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Canna lily · Canna × generalis

Why is my Canna lily looking so tall and leggy?

Cannas are sun lovers that stretch out when they do not get enough light. Check your plant's location to ensure it is getting plenty of direct sun.

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leggy growth on a plant
Photo: Rosser1954, CC BY-SA 4.0

Check these first

  1. Observe how many hours of direct sun the plant receives.
  2. Check if the stems are leaning toward a window or wall.
  3. Review your recent fertilizer schedule.

Likely causes

  1. Insufficient Light

    Most likely

    How to tell: The stems are thin and weak, and the plant leans heavily toward the nearest light source. You will notice large gaps between the leaves.

    What to do: Move your pot to a spot that receives at least 6 to 8 hours of direct sunlight daily. If you are growing indoors, place it in your brightest south facing window.

  2. Excessive Nitrogen Fertilizer

    Possible

    How to tell: The plant grows very fast but the stems are too soft to support the foliage. It often looks lush but flops over easily.

    What to do: Switch to a balanced fertilizer with a lower nitrogen ratio, such as a 10-10-10 formula. Apply it once every 4 to 6 weeks during the growing season instead of more frequently.

Leggy growth in other plants

Find out what's wrong with your canna 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.

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When to worry

It is normal for Cannas to grow tall, but if they are falling over or unable to stand, they need more light. This is rarely fatal but makes the plant look messy.

Stopping it coming back

Keep your Canna in full sun all day long to ensure strong, thick stems.

Canna lily: leggy growth? Check yours with a photo

Every plant is a little different. Take a photo of your canna 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.

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Questions people ask

Can I prune a leggy Canna?
Yes, you can cut back the stems to encourage bushier growth. Just be aware that this will delay flowering for a few weeks.
Will a leggy Canna recover?
The existing stems will not thicken up, but new growth will be sturdier if you provide more light. You can stake the current stems to help them stand upright.

More problems with Canna lily

Back to the Canna lily 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.