My three Montauk Daisy (Nipponanthemum nipponicum) plants -- which have done fine for the past 6 years in this irrigated garden bed -- suddenly wilted and began turning brown. I assume it's a fungal disease, but I have not been able to find a diagnosis online. I'm wondering if anyone has had the same experience. I'd like to replace them with the same type of plant. Thanks for any advice.
