It might be that the Choisya leaves that are turning black were ones that were frost damaged. I've lost leaves from the "Sundance" after frost damaged them, I don't remember if they went black but definitely dark brown and then they fell off. I now overwinter it in the greenhouse.
My Sundance doesn't look too good this year. Half of it is going brown. I am thinking of digging it out and remodelling that part of the garden. Perhaps they are not too long lived?
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It might be that the Choisya leaves that are turning black were ones that were frost damaged. I've lost leaves from the "Sundance" after frost damaged them, I don't remember if they went black but definitely dark brown and then they fell off. I now overwinter it in the greenhouse.
My Sundance doesn't look too good this year. Half of it is going brown. I am thinking of digging it out and remodelling that part of the garden. Perhaps they are not too long lived?
thanks for your replies.
I will try washing with soap and spray after.