[wideminded]

Many companies introduce C02 into a hydroponic environment to grow red and yellow peppers into plants as high as 40 feet tall that produce year round harvests

My pepper plants aren't doing quite that well. I'd be interested in reading more about this but I'll try to find my own links. I wonder if any of these techniques are usable by individual gardeners.

[Vendome]

You need a closed environment that is highly regulated.

Not cheap.

You might be able to do it in a simple “Home” green house.