Pocket BotanistCheck these first
- Test your soil pH to ensure it is between 4.5 and 5.5.
- Check the soil moisture to see if it is waterlogged.
- Inspect the leaves for any signs of pests.
Likely causes
High soil pH
Most likelyHow to tell: The leaves turn yellow while the veins remain green, indicating iron chlorosis.
What to do: Apply an acidic fertilizer formulated for ericaceous plants. You can also mix in peat moss or sulfur to lower the pH of the soil.
Overwatering
PossibleHow to tell: The leaves look pale and limp, and the soil feels soggy or smells swampy.
What to do: Ensure the container has drainage holes so water does not pool at the bottom. Allow the top half inch of soil to feel damp but not saturated.
When to worry
It is normal for the oldest leaves at the base to yellow and drop as the plant grows. Worry if the yellowing is spreading rapidly across new growth.
Stopping it coming back
Use rainwater or distilled water instead of tap water to avoid mineral buildup that raises pH.
Not sure which one it is? Photograph your bog rosemary.
This page lists the usual causes. Pocket Botanist looks at your actual leaf and tells you the likely cause, how serious it is, and what to try first. Identification and a health check are free.
Questions people ask
- Can I use regular potting soil?
- No, regular potting soil is usually too alkaline and lacks the necessary drainage. Always use a mix designed for acid loving plants.
- Will the yellow leaves turn green again?
- Usually no. Once a leaf has turned yellow, it will likely drop off, but fixing the soil will help the new growth emerge healthy.
More problems with Bog rosemary
Back to the Bog rosemary guide
This article was generated with AI from the plant’s care profile and is general information, not horticultural advice. Read about how we build these guides.