2 liter soda bottle, flower pot and a little gravel is all it takes. Sink flower pot into ground at base of plants add gravel ( it helps with drainage) and soda bottle. .Fill with water or fertilizer and all goes directly to the roots. I did mine when plants went into ground this spring. A couple times I had to hose them out because holes get plugged. On a large scale this would not be easy, but for the small home gardens it works very well. Small flower pot with a little pea gravel in it and sunk into ground. ( photo / image / picture from Donna S's Garden ) 2 liter soda bottle with small holes drilled in cap. Bottom cut off. ( photo / image / picture from Donna S's Garden )
I did that once when we went on vacation. I put 40 liter bottles I saved, in the garage, filled with water and my friend had to simply swop out the bottles for me while I was gone. She didn't mind it at all and happily took home fresh tomatoes for her not-so-hard-work each day!
