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Allan designs and plants flowering gardens in Montreal, Zone 5 [USDA Zone 4] .

See website, design work and favorite flowering plants at

Consultation and coaching for do-it-yourselfers is provided. Occasional emailed questions are welcome and answered free of charge. Oui, je parle francais.

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About Fighting Black Spot on Roses.

Image courtesy of About.comMarie Iannotti, who writes Marie's Gardening Blog at Guide to Gardening, has posted an article describing an environmentally safe protein, sold as Messenger, that helps the immune system of roses fight black spot. The product that she writes about and the scientific explanation behind it are outside of my field of expertise. In addition, I do not grow roses that are susceptible to black spot; I have abandoned the hypnotic aromas and tropical colors of disease-prone roses in order to grow disease-resistant roses, instead. However, anytime I read about a natural process for controlling any garden disease, I like to share that knowledge. After reading Marie’s article, scroll down to the links at the bottom of her page for additional information about this product. Readers who have used Messenger in their garden are invited to post their opinions about it in my comment box.

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Reader Comments (2)

I agree with you Allan, I don't fight blackspot too much anymore. I buy roses that are resistant. But, I do fight the Japanese Beetle. Any solutions that are effective?


April 5, 2010 | Unregistered CommenterEileen

Thanks for this very beautiful and spectacular post. Really, I appreciate yours fabulous article. I also appreciate to you for your well planned gardens.
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