Pocket Botanist
Check these first
- Observe how many hours of direct sun the plant gets daily.
- Check the stems for signs of stretching.
- Determine if the plant has been pruned this season.
Likely causes
Low light
Most likelyHow to tell: Stems are long and thin with large gaps between the leaves.
What to do: Relocate the plant to a brighter area with full sun. If indoors, place it directly in a south facing window.
Lack of pruning
Most likelyHow to tell: The plant has grown very tall and sparse after a long period of growth.
What to do: Use clean garden shears to cut the stems back by 3 to 4 inches. This forces the plant to grow bushier from the base.
High temperatures
PossibleHow to tell: The plant stretches out and wilts during the hottest part of the day.
What to do: Provide some afternoon shade during heat waves. Ensure you are watering every 2 to 4 days to keep the roots cool.
Find out what's wrong with your sweet alyssum
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 the plant to get a bit loose as the season ends. Worry if it happens early in the spring when the plant should be compact.
Stopping it coming back
Pinch back the tips of young stems early in the season to encourage a dense, mounded shape.
Sweet Alyssum: leggy growth? Check yours with a photo
Every plant is a little different. Take a photo of your sweet alyssum 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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Or go to pocketbotanist.app/get on your phone
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Questions people ask
- Can I fix a leggy plant by just moving it?
- Moving it helps, but you should also prune the long stems to encourage new, compact growth.
- Is it too late to prune my alyssum?
- It is never too late during the growing season. A hard prune will rejuvenate the plant.
More problems with Sweet Alyssum
Back to the Sweet Alyssum 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.