Jack Herer Auto Cannabis Strain Week-by-Week Guide

Our week-by-week guide for this renowned strain, in honor of the cannabis activist!
23 November 2020
13 min read
Jack Herer Auto Cannabis Strain Week-by-Week Guide

  • 1. History
  • 2. Specifications
  • 3. Week-by-week guide
  • 3. a. Week 1 - germination
  • 3. b. Week 2 - vegetative stage
  • 3. c. Week 3 - vegetative stage
  • 3. d. Week 4 - vegetative stage
  • 3. e. Week 5 - pre-flowering stage
  • 3. f. Week 6 - flowering stage
  • 3. g. Week 7 - flowering stage
  • 3. h. Week 8 - flowering stage
  • 3. i. Week 9 - harvesting
  • 4. What to expect?
  • 5. In conclusion

1. History

Jack Herer was one of the most active cannabis activist, he became famous all over the world for his deeds in the cannabis world.

Back in the ‘90s, there was a rumor a Dutch seed bank was working on a new genetics. The strain was kept hidden until 1990 when it was released in honor of Jack Herer, having the same name as the activist.

Until today nobody knows the exact crosses of this strain is, but it’s speculated that this hybrid comes from a cross between Skunk #1, Northern Lights #5, and Haze.

Although people weren't expecting it, Jack Herer became an instant classic. 


Jack Herer Auto: history

Beautiful Jack Herer buds almost fully mature.

This strain became to be available in Dutch pharmacies in the 1990s and started winning awards worldwide, not only for its medicinal properties but especially for its unique aroma

Jack Herer is the only genetics that has won more than 10 Cannabis Cups, it was found everywhere back at the time and is available in most coffeeshops in Amsterdam and it’s widely found in California.

Without a doubt, this is the most legendary strain since the ‘90s deserving a place in the cannabis Hall of Fame.


2. Specifications

At Fast Buds, we developed this multiple award-winner to automatic perfection. Our Original Auto Jack Herer is a medium-sized strain that will grow around 90cm despite her Sativa heritage. 

Even though it doesn’t grow as tall as other Sativas it can yield exceptionally. This lady will be completely mature in 9 weeks and will grow multiple side branches that will fill out from top to bottom producing up to 500gr/m2 of buds.

Her flowers are long and fat with a huge amount of pistils all throughout the bud, which is also flooded in trichomes. It literally looks like resin is oozing from all around the buds, a truly impressive strain.

Jack Herer Auto
Jack Herer Auto
Sativa 65%/Indica 35%
Jack Herer Autoflowering
9 weeks
400 – 500 gr/m2
70 – 110 cm
Up to 21%
< 1%
Buy seeds from 9,00 €
1 fem
9,00 €
2 fem
16,00 €
3 fem
24,00 €
5 fem
40,00 €
10 fem
70,00 €
25 fem
150,00 €
50 fem
250,00 €
100 fem
420,00 €
500 fem
1 450,00 €
1000 fem
2 400,00 €
3 fem
Add to Cart
24,00 €

Original Auto Jack Herer has a very savory-sweet flavor that expresses the full spectrum of floral and fruit terpenes. A mix of sweet, peppery, fruity, and spicy that enhance the very pleasant high.

The effects of this hybrid are very enjoyable and allow you to quickly relax while staying focused, she is a fine balance of Indica and Sativa, perfect for smokers with a low tolerance or new smokers.

A perfect strain for smoking in the morning to get through the day with a clear head and stress-free also great for gaming and listening to music or movies.

3. Week-by-week guide

This article serves as a guideline so growers know what to expect when growing this classic in auto version, here you can see the conditions kept throughout this grow report and the results obtained by several growers.


Grow Specifications
Light Fixture: LED/HID
Light Cycle: 18/6
Humidity: 45-70%
Temperature: 19-29°C
Grow Space: Indoor
Nutrients: Synthetic
PH level: 6.0-6.5
Seed to Harvest: 9 weeks


Have in mind that this written timeline was made to help you, even though you’ll be able to grow your plants in most conditions, you should adjust your growing setup depending on the conditions and the specific strain.


