Can I Put A Thin Layer Of Clean Decorative 20ml Gravel On My Border Where I Have Tree Peonies Keeping It Away From The Root Base ,

Question

they are establish plants .thank you

Answer 1

It won't harm anything. If you provide irrigation then it will make it very difficult to determine when you need to water, but a moisture probe will mitigate this.

This article will help you to use a moisture probe to measure soil moisture:

https://www.gardeningknowhow.com/garden-how-to/soil-fertilizers/testing-moisture-in-plants.htm