You can put week block under the sand or gravel base to keep plants at
bay. Anything that does grow is easy to pull.
I guess that is OK if you like pulling weeds.
Glad you understood that I meant to write "weed block."
No, don't like pulling weeds but it's amazingly easy with the weed
block in there. Roots and all come up easily and nothing that
requires a tap root will grow through the block. Most offenders have
surface roots and are pulled up easily.