Troubleshooting
Nasturtium problems — and how to fix them
Nasturtium (Tropaeolum majus) is generally forgiving once you match its basics, but a few issues come up again and again. Here is what each one looks like, why it happens, and the fix.
All leaves, no flowers
Too rich soil or too much nitrogen.
Cabbage caterpillars and aphids
Nasturtiums act as a trap crop — leave them and protect the brassicas behind.
Slow germination
Soak seed overnight; soil must be warm.
Trailing types take over
Pinch back tips to control.
Frost damage
Tender; cut back at first frost.
Prevent nasturtium problems before they start
Most nasturtium issues are care-mismatch, not bad luck. Dial in the basics:
Nasturtium problems — FAQ
Why is my nasturtium all leaves, no flowers?
Too rich soil or too much nitrogen.
Why is my nasturtium cabbage caterpillars and aphids?
Nasturtiums act as a trap crop — leave them and protect the brassicas behind.
Why is my nasturtium slow germination?
Soak seed overnight; soil must be warm.
Why is my nasturtium trailing types take over?
Pinch back tips to control.
Why is my nasturtium frost damage?
Tender; cut back at first frost.