Permanent mulching

I have a raspberry bed that is approximately 45' x 20'. Is it wise to put a more or less permanent mulch of landscape fabric and gravel in the bed?
I have used newspaper and straw in the past.
Are there any drawbacks to using fabric and gravel?
Sincerely,
Stuart Pedazzo...but you can call me Stu!
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not a good idea. The new canes need to be able to push through. Use wood chips or leaves, and replenish as needed.
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