Can I save a plant with Fusarium wilt?

Unfortunately, there is no cure for Fusarium wilt once it takes hold. It is best to remove the plant to protect your other flowers.

Does yellowing always mean a disease?

No, it can also be a sign of poor drainage or too much water. Always check the soil moisture before assuming it is a fungus.

Why are my gladiolus leaves turning yellow? Causes and fixes

Check these first

Inspect the base of the plant for soft or mushy tissue.
Check the soil moisture level with your finger.
Look for signs of stunted growth compared to nearby plants.

Likely causes

Fusarium wilt
Most likely
How to tell: The leaves turn yellow starting from the bottom and the corm may show signs of rot. You might notice the plant wilting even when the soil is moist.
What to do: Remove and destroy the infected plant immediately to stop the spread. Do not compost the bulb. Treat the soil with a fungicide or avoid planting gladiolus in that spot for 3 to 5 years.
Overwatering
Possible
How to tell: The soil stays soggy for days and the leaves look limp or yellow. The roots may smell sour or look brown instead of white.
What to do: Let the top 2 inches of soil dry out before watering again. Ensure your planting site has excellent drainage or add grit to the soil to improve flow.

Yellow leaves on other plants

Find out what's wrong with your sword lily

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 yellowing spreads rapidly across the whole plant, it is likely a fungal infection that requires removal. Normal aging of the lowest leaf at the end of the season is fine.

Stopping it coming back

Plant your corms in well draining soil and ensure they have plenty of airflow. Avoid overhead watering to keep the foliage dry.

Sword Lily: yellow leaves? Check yours with a photo

Every plant is a little different. Take a photo of your sword lily 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

Can I save a plant with Fusarium wilt?: Unfortunately, there is no cure for Fusarium wilt once it takes hold. It is best to remove the plant to protect your other flowers.
Does yellowing always mean a disease?: No, it can also be a sign of poor drainage or too much water. Always check the soil moisture before assuming it is a fungus.

Guides to these causes

Fusarium Wilt

Why are my gladiolus leaves turning yellow?