I'm trying to make these pavers with grass inside them for use in a driveway.

Can someone help me to figure out how to contain the grass within the cells more accurately.

I tried making rectangle, (splines), in each cell and using those for areas but the grass goes so far outside the rectangles and I don't know how to refine it.

Thank You

Can someone help me to figure out how to contain the grass within the cells more accurately.

I tried making rectangle, (splines), in each cell and using those for areas but the grass goes so far outside the rectangles and I don't know how to refine it.

Thank You