Managing Black Spot on Roses: Spray Schedule & Low-Effort Options

Black spot on roses can't be eradicated—only managed. A gardener has a stellar year for roses, hydrangeas, daylilies but wants black spot control.

Traditional Spray Program

• Dormant spray: Lime-sulfur in November and March.
• Weekly from April: Alternate fungicides (e.g., Serenade, Neem, horticultural oil + baking soda, Green Cure). Coat both leaf surfaces.

Low-Effort "Just Say No" Approach

Remove infected leaves promptly. If plant defoliates, cut back—it will re-leaf in fall. Accept some black spot; focus on plant health over perfection. Many gardeners now skip spraying entirely.

Healthy roses tolerate black spot better. Good air circulation, morning water, and resistant varieties reduce severity.