Can the plant recover from borer damage?

If caught early, you can save the plant by removing the larvae and the damaged parts of the rhizome. If the damage is extensive, it is best to remove the plant entirely.

How do I know if it is just thirsty?

If the plant perks up within a few hours of watering, it was likely just thirsty. If it stays wilted, you have a more serious issue like pests or root damage.

Why is my Siberian Iris drooping?

Check these first

Check the soil moisture at the base of the plant.
Inspect the base of the stems for signs of tunneling or larvae.
Look for chewed leaf edges that might indicate pests.

Likely causes

Iris Borer
Most likely
How to tell: The leaves wilt and droop, and you may see chewed edges or slimy tunnels at the base of the stems. This is caused by larvae boring into the rhizome.
What to do: Dig up the affected rhizome and remove any larvae you find. Destroy the damaged plant parts and replant healthy sections in fresh soil.
Underwatering
Possible
How to tell: The leaves look limp and dry, especially during hot, windy weather. The soil around the base feels dusty and dry to the touch.
What to do: Water the plant deeply, ensuring the soil is moist at least 6 inches down. Maintain a consistent watering schedule of every 7 to 14 days.

When to worry

Drooping that does not recover after a deep watering is a major red flag. If the rhizome feels mushy or hollow, the plant is likely infested or rotting.

Stopping it coming back

Keep the garden bed free of debris and monitor for borer activity in early spring when the larvae are active.

Not sure which one it is? Photograph your siberian iris.

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.

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Questions people ask

Can the plant recover from borer damage?: If caught early, you can save the plant by removing the larvae and the damaged parts of the rhizome. If the damage is extensive, it is best to remove the plant entirely.
How do I know if it is just thirsty?: If the plant perks up within a few hours of watering, it was likely just thirsty. If it stays wilted, you have a more serious issue like pests or root damage.