Best option for a flagstone area to get grass or moss grow?

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Hi, Fellow Hometalkers. What is the best option for a flagstone area to get grass or moss growing between the flagstone? The area has decomposed granite between the flagstone and was installed over builder sand and granite also. I found a small pic of the area-- it is a flagstone area that is 50' long and 30' wide. I live in Texas, so heat is always an issue where stone is concerned.
I appreciate your ideas!
q moss or grass options
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