Pocket BotanistCheck these first
- Measure how many hours of direct sun the plant gets.
- Check if the plant has been fertilized recently.
- Ensure the plant is mature enough to bloom.
Likely causes
Insufficient light
Most likelyHow to tell: The plant looks leggy or stretched, and the stems are thin. It is not getting the full sun it needs to produce flowers.
What to do: Move the plant to a location where it receives at least 6 to 8 hours of direct sunlight daily. If you cannot move it, consider adding a grow light above the container.
Low nutrient levels
PossibleHow to tell: The plant is green and healthy but never produces any flower spikes. It lacks the energy reserves required for blooming.
What to do: Apply an aquatic fertilizer designed for flowering pond plants. Use it once every 4 weeks during the peak of summer to encourage bud formation.
Find out what's wrong with your water smartweed
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
Worry if the plant is well established and getting plenty of sun but still refuses to bloom after a full season. It is normal for young plants to skip flowering in their first year.
Stopping it coming back
Provide consistent full sun and regular feeding during the summer months to support flower production.
Water smartweed: not flowering? Check yours with a photo
Every plant is a little different. Take a photo of your water smartweed 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.
Scan with your phone's camera to get the app
Or go to pocketbotanist.app/get on your phone
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Questions people ask
- Does water smartweed always flower?
- It needs specific conditions to bloom, primarily lots of sun. If it is in partial shade, it may grow leaves but skip the flowers.
- What time of year should I expect flowers?
- You will typically see flowers appearing in the mid to late summer. Be patient if it is still early in the season.
More problems with water smartweed
Back to the water smartweed 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.