Should I cut off the yellow leaves?

Yes, you can snip them off with clean scissors to help the plant focus its energy on healthy growth. They will not turn green again.

Can too much sun cause yellowing?

Blue Vervain loves full sun, so it is rarely the cause of yellowing. If the leaves look bleached or white, that is usually a sign of sun scorch.

Blue vervain: yellow leaves, causes and fixes

Check these first

Touch the top inch of soil to see if it is dry.
Check the drainage holes to ensure water is passing through.
Inspect the undersides of leaves for any signs of pests.

Likely causes

Underwatering
Most likely
How to tell: The leaves feel dry or crispy, and the soil pulls away from the edges of the pot. The plant will look wilted before the yellowing starts.
What to do: Water your plant thoroughly until liquid drains from the bottom. Maintain a schedule of watering every 2 to 4 days to keep the soil consistently damp.
Nutrient Deficiency
Possible
How to tell: The yellowing appears evenly across older leaves while the veins remain green. This happens when the plant has exhausted the nutrients in its soil.
What to do: Apply a balanced liquid fertilizer diluted to half strength once a month during the growing season. Ensure you are using a pot with drainage holes to prevent salt buildup.

Yellow leaves on other plants

Find out what's wrong with your blue vervain

The list above covers the usual causes. Pocket Botanist looks at a photo of your actual plant and tells you the likely cause, how serious it is, and what to try first. Identification and a health check are free.

When to worry

Worry if the yellowing spreads rapidly to new growth or if the plant stops producing new stems. It is normal for the very bottom leaves to yellow occasionally as the plant matures.

Stopping it coming back

Keep the soil consistently moist and provide a steady supply of nutrients during the active growing months.

Blue vervain: yellow leaves? Check yours with a photo

Every plant is a little different. Take a photo of your blue vervain and Pocket Botanist tells you which cause is most likely, how serious it is, and what to try first. A few checks a day are free. Save the plant and you get care reminders timed for it.

Get the app · Or check it from a photo now, free

Questions people ask

Should I cut off the yellow leaves?: Yes, you can snip them off with clean scissors to help the plant focus its energy on healthy growth. They will not turn green again.
Can too much sun cause yellowing?: Blue Vervain loves full sun, so it is rarely the cause of yellowing. If the leaves look bleached or white, that is usually a sign of sun scorch.

Guides to these causes

Dehydration

Why are my Blue Vervain leaves turning yellow?

Check these first

Not sure what's wrong with your blue vervain?