Answer: You could try planting a sun loving groundcover that likes heat and well drained soil such as a small sedum or creeping thyme into the sand between the stones. If you do not plant something, you will have weeds beginning to grow there. Or, you could try planting grass and then mow over the patio area as though it were part of the regular lawn. If you want to grow grass there, you should mix some good quality compost into the sand between the stones because grass does not thrive planted in sand -- it dries out too quickly. I hope this helps.
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