Q.How Do We Plant Groundcover Between Pavers In A Patio?
We want to build a patio with 24” square pavers and they need to be set in a compacted bed of crushed stone and sand. We want to keep a 2” space between the pavers to grow groundcover. If we buy a mat of groundcover, how is the best way to plant it so it survives? If we lay a little soil over the sand, will that suffice? We live in San Diego and plan to use drought tolerant ground cover and have an irrigation system to help get it established.

Certified GKH Gardening Expert
You can, certainly, opt for a thin layer of soil! That will open up the types of plants that you can use, quite a bit.
Here are some articles to help you to choose plants That will work best for the area, whether you choose to amend it or not:
https://www.gardeningknowhow.com/garden-how-to/info/plants-for-cracks-crevices.htm
https://www.gardeningknowhow.com/ornamental/groundcover/gcgen/planting-between-pavers.htm