Topping Autoflower Plants

Purchased a beginner kit of White Widow autoflower. I’m in week 2, and the plants are doing well. 100% seedlings from the seeds. Im impressed. I

to keep the plants rather short. Is it advisable to top, fim, supercrop, etc. autofliwer plants? Should I just expect them to flower after a set number of days? I just do not want to top or something if they are going to flower immediately after and ruin the top bud growth. Any advice appreciated on WW autoflowering plants.

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I hope this helps, you can top an auto flower, but it has to be done at a certain time or the plant won’t have enough time to recover and hurt the yeild. Lst could be a better option for training it for a better yeild. Majiktoker, sent this to me I hope this helps in some way

As we all know, cannabis is a photo-period plant: ie it’s flowering hormones are triggered by changes in the light/dark cycle. Thus you can stimulate a 2 week old cutting to begin flowering by giving it 12 hours of darkness, yet a 4 month old plant grown outside will remain in vegetative growth until mid-summer has passed.

Autoflowers are a different breed altogether (quite literally!) and will flower according to the age of the plant rather than the light/dark cycle. This development has been obtained by crossing a ruderelis strain with a standard photo period plant. Unfortunately ruderelis is fairly weak in the desired thc levels so the first autoflower strain developers had to stabilise two dominant traits: the high thc level provided by the photo-period parent and the all important auto gene from the ruderelis strain. As you can expect, early attempts were generally disappointing, and as little as four years ago autos were viewed as unreliable with poor yields and low thc levels. Most sensible growers put them down as gimmicks for newbies.

Today if you see an autoflower seed for sale you can be (reasonably) assured that its THC content will be as advertised, and its auto gene stabilised.

Now this is the big question. Most breeders claim 7-9 weeks, with some even boasting seed to harvest in less. It would be fantastic if one could get 50g per plant after just 39 days, but lets face it, its totally unrealistic. A plant doesn’t grow any faster for having an auto gene, and the dwarf autos that will harvest in ultra quick times are just that: dwarfs and thus yield is limited by size.

Of the 15 or so different commercial strains I have tried, not one of any consequence finished in less than eleven weeks – and the best ones can take anything between 3 and 5 months. If you think about it, this is not surprising: most standard autos start showing their sex at around 21 -28 days (super autos not included) – if you add on a flowering time of 8 weeks (average flowering time for a indica) then you would be looking at 11 – 12 weeks.

I think this section is the do or die between having a great auto crop or a disaster. Autoflowers have such a short vegetative growth period and the final plant is rarely very big. Get it wrong and you’ll end up with a lollipop stick of bud. That’s why I think that whilst autos fulfil a gap in the outdoor growers repertoire (after all its damnedably difficult to control the light/dark cycle of the sun), if you can its best to start them off indoors under lights. You just maximise the level of control that way.

“Once you pop ’em you can’t stop ’em”

Effectively this means that whilst the answer is “yes”, the autos have a genetically limited life: from the moment the cannabis seed germinates it will progress through its short vegetative stage and speed onto flowering. As the “mother” plant won’t be big enough to take a clone until she is around 5 weeks old, once you have added a week whilst the clone roots, the clone thinks of itself as 6 weeks old and upward vegetative growth will have finished. Despite being tiny, the cutting will finish flowering at the same time as the mother more or less – here’s one I tried for a laugh:

guide to autoflowers

Start off with a little veg feed at around week 2 and slowly increase the amount of feed as the plant develops up to (depending on the auto) around week 6 or even 7. Wait to switch to flower food until after the cannabis plant has noticeably stopped its upward growth, even though she may have been flowering for a week or so beforehand.

You can grow autos on 24/0 but I think its good to let them have a little rest time and electric consumption is also a issue. I grow mine for the first two weeks under a 120 watt draw Fero LED for the first couple of weeks and I tend to keep that on for 21/3 with the LED grow light around 70 -80 cm away from the seedlings. When then they are potted on to the 13 cm sexing pots and put under my larger LEDs I then change the lighting schedule to 18/6 where it will remain until I crop.

Yes you can but it needs to be in the very early stages as it holds the plant back in that critical time. I’ve experimented over several crops with this and my advice would be that you are better off not pruning autoflowering marijuana as in most cases the plant will end up giving less weight. That said, you can break the apical dominance and encourage vigorous side branching by “knuckling” if you are using a longer term variety such as the “Cream Caramel” (yes Sweet Seeds, I know you say this is an 8-weeker, but every one I’ve grown has gone to 12 weeks plus).

Lets assume your environmentals are all good, with light at around 400watts a m2, temps at around 23ºc, humidity 55% for flowering and you are replenishing your air every couple of minutes whilst maintaining a good nutrient regime and getting plenty of O2 to the roots etc etc (who ever said growing great smoke was easy?)

The simple answer is : it depends on how long the plants are going to take. The 3-monthly varieties such as MI5 (Shortstuff) average around 40g a plant (dried weight) under my fero led lights at 10 per m2 and the longer super varieties such as Chase (15 weeks) 150g -500g a plant outdoors


Check out my grow journal. “New grow is going to be learning experience” im growing white widow autos. I have LST all but 1 ive topped and ive FIM’med. They are doing great. The key i believe is doing it very early. The one that was topped with LST has 12 branches trying to be dominate. Most even with no cutting or pinching, just LST have 6-8 topps. Now that flower has started i did one last bend just to open centers up again the day i changed to the HPS bulb and the LED to flower, and wont touch em anymore. Ill try to update picts. Tonight but the one single wwa i didnt touch is the smallest of them all. With one main cola and 2 little branches.


I know this is an old post. But I cbd done 3 auto grows from ILGM on my 4th now
I see people on internet saying 80 days.
I’ve never had one from ILGM under 12 weeks not saying that’s a bad thing because I get good yields. I’m guessing it’s their Ruderalis genes compared to other seed banks. But I topped a Amnesia Haze and Blueberry Autoflower last grow and with the 13 weeks it took I probably came close to doubling my yield. And their autos finish beautiful colors and seem to have a smell citrus or fruity. My first was 4 WW auto no training beginner luck. I have a Northern light finishing up noe and it did not smell until week 11 and barely. No carbon scrubber with northern lights. Sorry for the rambling. But Bergmans auto can be topped and work great the fimming didn’t do as good but I. Have found a new LST me tian it is coming beautiful. Plant seed off centered then when it gets about 10 inches tall use some electrical wire and pull it to opposite side. So far best response.

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ILGM White Widow was amazing worth every penny! 17640

Some of the best HIGH and flavor I have ever haf