Will soap and water sprayed on my hydrangeas help get rid of powdery mildew?

Milk will help with the powdery mildew. You can either use it full strength or mix it with half water. Just put it in a spray bottle and spray the heck out of your plants. The milk will dry and form a coating on the plant that will basically suffocate the powdery mildew growing on the leaves. Make sure to get under the leaves as best you can. You will have to do this weekly or every time it rains it will need redone. The best thing is that it is totally harmless to you, your kids, or your pets. and Milk is a lot cheaper that the harsh chemicals they sell on the market.

Will soap and water sprayed on my hydrangeas help get rid of powdery mildew?
rubbing alcohol works excellent for snowy mildew and aphids,on orchids doesn't hurt the plant a bit,should also work on ur problem
Reply:Steviewag had the best suggestion so far. One T. baking soda to a gallon of water, sprayed on the leaves, repeat after a rain. This changes the pH on the leaf surface and resists mildew. Clean up any leaf debris on the ground, since spatter will re-infect the clean leaves. If you water the shrub, water at ground level.





Powdery mildew is exacerbated by high humidity. Anything you can do to improve circulation around your hydrangea will help.
Reply:before it spreads like crazy, get out the fungicide and spray everything......I almost lost all my tip cuttings on hibiscus from powdery mildew....then, I even had to use a Banrot soil drench on them....good luck
Reply:Buy Benomyl, follow container spray instructions. Be aware it is quite expensive but it does work.
Reply:Nope. Unfortunately for any mildew, you are better to use an anti fungal spray, or copper sulphate. Ivory dish soap and water is used mostly to rid yourself of aphids or other "soft shelled" pests. You can check with your local garden center to find the fungicide which best suits the needs of hydrangeas. Best of luck
Reply:Organically, use 1 tsp. baking soda in 1 litre or quart of warm water to dissolve it. Spray over and under leaves. It will dry to a powder, washed by the next rain. It will slow the process, but not kill the mildew. Sulphur is another anti-fungal agent, used more specifically for black spot on roses.
Reply:No you will need a mildew spray
Reply:I use garlic water for my roses, and Hydrangeas, it repels aphids on my roses, and keeps bugs off my hydrangeas.
Reply:I have heard that powdery mildew will only grow in a specific ph range. It you keep your plants sprayed with 1/2 milk 1/2 water - it changes the ph enough on the leaves that the mildew will not grow.





It will NOT get rid of powdery mildew that is already there. Just prevent more.





I have not yet tried this out; but I'm planning to on my roses next year. But right now, it's going into freezing season...so I wn't be seeing any powdery mildew until next year.