Week 1 - Germination

As usual, week 1 is where this journal starts, the growers started by germinating the seeds directly into the medium, we usually recommend soaking them in water for up to 48hs and them placing them in a paper towel,  but you can germinate them any way you want as long as you’ve done it before and know your method will work.


Height: 3cm
pH: 6.2
Humidity: 67%
Temperature: 24°C
Watering: 150ml


As you can see, the baby plant came out of the soil without a problem and is boasting a rich-green color, remember that keeping proper conditions is the best way to ensure your plant comes out without a problem, independent of the type of medium.

So these ladies were a new addition to the fast buds room after 4 days of germination time. Even their beans are popping fast!...over 100% germination rate in 4 days with the bio root! -416fireman

As you may know, if you’ve grown any kind of plant before, you can have your whole grow cycle in any type of medium and grow setup as long as you maintain proper conditions.

In this stage, you should check and adjust the relative humidity to be around 70% and the temperature between 18-25°C for your seedling to grow properly.


Jack Herer Auto: week 1

Week 1 from seed by 416fireman1, Ga4rd2en0er2 and AngryBird3.

Remember that if it’s hard to control the humidity at this stage, you can use a store-bought (or make one with a plastic bottle) dome to help maintain a high temperature, now, have in mind that this may help you but you will need to control the conditions throughout the whole grow cycle and it can get hard to control it by improvising.

Week 2  - Vegetative stage

If you’ve done everything correctly, your plant will slowly start to develop more and more leaves, the first one having one apex and the following developing more until it reaches the maximum the specific strain can develop, this is just a characteristic and won’t affect anything other than how your plant looks.


Height: 8cm
pH: 6.4
Humidity: 60%
Temperature: 23°C
Watering: 200ml


As soon as you see the third pair of true leaves, you can start plant training (if you wish to), just have in mind that because this plant is ready to be trained in the second week, it doesn’t mean all will too.

Also, when you see the first three-fingered leaves, you can start feeding a lower dose of Grow nutrients in a 3-1-2 ratio, even though plants need Nitrogen to develop the leaves and branches, they’re still quite fragile so make sure you mix a light nutrient solution.


Jack Herer Auto: week 2

Week 2 from seed by 603Shaman1, Getupandgrow2, Korndiaries3.

Depending on the medium and nutrients, it’s essential you measure the pH and PPM because depending on the pH level, your plant will not be able to absorb certain nutrients that are essential for plant growth, now, this is not obligatory and you will be able to grow cannabis without doing it but doing it will take your harvest to the next level, so it’s highly recommended.

Week 3  - Vegetative stage

In week 3 the roots should have established and when this happens, you’ll see an explosion in growth; In this case, our Jack Herer Auto really grows during the flowering stretch but you will see your plant grow a lot once it enters the pre-flowering stage.


Height: 18cm
pH: 6.5
Humidity: 65%
Temperature: 24°C
Watering: 300ml


In the first days of the fourth week, you should see your plants really growing a lot, if you’re planning to perform some plant training, now is the time to do it; By now your plants should have developed 2-4 pairs of leaves and developed a good internodal space for you to tie down the branches, for example.

It’s recommended you start with either LST or HST once you have at least 3 pairs of leaves, you can start whenever you want but letting your plant develop a bit is better than to start training as soon as your plant comes out.


Jack Herer Auto: week 3

Week 3 from seed by ElChicoDelaWeed1, AngryBird2, supermegadjj3.

Remember that we don’t usually recommend HST on autos, you can have the same results by performing LST techniques such as SCRoG, SoG, or tying down the branches but depending on your experience you can get great results by using HST methods such as toping or fimming.

Also, HST means High-Stress Training so naturally, your plants can get more stressed when doing it so we recommend doing it carefully and gradually, always checking and adjusting the conditions so your plants can recover and continue growing as fast as possible.


Week 4  - Vegetative stage

If everything goes as it should, this week marks the week before the pre-flowering stage and you should see the flowering sites slowly turning light green, there’s no need to worry if the flowering sites are the only things turning light green but if you see the leaves also changing color, it may be a sign of nutrient deficiencies.


