Growth On Silvia Stem

Question

this growth showed up on several stems of Silvia plant. When it is watered it sends out a “smoky” plume. Is it dangerous and should the plant be removed?

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Answer 1

This is the, aptly named, Dog-vomit fungus, or Fuligo septica.

They have reached the sporulation stage. This is quite the beneficial creature, though. They feed, strictly, on bacteria. Likely, they are present because your plant has a bacterial infection. This "fungus" is doing what it can to help you rid your plant of that infection. Treating with a fungicide will be a good idea, here.

This article will help:

https://www.gardeningknowhow.com/garden-how-to/info/using-fungicides-in-garden.htm