Rain water is the best!!!
I am interested in using rain water for watering my trees. I currently have to buy water because of poor water quality here. Has anyone who uses rain water had any trouble with pollution in the water harming your trees? Do you use any sort of filtration or just use raw rain water?
Since collecting and using only rain water now, all of my bonsai and pots have never looked better....but it always wasn’t that way. When I was living in the Chicago suburbs I used “city water” that came from Lake Michigan
and my bonsai did well, so I thought. After I learned how most city water was treated I had seconds thoughts on
using it. I then tried RO (reverse osmosis) water and noticed little effect. Since then, I moved to rural west central Michigan and had to use well water which had the biggest effect on my bonsai. Growth was more lush and the Autumn colors on my maples was the best I’ve ever seen however there was one side effect that made me look elsewhere for my bonsai water source. The side effect was a white residue that was collecting on trees and pots. It appeared that the source of the water in my well was from a mineral spring at 128 ft....which had a pH of 7 and a total hardness of over 425 ppm. (very hard water).
Most of my trees at first had little negative effect of the hard water except for my ezo spruce and sekka hinoki which were showing signs of stress. My pots were also showing heavy mineral deposits which looked unsightly. I did some research on the long term effects of very hard water on bonsai trees and it wasn’t good. That’s when I decided to test my rain water and was pleasantly surprised. The rain in my area of Michigan had a pH of 6 and a total hardness of zero! While the rain water was slightly acetic (which my conifers liked), the water was very soft with zero mineral deposits.
I now have two 65 gallon rain barrels by EarthMinded, made from durable food grade HDPE resin in USA. Both barrels are connected together which diverts rain from my gutter. With as little as 1”-2” of rain, both barrels are filled quickly and I have a renewable source of pure rain water for all my bonsai.
I have since had the water tested for any possible roof containment’s which none could be found. My bonsai have never looked as good with the change over to collected rain water.