The problem I've had with landscape fabric is that weeds start growing on top of it and through it. I have one heavy-duty piece that covers one pathway, and each spring for four years I've ripped it up and flipped it over.

The plan that's emerged for us over a period of years is grass/clover mix in wide corridors, and deep sawdust/wood chip mulch for the berries and fruit trees. The few weeds that come up through the mulch get well trampled during picking season.

Are they growing on top of fabric even without mulch placed over it?

We've got a very unique situation here where weed seeds come in by the millions all the time, and if grass/clover are grown in between rows these weeds are tough enough to establish within and spread over in no time.
Hoped fabric could cut that back.