Answer: It isn't likely that weeds will grow in the pine needle mulch, especially if you put weed block fabric down first. Pine needles are acidic which will keep most weed seeds from sprouting if they happen to travel in by the wind or are dropped by birds. And, I've found that if weeds do sprout in a thick layer of mulch they are extremely easy to pull because their roots are in loose mulch as opposed to firmly entrenched in soil. I think your plan is an excellent one. Enjoy your garden!
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