Do it the RIGHT way if you can, hire a landscaper that will remove 90% of the stone. The weeds and a ton of seeds will leave with it, put down fresh FABRIC and fresh stone. Prefer the flat gray Shalimar for best anti-weed results. The river rock in a smaller size is a distant 2nd. If there is a grassy looking weed coming through IN YOUR SHRUBS... I suggest having the them (the shrubs) removed ROOTS AND ALL, and replaced as well. Without seeing, I can't tell if you have invasive weeds that will return pretty quickly.
Follow up with PREEN, 2x the amount, and 2x as often as the package recommends for the 1st year. This method should cost around $4.50 to $6 per square foot.
If this is beyond your means financially. LARGE PINE BARK, at least 6" thick (9" would be better) on top of the rock. Spraying the weeds with round up 1st would be a big plus. I have killed thick burmuda grass in landscape beds by this method. This should cost about $2 per square foot.
Some here may disagree, but I have tried every method deemed reasonable over my 40 years of dealing with exactly this problem, and these are your 2 smartest methods, and both give immediate results, and long term benefits with a minimum of additional $$ and time thrown at the problem in the future.
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