Powdery mildew is hard to get rid of once it has started. The copper helps a bit, but it is really something that should be applied to the plants before the mildew starts. But it is hard to know that since you don't realize you have a problem until the mildew appears.
I would suggest trying to get rid of as many plants that have signs of the mildew before it spreads to your other plants. Or at the very least cutting the leaves that are showing the worse signs of it- also make sure you burn the leaves or dispose of them in the trash because the powdery mildew will over winter and show up next year in your garden. That way you can salvage what you have left. Also your neighboring gardeners would be very grateful because the powdery mildew will quickly spread to their plants as well.
Also if the copper spray doesn't work. I have had luck with spraying my plants with a mixture of 10% milk and 90% water. You can also try washing the leaves when they show the beginning signs of powdery mildew. That works really well. I just use soap and water. I use Dr. Bronner's Soap because it is all organic and it won't hurt the plants or damage your soil. And your soil is the most important part of your garden. "Gardeners don't grow plants. They grow soil."
Good luck. Sorry I stuck my nose in here with all sorts of advice, but I have had problems with PM before and it is very distressing. Found my way over via Food Porn and your garden pictures sucked me in. I am a sucker for garden pictures. It is my most favorite of all my hobbies.
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I would suggest trying to get rid of as many plants that have signs of the mildew before it spreads to your other plants. Or at the very least cutting the leaves that are showing the worse signs of it- also make sure you burn the leaves or dispose of them in the trash because the powdery mildew will over winter and show up next year in your garden. That way you can salvage what you have left. Also your neighboring gardeners would be very grateful because the powdery mildew will quickly spread to their plants as well.
Also if the copper spray doesn't work. I have had luck with spraying my plants with a mixture of 10% milk and 90% water. You can also try washing the leaves when they show the beginning signs of powdery mildew. That works really well. I just use soap and water. I use Dr. Bronner's Soap because it is all organic and it won't hurt the plants or damage your soil. And your soil is the most important part of your garden. "Gardeners don't grow plants. They grow soil."
Good luck. Sorry I stuck my nose in here with all sorts of advice, but I have had problems with PM before and it is very distressing. Found my way over via Food Porn and your garden pictures sucked me in. I am a sucker for garden pictures. It is my most favorite of all my hobbies.