Plants, H2O Connoisseurs: Why Rainwater is the Gourmet Option

When it comes to healthy-looking plants, many gardeners have observed that all the tap water in the world can't compare to a couple of good inches of rainfall. According to Joshua Siskin, garden writer for the Los Angeles Times, "Rainwater collection is not just about saving water but about storing up a reserve of high-quality water for irrigation" (2017). 

So what's different about rainwater compared to what comes out of the tap?