The title of the thread, Â "Garden vs Containers" is one that has been debated on this website and others for many many years....
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I, for one grow in containers because I don't have a "garden". Â Every plant I grow is either in a bed or in containers and has been for a long time....
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Soil type/quality is of utmost importance when growing peppers and I, for one have found that I can control what nutrients the plants get when I grow in containers enough I get 7 foot plants...I have posted pics of my pepper plants in the past and they get absolutely huge in 5 gallon nursery containers....I am on a drip fertigation system I designed/developed myself with automated timers to adjust the volume/flow of food/water the plants get...let me announce right now, not all my plants get that large...
...but the Bhut/Naga and Trinidad varieties do get that large...
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Genetics is also a huge factor and I won't try and explain it because you all know what I'm talking about...
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After seeing my cousin grow the scorpion plants for me a couple of years ago using a similar feeding/watering schedule in the ground, If you want huge plants and lots of pods that could be used in a commercial operation, ground is the way to go...
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Geeme....the only plant that I leave outside and has survived the past 3 or 4 winters is my wild Tepin...it seems I has a will of it's own to survive....and we had a "hard" winter for North Texas this past year...my mother has the sister plant to this one planted in one of her flower beds down in Pensacola....
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the key to growing peppers is to find out what works for you, then tweak that system every year with new knowledge that has been learned since the last season....no matter how you grow, after a few years, your plants will be beautiful, large, and very productive...