get even more information - or list all Jack Strains (215) to find a different version. If you have any personal experiences with growing or consuming this cannabis variety, please use the upload links to add them to the database!

Basic / Breeders Info

Jack F1 is a mostly sativa variety from and can be cultivated indoors (where the plants will need a flowering time of ±67 days) and outdoors. Spliff Seeds' Jack F1 is a THC dominant variety and is/was also available as feminized seeds.

Spliff Seeds' Jack F1 Description

Spliff Seeds Jack F1 Jack F1 is a Dutch crossbreed between Northern Lights, a Skunk F1 and a Mexican Haze. She is the result of a long and arduous selection process to obtain suitable phenos as parents. We took several generations of thorough back-crossing to her original parents to stabilize the strain, allowing further generations to pretty much give identical offspring. This resulted in our Jack F1. She is a 75% Sativa plant with extremely high THC level. Jack F1 has an Indica appearance, but is definitely a Sativa. However, with a short flowering period. Jack F1 is covered in snowy crystals of resin from top to bottom. Stick to advised nutrients, don’t overfeed. Especially during the vegetative period (4 weeks) keep nutrient levels at a minimum. Keep her on a 24/7 schedule during vegging, to limit height. This advise basically goes for any Sativa. Preferably grown in soil or coco with plenty of space. A Sativa dominant plant she will form one giant main cola, so don’t prune her.

Smell is sweet, spicy and slightly cinnamon. The taste is sweet and spicy with a touch of haze. A longlasting cerebral high and body buzz. Classic Sativa high. Highly medicinal strain. Medicinal value: Add, adhd, anxiety, arthritis, cramps, depression, inflammation, insomnia, loss of appetite,migraine, pms/pmdd, pain: muscle/joint and neuropathic pain.

75% Sativa.
Genotype: Skunk #1 x NL x Mexican Haze.
Cinnamon aroma and sweet and spicy flavor.
Huge resin production. Massive budding beast. Soil or coco is ideal medium.
Medicinal strain. Longlasting, cerebral high with a nice body buzz.
Potential THC level: high.

Flowering time indoor: 9-10 weeks
Harvesting outdoor: October
Plant height: Indoor 1.50-1.80m / Outdoor 2.00-3.00m
Yield: Indoor 350-450 gr/m² / Outdoor: 400 gr/plant
Growing difficulty: medium

Jack F1 Awards

Spliff Seeds' Jack F1 is a cupwinning variety and won the 2nd Place at the Highlife Cup 2010 in the category Bio, submitted by Growside!

Jack F1 Reviews

We've collected strain info from 3 growers for Jack F1, check out the reviews about the indoor and outdoor grow here.

General Impression

Strength / Lasting Effect
The weed is strong and long lasting
User Rating
Jack F1 gets 6.88 of 10 possible Points in the average!

Known Phenotypes:

  1. long, compact, slowly blossoming, indica-dominant Phenotype #1
  2. long, stretched, slowly blossoming, sativa-dominant Phenotype #2

More Info:

Please click here to see the full Plant-Profile!

How is Jack F1 growing outdoors?

Harvest Time Outdoor
End of October
in BxlSaβ climates
Yield / Quantity Outdoor
The crop of this strain is very high
General Impression Outdoor
Jack F1 is all together extraordinary and quite recommendable

...learn more

How is Jack F1 growing indoors?

Flowering Time Indoor
70 - 70 days (±70 days)
Yield / Quantity Indoor
The crop of this strain is ordinary
General Impression Indoor
Jack F1 is all together slightly above average

...learn more

Jack F1 Degustation

The seedfinder users tested Jack F1 and uploaded information about the aroma, taste and effects of Spliff Seeds' Jack F1. Here a short overview, click to the charts or links to get an exact description and find similar cannabis varieties!

Aroma / Smell

~0% Strawberry ~3% Orange Blossom ~0% Berry ~6% Lemon ~7% Blood Orange ~7% Tangerine ~5% Thyme ~5% Cloves ~5% Fennel ~2% Coughsyrup ~2% Medicine ~3% Tar ~4% Floral ~2% Fruity ~7% Honey ~7% Butterscotch ~6% Citrus ~14% Orange ~15% Herbs ~6% Chemical ~15% Earth ~6% Wood ~9% Leather ~20% Sweet ~20% Sour ~20% Spicy ~10% Bitter ~30% Microbiological

The aroma / smell of Jack F1 can be described best as fairly Microbiological (Earth; a bit of Leather and also a little bit Wood) and additionally as a little bit Sweet (a bit of Honey and Butterscotch and also a little bit Floral and Fruity), Sour (partially Orange and also a bit of Citrus), Spicy (Herbs) and Bitter (a bit of Chemical). more

