Answer: You didn't say how long your agapanthus has been planted in the ground. If you just recently installed them, they could be going through a little transplant shock. If you keep them well watered they should adjust in a few weeks and you'll see new growth. It's natural for some of the older leaves to turn yellow and die; these will be replaced by healthy new leaves as the season extends. I'd just be patient with the plants - I think they'll snap out of it soon. Best wishes with your garden!
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