Black spot appears as dark, circular spots on rose leaves, often with serrated edges. Over time, affected foliage turns yellow and drops. If left untreated, blackspot can spread to the canes, causing purple-red blotches that darken, blister and weaken the plant .

This fungal disease thrives in damp, humid conditions and spreads through water splashes from rain or overhead watering. While black spot spores don’t survive in soil for long, they can linger on fallen leaves, particularly during autumn when conditions are prime. To prevent this disease from seriously damaging your roses , gardening experts at Moowy recommend adding one key natural item – mulch.

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