Skip to content
Pocket Botanist
Get the app

Giant Onion · Allium giganteum

Why are my Allium giganteum leaf tips turning brown?

It is less common for this plant to have brown tips, which usually happens due to inconsistent watering or salt buildup in the soil. Check your watering schedule to ensure the soil is not drying out too severely between drinks.

Not sure it's this? Check a photo of your plant for free

Check these first

  1. Check if the soil has been bone dry for too long.
  2. Review your recent fertilizer application schedule.
  3. Feel the texture of the brown tips to see if they are crispy.

Likely causes

  1. Inconsistent Watering

    Most likely

    How to tell: The leaf tips turn crispy and brown while the rest of the leaf remains green. This happens when the plant goes through long periods of extreme drought.

    What to do: Establish a consistent watering routine every 7 to 14 days during the growing season. Ensure the water reaches the root zone thoroughly each time.

  2. Fertilizer Burn

    Possible

    How to tell: Brown tips appear shortly after you have applied a heavy dose of fertilizer. The edges of the leaves may also look scorched.

    What to do: Flush the soil with plenty of plain water to wash away excess salts. Avoid fertilizing until the plant shows signs of new growth.

Brown tips on other plants

Find out what's wrong with your giant onion

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.

Download on the App StoreGet it on Google Play

When to worry

Minor browning at the very tip is common as the plant ages. You should worry if the browning spreads rapidly down the leaf or affects new growth.

Stopping it coming back

Keep the soil moisture steady and avoid over fertilizing during the peak growing season.

Giant Onion: brown tips? Check yours with a photo

Every plant is a little different. Take a photo of your giant onion 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.

Download on the App StoreGet it on Google Play

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

Questions people ask

Should I trim the brown tips off?
You can trim the brown parts with clean scissors for aesthetics. Just avoid cutting into the healthy green tissue.
Does tap water cause brown tips?
Sometimes high mineral content in tap water can cause salt buildup. If you suspect this, try using filtered water for a few weeks.

Guides to these causes

More problems with Giant Onion

Back to the Giant Onion guide

This article was generated with AI on from the plant’s care profile and is general information, not horticultural advice. Read about how we build these guides.