Fertilize roses for the third and final time at the end of the month with a liquid 20-20-20 fertilizer. Do not fertilize after August 1.
Continue to deadhead roses by cutting flowers back to the first set of five leaflets.
Monitor roses closely for blackspot. Remove any leaves that show darkened circles with fuzzy margins on either the topside or underside of leaves; yellow foliage with dark spots; and any leaves that have already dropped from the plant. Begin a spray program with approved fungicides immediately. Always choose disease-resistant roses in the future.