Can you mix grout and mortar together?

Mixing grout and mortar together is not recommended, as they serve different purposes and have different properties. Mortar is designed for bonding masonry units like bricks and stones, while grout is used to fill gaps and provide support in tile installations. Combining them can compromise the strength and flexibility needed for each application, leading to potential issues down the line. It's best to use them as intended for optimal results.