Pocket BotanistCheck these first
- Check how many hours of direct sunlight the plant receives.
- Inspect your fertilizer label for high nitrogen levels.
- Review your pruning schedule to ensure you are not cutting off potential buds.
Likely causes
Too much nitrogen
Most likelyHow to tell: The plant has lush, dark green foliage but zero flower buds.
What to do: Stop using high nitrogen fertilizers immediately. Switch to a fertilizer with a higher phosphorus content, like a 0 to 10 to 10 blend, to encourage blooming.
Incorrect pruning
Most likelyHow to tell: You are cutting back the long, whippy growth during the winter or early spring.
What to do: Prune your wisteria twice a year. Cut back the long green shoots to 5 or 6 buds in mid summer, and then trim those same shoots back to 2 or 3 buds in late winter.
Insufficient sunlight
PossibleHow to tell: The vine is growing in a shaded area and looks thin or stretched out.
What to do: Move the plant or prune back surrounding trees to ensure it gets at least 6 hours of direct sun daily. Wisteria needs full sun to set flower buds properly.
Find out what's wrong with your japanese wisteria
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
If your wisteria is young, it may simply need 3 to 5 years to reach maturity before it blooms. If it is an older plant that has never bloomed, you should adjust your pruning habits.
Stopping it coming back
Stick to a consistent twice yearly pruning schedule and avoid over fertilizing with nitrogen.
Japanese wisteria: not flowering? Check yours with a photo
Every plant is a little different. Take a photo of your japanese wisteria 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
Get the app · Or check it from a photo now, free
Questions people ask
- Will my wisteria bloom if it is in the shade?
- It is very unlikely. Japanese wisteria requires full sun to produce flowers.
- How long does it take for a new wisteria to flower?
- It can take anywhere from 3 to 7 years depending on whether the plant was grown from seed or a cutting.
More problems with Japanese wisteria
- Why are there spots on my Japanese wisteria leaves?
- What are these pests on my Japanese wisteria?
- Why are my Japanese wisteria leaves turning yellow?
- Why are my Japanese wisteria leaf tips turning brown?
- Why is my Japanese wisteria drooping?
- Why is my Japanese wisteria dropping leaves?
- Why is my Japanese wisteria suffering from root rot?
- Why is my Japanese wisteria growing so leggy?
Back to the Japanese wisteria 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.