Hard Yellow Gunk On Pot Plant??
A few of my pot plants are getting this hard yellow residue building up around the rim of the pot plant. There is none on the soil and the plants are otherwise healthy. Any clue what this could be?
Certified GKH Gardening Expert
That appears bacterial! This can happen when the soil is left too wet, for too long. Depending on the type of plant, most need to be completely dry down to about 2 inches or so between waterings to avoid infection. If the container has no drainage holes to allow extra water out, then you will want to wait until it is almost completely dry down to the very bottom between waterings.
You can try treating with a fungicide, but usually correct watering practices will resolve minor issues like this. As long as you aren't seeing any other symptoms, then it can usually be corrected with watering habit change.
This article will help you with fungicide use: https://www.gardeningknowhow.com/garden-how-to/info/using-fungicides-in-garden.htm