Height: 35cm
pH: 6.5
Humidity: 55%
Temperature: 27°C
Watering: 600ml


By now you should already be feeding a full dose of Grow nutrients and if you’re growing regular seeds, keep an eye out for male plants which usually mature 1-2 weeks before female plants.


Jack Herer Auto: week 4

Week 4 from seed by Jd1971 .

In this case, the cultivators are growing feminized autoflowers so there’s no need to worry about that, just remember that if male plants can end up pollinating the buds produced by female plants so it’s essential you keep check your grow space every day.

Week 5  - Pre-flowering stage

Week 5 marks the beginning of the pre-flowering stage and as you can see in the photos below, your plants will start to show signs of female flowers such as trichomes and stigmas, even though the smell won’t be as apparent now, they will start smelling quite strong so watch out.

When you see the first signs of flowers, you should start gradually lowering the amount of Grow nutrients and slowly start feeding Bloom nutrients which help your plant in the production of buds, trichomes, and stigmas.


Height: 60cm
pH: 6.5
Humidity: 55%
Temperature: 27°C
Watering: 1000ml


To help your plant get ready for when she’s in full-flowering mode, you should provide Phosphorus and Potassium which are the macronutrients plants need when flowering, also, depending on the type of medium you’re using, you should provide Calcium and Magnesium among others because sterile mediums don’t provide these micronutrients.


Jack Herer Auto: week 5

Week 5 from seed by TheFunks, ElChicoDelaWeed .

Have in mind that cannabis thrives in certain conditions and it’s essential you adjust them to the stage your plants is in, during the pre-flowering stage, you should maintain the relative humidity around 55-60% and the temperature between 18-25°C.

Also, if you were performing any kind of plant training, you should stop now because stressing your plants now can have a very negative effect on the quantity and quality of the harvest, obviously, if you are growing in a SCRoG net you don’t have to remove it but if you were tying the branches or topping, you should not continue doing it.

Week 6  - Flowering stage

This week marks the first half of the flowering stage and by now your plants should be in full-flowering mode, throughout this week and the last one you should have seen your plants growing exponentially and that mouth-watering cannabis smell coming through.

Depending on where you’re growing, the weed smell can be quite overwhelming so make sure you have a carbon filter installed and ready to go or, if you’re growing outdoors, it’s a good idea to have several aromatic plants such as peppermint and lavender to help mask the strong smell.


Height: 70cm
pH: 6.4
Humidity: 50%
Temperature: 29°C
Watering: 1500ml


After the buds have started developing they will start smelling quite strong and that sweet smell can attract bugs which can end up killing your plant so remember to check your plants every day for signs of bugs or mold.

Also, most beginner growers end up losing their harvests due to powdery mildew or bud rot so make sure you keep the humidity controlled and always check for white spots or brown spots on the buds which are signs that mold has reached your plants.


Jack Herer Auto: week 6

Jack Herer Auto on week 6 by Korndiaries .

If you’ve had problems with bugs before or if you just want to prevent them, a good way is to place several yellow sticky traps that will not only catch them but also let you know if bugs are getting into your grow tent, you can also spray a light mix of organic pesticide all over the inside and outside of your grow tent, just make sure you don’t spray your plants because it may end up affecting their smell and flavor.


Week 7  - Flowering stage

Week 7 from germination marks the beginning of the second half of the flowering stage, these last weeks is when you will truly see your plant fattening up the buds so by now you should already be feeding a full dose of nutrients but without overfeeding because it can end up having the opposite effect and end up lowering the yields.


Height: 80cm
pH: 6.4
Humidity: 50%
Temperature: 29°C
Watering: 1700ml


Have in mind that even though this strain usually grows up to 110cm, it may end up higher or lower, depending on the conditions provided and the training method performed, if you think your plants are growing less than they should, you should check everything, humidity, temperature, the amount of nutrients and your light fixture to make sure your plants are getting what they need.


Jack Herer Auto: week 7

Beautiful Jack Herer by ElChicoDelaWeed.

