this is interesting, i logged on tonight to ask about knockout roses myself: my older knockouts (three years old) are beginning to have yellow leaves on the older growth, and reduced new growth (they used to produce new growth all over, now it is just one or two shoots from the base) I have also noticed a general 'yellowing' of other plants, not limited to older growth: daylillies, rosemary, carolina jasmine...seemingly unrelated. Any ideas to turn things around? thanks, mary
Just because it's drought tolerant doesn't mean they can never have a fungal disease. Make sure you're watering it at the roots and incorporate a couple of hand fulls of corn meal around the base of each plant. Spray weekly with Garrett Juice or something similar.
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