I have Nana Nadina's that appear to have some black spots on them and one of them looks like its dying. They get partial sun (mornings) and sit in well drained, mulched beds. Automatic watering twice weekly using buried soaker hoses. On this variety the leaves will curl some but these appear to be yellowing and turning brown with some black spots on the back. I am in Grand Prairie Texas where the soil is alkaline unless treated. These beds are well mulched. How should I treat these Nana Nadinas?
Dallas County Texas nandina
Thank you for your question. I'm afraid the holiday got in the way of our getting you a timely answer. To avoid further delays, please contact the Texas A&M AgriLife Extension Service office in Dallas County directly - the Master Gardeners there operate a helpline. Go to http://dallas-tx.tamu.edu/horticulture/need-help/ for hours of operation and the phone number.