Q.How Deep Do You Plant Mazus
I am planning on planting Mazus between stepping stones. There is some kind of gravel under the soil where the stepping stones are situated. I need to make sure there is enough soil under the Mazus.

Certified GKH Gardening Expert
Mazus is suitable for a rock garden, the gaps in a rock wall, and between stepping stones, so it should be fine in your soil. You would only plant it as deep as it is already growing in a container. You could work in some compost to be sure there is enough soil.
https://www.gardeningknowhow.com/ornamental/groundcover/mazus/growing-mazus-reptans.htm