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Hydroponics is a subset of hydroculture and is a method of growing plants using mineral nutrient solutions, in water, without soil. [wikipedia]

My question is if is it possible to grow any kind of plant soilless (hydroponics)?

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Yes, There are a few i know of, a quick "air plant" google search will get you quiet a lot. wiki 1 wiki 2

Edit: I just glanced through the hydroponics article, and now I wonder if my answer actual answers your question.

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Thanks for quick reply, I didn't know about the title Epiphytes. I still think, there are maybe for some reason "impossible to grow without soil plants" but I don't know. I want to wait and search a little more. –  pikk Apr 20 '12 at 9:04
    
from what i have read so far, plants do not need soil to grow. You can grow potatoes in a pot just filled with water, they don't need the soil as long as they get the nutrients and oxygen from their surroundings. –  stackErr Apr 20 '12 at 11:08
    
....so I dont understand what you are trying to ask. @pikk –  stackErr Apr 20 '12 at 11:13
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Yes it is possible, and as far as I can see, there should not be any plant which would be impossible to grow in a such an environment, just more or less difficult, although this is just my speculation.

I have myself grown tomatoes from only a liquid solution of minerals and nutrients, but you have to change the solution from time to time to prevent bacteria and fungi growing starting to grow in it. The reason why this is not a method used in industrious growing is because it is a lot more expensive than using soil and fertilisers, and more work.

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Do you have a source for the fact that it is a lot more expensive and requires more work ? Thanks. –  ChrisR May 31 '13 at 12:29
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