Taste / Flavour

~1% Strawberry ~2% Orange Blossom ~1% Berry ~3% Lemon ~3% Tangerine ~3% Thyme ~4% Cloves ~1% Coughsyrup ~1% Medicine ~2% Tar ~3% Floral ~3% Fruity ~3% Honey ~3% Butterscotch ~3% Citrus ~3% Orange ~7% Herbs ~5% Sandalwood ~5% Cedarwood ~13% Pine ~3% Chemical ~13% Earth ~13% Sweet ~10% Sour ~36% Spicy ~5% Bitter ~37% Microbiological

The taste / flavour of Jack F1 was characterized as fairly Microbiological (a little bit Earth) and Spicy (a bit of Pine and also a little bit Herbs, Sandalwood and Cedarwood), a little bit Sweet (a little bit Floral, Fruity and Honey) and Sour (a little bit Citrus and Orange) and additionally as minimal Bitter (a bit of Chemical). more

Effect / Effectiveness

~11% Activating ~30% Uplifting ~23% Exhilarating ~11% Thought provoking ~4% Calming ~12% Energetic ~5% Appetizing ~4% Pain numbing ~75% Head ~25% Body

Jack F1 have basically a prominent effect to the Head (fairly Uplifting and Exhilarating and also a little bit Activating and Thought provoking) but is also affecting (a little bit less) to the Body (Energetic and also a little bit Appetizing and Pain numbing). more

Here you see the latest Jack F1 photos, uploaded from our users! Altogether we've collected 8 pictures from Spliff Seeds' Jack F1, check out our Jack F1 gallery to view them all.

Jack F1 Lineage / Genealogy

Jack F1 User Comments

Altogether we've collected 2 user comments about Spliff Seeds' Jack F1. Here you find the 2 english user comments:

- 05.01.2020

This comment is connected to a Jack F1 review!

Note on Jack F-1 Phenotypes, Bud compactness, and Effect:

I popped two Jack F-1 seeds and got two phenotypes. Both reached 8 feet tall, but the leaves on the one were fatter and shorter, and slender on the other. The sativa-looking plant was more vigorous and christmas-tree shaped with side branches creating a wider girth. The indica-looking plant had side-branches that were fewer in number, and her leaf morphology reminds one more of Spliff's White Widow (a "mostly indica" strain) than a sativa. See my photos comparing these two Jack F-1 phenos alongside Spliff's WW after about one month of veg, in early May.

I was puzzled at first because Spliff's states -- see Basic Info page above -- that "Jack F1 has an Indica appearance, but is definitely a Sativa." For me, that was confusing because the more vigorous plant, the one which got absolutely huge and produced the larger quantity of bud, was clearly a sativa-pheno that Spliff's did not mention. So at first I was not sure which phenotype was the pheno Spliff's had selected and back-crossed for. Now it is clear to me that Spliff's selected for what I am calling the indica-looker, designated as pheno #1 here on seedfinder.

"Jack F-1" growers will note that these phenos exist. By definition, an F-1 hybrid is a cross of two IBLs and is 50% stable. It can show variation from one individual to the next. Jock Horror is IBL, but numerous posts by Spliff's say the breeder used a Skunk F1 to produce "Jack F-1", so not all plants will have the indica look. By back-crossing with Jock Horror, the chances of getting the indica-looking pheno may have been locked in to a good degree, maybe 75% or 87.5%, depending on the number of BX.

My sativa-looker (pheno #2 here on seedfinder) produced an abundance of slightly fluffy buds (I've got 9 quart jars curing). Her buds have some compactness -- there is a "hard" interior if squeezed -- but are slightly fluffy on the outside. A large amount of rough leaf material was also prominent on pheno #2, making manicuring messier. The indica-looker (pheno #1) actually has very tight and compact -- "hard" -- buds, which were much easier to harvest, manicure, and cure. See photo of finished bud.

There is no difference in effect as between the two phenos. Jack F-1's effect compares very well with that of the original Jack Herer, being a nicely balanced blend of stimulating and clear haze head high with a subtle and pleasant indica body buzz. When I grow Jack F-1 again, I will try to select for the indica-looking pheno in hopes of getting these highly compact buds. Compactness makes harvesting, curing, and smoking easier. this comment

- 14.01.2014

This comment is connected to a Jack F1 review!

Jack F1 from Spliff Seeds was easy to grow. One main cola, very meaty. Hard buds when dried. Tasty pot with a good, mellow high, and yet you can do chores like housework quite happily---easy to play in your imagination whilst working. Short term memory takes a vacation. Can be watching telly and by the time the 1st commercial is through you have forgotten what show you’ve been watching! Good times, mate. Good times! this comment

Jack F1 Videos

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