One application of fertilizer in the spring is usually sufficient for species roses such as Rosa rugosa and shrub roses. All other roses should be given their second application of a well-balanced fertilizer in mid-June or after their initial bloom period.
Monitor roses for black spot and other fungal leaf diseases. Remove infected leaves immediately and begin a preventative spray program with an approved fungicide at labeled intervals. Call Plant Information Service at (847) 835-0972 for effective fungicide recommendations.
Deadhead hybrid tea roses as soon as flowers fade. Many shrub roses are self-cleaning and don’t require deadheading. When in doubt, lightly prune old blossoms to keep plant looking attractive.