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I was also just thinking about this... Seems like if you could get at least a foot or two of good soil if 10 or 20 percent of the roots were floating, they would take care of plenty of water without full-on root rot.
Wouldn't this be like hempy if it worked out? Probably the scary thing is what if the water table did change at all... like a week of rain where I'm at would probably drown a plant that close to the water.... hmmm
I read a great description of this back in the OG days and you made me smile with nostalgia.
As for how it works, basically you just cut the bottom off a bucket, dig a hole till you reach the water table (nice and high in the swampy area), and fill the bucket with soil. What this does is basically provide a reservoir of water for the plant to reach down to. Since the top 1/2-3/4 of the bucket is above the original soil level you have plenty of non-waterlogged soil for the plant to grow in but once its big enough to demand more water, it can send roots down into the swamp. Pardon my ascii skills but it should look like this:
------- | | <----Bucket w/ no bottom -------| |-------- Soil level /\/\/\/\/|____|/\/\/\/\/\ Water table
Now, if I were to do this I would try to find some nice 1'-2' diameter corrugated black drainage pipe and drill a shit load of holes in the sides much like an air-pot. That way I can make it a bit taller than a 5gal bucket, thus more non-waterlogged soil, and still let the plant grow down into the water when it needs it.
The benefits of this system are many, firstly, nobody goes into swampy areas usually (though you will want to watch for waterfoul hunters...). Secondly, the soil in swaps is loaded with nutrients, and last but probably the most important, your plants will never need to be watered.