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7 - 9 Weeks
Indoor / Outdoor
Sage & Citrus
Flowers, Citrus, & Pepper
Energetic & Creative
19% - 21%
0.76% - 0.96%
0.33% - 0.9%
0.23% - 1.44%
0.18% - 0.32%
0.16% - 0.7%
Terpinolene, Phellandrene, Caryophyllene, Carene, & Limonene
Review & Effects
Jack Strain, also known as "Jack Herer," "Platinum Jack," and "JH," was bred by Sensi Seeds back in the mid-1990s and named for the legendary cannabis activist Jack Herer. This strain has been a parent to countless hybrid crosses.
Requirements for Growth
The Jack Strain has a more energetic, uplifting, and cerebral high than most other marijuana strains. Like other sativa dominant strains, the Jack Strain tends to get very tall and may not be well-suited for indoor gardens.
Fortunately, the Jack Strain is also a very generous yielder.
The Jack Strain grows well in bright, sunny weather; so, if you do plan to grow the Jack Strain indoors, make sure to keep your lights about 18-24 inches from the top of your canopy and raise them up slowly as the plants grow.
Keeping your lights close to the top of your canopy will also help control stretching, which the Jack Strain is known for doing. Just make sure that the colas never touch the lights.
When growing the Jack Strain, it’s a good idea to prune your branches early to keep a nice even canopy and prevent your plants from growing too tall.
Do to its longer flowering time, the Jack Strain doesn’t need to spend a lot of time vegging. In fact, indoor growers can probably get away with a 72-hour veg. The Jack Strain also does better in larger containers, due to its larger overall size at harvest. However, we still recommend starting the Jack Strain in small containers and transplanting them into larger containers after about a month.
This extra step will help strengthen the roots and ultimately increase the overall yield at harvest.
Indoor growers should always maintain a temperature of around 74 – 78 degrees Fahrenheit inside their grow space and keep the air circulating. The Jack Strain can handle humidity well, but we still recommend that you take steps to ensure your plants are receiving adequate ventilation.
Since the Jack Strain tends to grow tall and thin, you should seriously consider adding some type of support system to your crop, such as a trellis net or tomato cages, to prevent mature flowers from weighing down the thinner branches.
The Jack Strain also tends to be a thirstier strain than most and therefore requires more frequent watering so be sure to keep an eye on the dampness of your substrate.
You can increase your yield, and the overall health of your plant, by allowing the substrate to almost dry out in between waterings. This measure will help encourage root growth and lead to a more vigorous outcome.
Due to its unmistakable smell, we recommend taking all possible security precautions when growing the Jack Strain.
Always make sure to calibrate your pH meter properly, and always adjust the pH of your water so that the run-off water measures around 6.0.
Make sure to also allow adequate time for flushing to remove any residual mineral salts that may have accumulated during flowering.
We recommend that soil growers flush the Jack Strain for 10 to 14 days prior to harvest and that hydroponic growers flush the Jack Strain for 7 to 10 days prior to harvest.
In general, longer flushes tend to produce better flavors and aromas without decreasing yield.
Lastly, be patient. The Jack Strain flowers quickly, but you should still monitor the trichomes closely under a 100x microscope and give them time to mature and start to turn amber before harvesting.
If you decide that you would like to try growing the Jack Strain for yourself, just click the buttons below to buy seeds or clones.
How to Start Seeds of
You can start your seeds in damp paper towels, coffee filters, napkins, or seed starter plugs. Simply dampen the medium with distilled water, place the seeds on the medium, and store in a warm, dark place for 3-5 days.
Once your seeds have sprouted, be sure to transfer them into soil or some other type of substrate as soon as possible.
The Best Soil for Growing
Tupur Mix is a coco fiber-based soilless medium that contains a heavy amount of perlite; and nothing else.
In other words: It's the PERFECT growing medium for seeds, clones, and young plants.
Keep in mind that while mature plants LOVE stuff like seabird guano and earthworm castings, whereas younger plants prefer clean, well-draining soil; and a light nutrient regimen that gets progressively stronger as the plant grows.
That's why we love Tupur Mix - it allows for MAXIMUM control over your feeding regimen!
This substrate is designed to let you feed your plants as often as possible without overwatering or burning your plants.
These unique factors make Tupur Mix ideal for young plants in containers, automated watering systems, drip-to-drain, ebb-and-flow, deep water culture, and aquaponic gardens.
Tupur Mix strikes the perfect balance between drainage and moisture retention while still allowing for adequate aeration to prevent water logging.
How to Plant Clones of
When repotting a plant, the substrate should always come out of the smaller container in one piece.
Another key to transplanting clones is to make sure that the substrate in the new container is saturated with water to allow you to pack the soil down around the plant once it's been transplanted.
Best Nutrients for Growing
Stop wasting money on overpriced nutrients and start getting the results you want with this COMPLETE nutrient regimen! The Humboldt Secrets Starter Kit will allow you to grow the PERFECT crop every time!
The Humboldt Secrets starter kit has everything you need to get your plants through to harvest and enough concentrate to make between 125 - 150 gallons of solution!
This premium line of nutrients is compatible with all growing mediums and works equally well indoors, outdoors, and in greenhouses!
The Humboldt Secrets line is one of only a few cannabis-specific nutrient products and is made with premium ingredients for maximum nutrient uptake.
That's why we recommend it!
Best Light for Growing
The best indoor grow light on the market today is the Gavita Pro 1700e LED 120-277 Volt. This versitile, full-spectrum LED light delivers the perfect balance between output and efficency!
The Gavita Pro 1700e offers full lighting control and plug-and-play adaptability. Plus, this unique LED array is designed to omit the perfect wavelength of light for maximum growth and optimum plant health.
There simply is no substitute.
For additional control over your light cycle; including automatic sunrise and sunset, auto-dim/auto-shutdown, and temperature calibration; we recommend also purchasing the Gavita Master Controller EL2.
Nutrient Deficiencies in
For help diagnosing and correcting nutrient deficiencies, refer to the chart below. For more information about diagnosing nutrient deficiencies in cannabis, be sure to read: "What's Wrong With My Plant? - Diagnosing Nutrient Deficiencies in Cannabis."
When to Top Your
We recommend topping your plants when they're about 24 inches tall and before they begin flowering.
Growers who choose to employ low-stress training techniques (SCROG or SOG) may end up topping multiple times.
Topping a plant temporarily deprives it of growth horomones called auxins that are present in the tips of the shoots and regulate vertical growth. In the absence of these hormones, the plant begins to grow horizontally for a few days until the auxins recover.
This "horizontal growth" leads to the development of multiple meristems that can each eventually support a large flower.
That's why topping is a widely accepted practice that has been shown to dramatically improve yields.
Possible Side Effects of
Marijuana consumption may trigger adverse effects in some people. Less experienced consumers are more likely to experience side effects, including but not limited to:
Dry or Red Eyes
Increased Heart Rate
In general, these effects dissipate after a few minutes as your body metabolizes the THC.
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