The Q&A Archives: Endless Summer Hydrangeas turning brown

Question: I recently bought 4 of your Endless Summer Hydrangeas. The leaves are turning brown/black and the flower heads are turning brown and dying. I went back to Stein's, Germantown, WI and asked. Got a lot of dumb looks for my trouble. I have several Monrovia plants in my yard and have come to insist on them. I would appreciate a prompt response on this. I like these plants and want them to do well.

Sarang, Rick catlin

Answer: Based on your description I suspect your plants may be affected by the fungal disease Anthracnose, however it is very difficult to make this type of diagnosis long distance. I would strongly suggest you consult with your local county extension to obtain a more specific diagnosis and based on knowing that, determine how to proceed. If the problem is something that would require or respond to a chemical control, they will have the most up to date information on what to use and how/when best to apply it. They may appreciate photos of the overall plant and closeups of the affected foliage to show the discoloration as it begins and progresses, as well as possibly some freshly taken samples kept cool and enclosed in a clear plastic bag.

In the meantime, water only as needed to keep the soil evenly moist like a wrung out sponge (dig into the soil with your finger, if it is still damp do not water yet), avoid wetting the foliage, do not handle the plants when they are wet, clean up any browned or blackened foliage and blooms and put them in the trash to reduce sources of possible reinfection, and do not fertilize them as this can exacerbate the problem.

I am sorry you did not receive a satisfactory response from your nursery. Please understand these are independent retailers that carry Monrovia (and other) products. Perhaps a word with the manager would help, but I can't speak on their behalf.

« Click to go to the homepage

» Ask a question of your own

Q&A Library Searching Tips

  • When singular and plural spellings differ, as in peony and peonies, try both.
  • Search terms are not case sensitive.

Today's site banner is by mcash70 and is called "Moss on a log"