As you can see in the photo above, you can see that from afar the buds look like they’re fully formed but when looking closer, the buds still need to fatten up a bit more and more trichomes are yet to develop so keep up the good job and be patient, you only need to wait two more weeks.

Week 8  - Flowering stage

Week 8 from seed marks the week before harvesting, by now the smell should be super pungent and some of the stigmas should start to brown and wilt, now, remember that stigmas are a way to know if your plants are ready for harvest but you should wait until the trichomes are completely mature and around 60-70% of the trichomes are cloudy.


Height: 85cm
pH: 6.5
Humidity: 45%
Temperature: 27°C
Watering: 1800ml


To see the trichomes clearly, you will need a tool to be able to zoom in and know exactly when to harvest, usually, growers use a jeweler’s loupe but you can also use a microscope or anything that will let you see them clearly.

Romping through flowering!! Still mega bushy!!!...Looking good so far! -Dunk_Junk

Also, depending on the type of nutrients you should start flushing to remove the salt build-up in the roots and soil, this will help you enhance the aroma and flavor, and will result in an overall better tasting harvest.


Jack Herer Auto: week 8

Jack Herer Auto one week from harvest by Dunk_Junk.

Have in mind that depending on the medium, you should also check the PPM and pH of the water you’re using to flush your plants because water can contain trace elements and may end up providing more minerals instead of washing the minerals off the roots and medium.

Week 9  - Harvesting

Week 9 marks the last week of this grow cycle and is the week when you’ll be harvesting your Jack Herer Auto, if you’ve started flushing, you’ll see the fan leaves starting to yellow which is a sign that you’re doing it properly. Now, this could be a problem in any other stage of a cannabis plant’s growth cycle but if it’s during flushing, everything should be fine.


Height: 90cm
pH: 6.5
Humidity: 45%
Temperature: 27°C
Watering: 1800ml

Have in mind that before being able to consume your flowers, you’ll still have to dry and cure them so before chopping down your plants, make sure you have your drying room ready so you can hang them upside down as soon as you cut the branches and trim the bigger leaves.


Jack Herer Auto: week 9

Buds fully formed by 416fireman.

Also, keep in mind that the strong cannabis smell will perdure even during the drying stage so you should have a way to eliminate or mask the smell; You can use odor neutralizers or a carbon filter with an exhaust fan dimmed down to avoid having problems with your neighbors.


4. What to expect?

Now that your plants are hanged down and already drying, you have to wait around 2 weeks before you can start the curing process which lasts a minimum of 2 weeks so if you’re eager to know what to expect, here’s what our growers have reported.

You can expect a unique blend of earthy and sweet aromas with a spicy and peppery citrus edge that offers the full spectrum of floral and fruit terpenes and consists of the following main terpenes:

  • Terpinolene
  • Caryophyllene
  • Humulene
  • Limonene

The primary terpenes in combination with the secondary terpenes that you will see in the chart below provide a very pleasant high that allows you to relax while keeping alert and focused.


Jack Herer Auto: terpene profile


This terpene profile provides an extremely floral and fruity flavor that results in a 65% Sativa and 35% Indica effect that offers the best of both worlds and will keep you energized and uplifted while also allowing you to go through your day relaxed and stress-free.


Jack Herer Auto: harvest

Buds after harvest by AngryBird.

Growers haven’t reported any negative effects but some people have reported that the effect can be overwhelming. So you’re not used to this type of effect we recommend being extra careful if it’s your first time smoking cannabis.

5. In conclusion

If you’re looking to grow some old-school classics, this strain is a must-try! This Sativa-dominant hybrid delivers a really pleasant effect that won’t leave you couch-locked and will allow you to do your chores without thinking twice.

If you have grown this strain before and want to give fellow growers a couple of tips to improve their growing experience with this strain, please leave a comment in the comment section below!



External references

  1. Stomata and Trichome Development. - V, Vadivel. (2020). 
  2. Terpene Synthases and Terpene Variation in Cannabis sativa. Plant Physiology. - Booth, Judith & Yuen, Mack & Jancsik, Sharon & Madilao, Lina & Page, Jonathan & Bohlmann, Joerg. (2020).
23 November 2020