QUESTION: Is ozonated water safe for plants? I have a machine that makes ozone water, and I know it’s good for disinfecting things and cities even use it to treat municipal water. But is it ok for watering my plants with? – Geraldine P.
ANSWER: Yes, it is perfectly safe to water your plants with ozonated water and will not harm them. In fact, there are studies that show that plants can benefit from ozonated water.
It’s actually very common for people in the indoor, hydroponic “hemp” industry (if you know what I mean) to use ozonated water as a way to sterilize their equipment, water the root zone for an oxygen boost, and spray it directly on plants to kill things like fungus, rust spots, spores, powdery mildew.
Testing has also shown that ozone water does not deplete plant nutrients. Specifically, lab tests have concluded that ozone does not affect phosphorus or potassium levels.
As you probably already know, when you make ozone water with an ozonating device, you need to use the water soon after you have made it. The half life of ozone in water is about 30 minutes, which means that half of the ozone concentration in the water will be gone by then. So you’ll want to water right after you finish making it for best results.