spots on stems of hydrandea and cone flowers - Knowledgebase Question

University Park, MD
Avatar for LynnHButler
Question by LynnHButler
May 21, 2006
I have two hydrangeas that have done well in the past. I noticed today black spots on the stems of the plants (also on my Cone Flowers). The leaves are fine and they have just started to bud. I also noticed this on a Hydrangea in a store today. Is this normal or do I have a problem?

Thank you.

Thank you, Lynn Butler

Answer from NGA
May 21, 2006
Brownish spots on hydrangea stems is quite normal but spots on the stems of coneflowers indicates either insect feeding or a disease. Closely inspect your coneflowers for pests and watch the leaves as they unfurl. If they, too, develop spots, there is a fungal or bacterial pathogen at work and you'll want to identify it and control it. Best wishes with your garden!

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