Answer: I wonder if the rubber mulch absorbed and radiated too much heat for the plants? Organic materials such as bark nuggets or chips are not as solid as the rubber mulch and may not react the same way in the sunshine. I can't think of any other reason for an adverse affect on plants unless your client spread a pre emergence product before laying the mulch. Pre emergents stop weed seeds from germinating by releasing a gas - I wonder if it was trapped beneath the rubber mulch as opposed to being able to dissapate through more conventional ways and therefore harmed the plants? Bermuda is persistent. A pre emergent should control reprouting once you pull out the existing plants. Wish there were an easier solution!
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