My miniature rose has a white powdery substance on it...

Powdery mildew can be hosed off. I'm not certain without seeing it

Hi Darlene, Here's video that may help! https://www.youtube.com/watch?v=pxnfn2fDjck

Good luck!

Sounds like mildew to me. Here are a couple links to help you out. If this is not the problem, let us know, we can figure it out and solve the problem.

https://www.gardeningknowhow.com/ornamental/flowers/roses/roses-powdery-mildew.htm

http://www.rosemagazine.com/articles02/pages/mildew.asp

It is most like powdery mildew. There is a manufacturer that goes by "safers" and they make a fungicidal soap that is environmental, pet, people safe. I have used it myself. Good luck,

You can get rid of powdery mildew by spraying it with a mixture of half milk and half water. You will need to spray it every couple of days until the mildew is gone, then once a week to prevent it from returning.

I used this on my lilacs and it worked great!

Thank you I will give it a try

Thanks I'm going to try it