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Posted 1Y ago by @GoodSmoothrose

Knockout Rose plant yellowing -not sure what to treat for...

These knockout roses were doing pretty great to start off and then started noticing some yellowing leaves in the middle about 3 weeks ago. Not sure to treat for black spot because I don’t see any big black spots or if it is just too much sun? Should i remove the branches with yellow leaves or just let it be?
@sarah10orio
still Sarah
275271 XP
1Y ago
@sarah10orio
Hi, Helen! This is what mine look like when I'm not watering them enough.

Are these planted directly in the ground?
@sarah10orio
still Sarah
275271 XP
1Y ago
@sarah10orio
Not enough water + hot sun can equal yellowing leaves. Especially when they are along the outside of the plant. Mine also appreciate fertilizer the the spring to get them through our hot summers.
@clairsheart
Clair Evans
73843 XP
1Y ago
@clairsheart
@sarah10orio Yellowing of rose plant leaves can be caused due to a variety of reasons, including fungal disease, insect pests, and environmental stressors. Common causes of rose leaves turning yellow include overwatering, underwatering, a lack of sunlight or nutrients, and over-fertilizing. However, deficiencies of iron and nitrogen in the soil are also a common cause of yellowing of the leaves.
@GoodSmoothrose
Helen
1513 XP
1Y ago
@GoodSmoothrose
@sarah10orio yes in ground - we did some trimming of the yellow leaves and have been deep watering as you said and so far everything looks good thanks so much!! Do you have any fertilizer recommendations?
@sarah10orio
still Sarah
275271 XP
1Y ago
@sarah10orio
@GoodSmoothrose there's actually something called Rose Food that's pretty good! Personally, I like Jobe's Rose Fertilizer.