Answer: Yellowing foliage on pampas grass usually indicates overly saturated soils. You can't control the rain, but you can make sure that the soil has an opportunity to dry out a bit between waterings. I think your new pampas grass might also be showing signs of transplant stress. It will overcome this problem once the roots establish, so in the meantime you can prune away the unsightly foliage and wait for new growth. Best wishes with your garden!
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