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I like Kali Mist by Serious Seeds, here's one I'm harvesting in the morning - 14" from bucket rim to top cola and will produce 3+ liters of cured bud.
Here's a Kali Mist I did with 4" over the bucket rim.
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Another great short big producing plant is Big Laughing by Dr Greenthumb. Single Stemmed I can veg my pheno to 16" and get 50% stretch to get a 24" plant every time. It's potent enough that 1/3 of a volcano bag will send my friends into a stupor staring at the wall for 15 minutes. It has amazing lower branches that spiral rather than trade sides of the plant, it alows for cola sized lower branches that I had to support with a tomato cage. Good producer, the plant below didn't fill out because I had a poorly developed root system but I still got 6 cups of cured bud.
http://www.drgreenthumb.com/cannabis_seeds_GreenthumbSeedsEntrance.htm
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AK47 by Serious Seeds is said to have very little stretch during flower, if you grow your mother out from seed then take cutting for clones and flower the clones as budcicles you may be able to keep your plants short.
http://www.cannabis-seeds-bank.co.uk/serious-seeds/cat_6.html
I would look into types of training as Sea Of Green (short clones), SCReen Of Green (low stress training of the stem (bending) around a screen); or Crop Circle Of Budd (bending the stem around a bucket rim, as with the Kali Mist above.) Train your plants and you can grow any strain you want in 3'. Here's some Strawberry Diesel I grew with 6'6" of stem with only 6" of height above the bucket rim. (CCOB)
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Here's some CCOB in training and done, SOG and SCROG can be found in the FAQs.
https://www.rollitup.org/seed-strain-reviews/211186-pics-my-garden-ssd-km.html
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A lot of the Auto flowers will stay very short, but my Taiga got 33" under only 12 hours light. Careful of your choice, pick and extra short one. Auto AK47 is suppose to be potent.
http://www.cannabis-seeds-bank.co.uk/auto-flowering-seeds/cat_43.html
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