Will my Blue vervain bloom in partial shade?

It might produce a few flowers, but the spikes will be smaller and fewer in number. Full sun is best for a showy display.

Should I deadhead the flowers?

Yes, removing spent flower spikes can encourage the plant to put energy into new growth or a second flush of blooms.

Why is my Blue vervain not flowering? Causes and fixes

Check these first

Observe the plant for 6 hours to see if it stays in direct sun.
Check the soil moisture to ensure it is not drying out too much between waterings.
Inspect the plant for any signs of overcrowding.

Likely causes

Insufficient sunlight
Most likely
How to tell: The plant looks tall and stretched out with large gaps between leaves. It is not receiving the full sun it craves.
What to do: Move the pot to a spot that receives at least 6 to 8 hours of direct sun daily. If it is in the ground, ensure no nearby trees or shrubs are casting shade on it.
Nutrient imbalance
Possible
How to tell: The foliage looks lush and green, but no flower buds appear. This often happens if the soil has too much nitrogen.
What to do: Switch to a balanced, water soluble fertilizer with a higher middle number for phosphorus. Apply it once every 4 weeks during the growing season to encourage bud production.

Other plants that won't flower

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

If the plant is healthy and green but has not flowered by late summer, it may need a better location for next year. It is normal for young plants to skip their first year of blooming while they establish roots.

Stopping it coming back

Keep the plant in full sun and maintain consistent soil moisture throughout the spring and summer.

Blue vervain: not flowering? 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

Will my Blue vervain bloom in partial shade?: It might produce a few flowers, but the spikes will be smaller and fewer in number. Full sun is best for a showy display.
Should I deadhead the flowers?: Yes, removing spent flower spikes can encourage the plant to put energy into new growth or a second flush of blooms.

Why is my Blue vervain not flowering?