Distilled water has been purified by a process called distillation, which is the evaporation and later collection of any liquid through condensation. Although you can drink it, some people say distilled water tastes flat or less flavorful than tap or other bottled water. However, tap water has additives, which might not be good for you or your plants, so many people believe in using distilled water on their plants.
Lack of Chemicals Benefits Plants
Chlorine, fluoride and other chemicals are added to the public water supply to make water safe for human consumption. When you water your houseplants with standard tap water, the effects of these chemicals are more direct than when you water outdoor plants with tap water because potted indoor plants receive no other source of water, such as rain. The chemicals in tap water can harm your houseplants, according to the Professor’s House website, so many people believe that distilled water is superior for their health.
Soft Water is Better for Plants
Much municipal tap water and well water is hard, meaning it has many minerals. People who live in areas with wells or other hard water often use water softening systems to remove the minerals, and the hardness, of their water. But water softeners use salts, which can badly damage both indoor and outdoor plants. Because distilled water contains no minerals, it is considered soft, and safe for all plants.
Distilled Water is Not Acidic
Even rainwater can have an acidic component that can harm plants. When you use distilled water for your plants you will avoid any acids that might be in tap water or rainwater.
More Fertilizer Might Be Needed
Although plants can benefit from the lack of chemicals, salts and acids in distilled water, they might need additional minerals that this type of water does not contain. Giving your indoor and outdoor plants an appropriate fertilizer at correct time intervals will give them the nutrients they need, which might be absent from the distilled water you have chosen to give them. Because tap water in different communities can have varying levels of minerals, you can help your plants to optimum health by fertilizing them, regardless of the type of water you use.