Troubleshooting
Painted Lady sweet pea problems — and how to fix them
Painted Lady sweet pea (Lathyrus odoratus 'Painted Lady') 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.
Slugs and snails on seedlings
Young sweet pea seedlings are highly palatable to slugs. Protect newly transplanted or germinating seedlings with iron phosphate pellets, copper tape, or gritty mulch. Check under pots and debris in the evenings during damp spring conditions.
Premature flowering cessation in heat
Painted Lady, like most heritage sweet peas, stops blooming when temperatures exceed 21–23°C, setting seed rapidly. Cut flowers daily (never allow pods to set), mulch roots, and consider a late-winter succession sowing to extend the flowering season into autumn in cool climates.
Fusarium wilt (foot rot)
Lathyrus odoratus is susceptible to Fusarium oxysporum f.sp. pisi causing sudden wilting and root browning. Avoid growing sweet peas in the same ground two years running; practise a minimum 4-year rotation. Remove and destroy affected plants; do not compost.
Prevent painted lady sweet pea problems before they start
Most painted lady sweet pea issues are care-mismatch, not bad luck. Dial in the basics:
Painted Lady sweet pea problems — FAQ
Why is my painted lady sweet pea slugs and snails on seedlings?
Young sweet pea seedlings are highly palatable to slugs. Protect newly transplanted or germinating seedlings with iron phosphate pellets, copper tape, or gritty mulch. Check under pots and debris in the evenings during damp spring conditions.
Why is my painted lady sweet pea premature flowering cessation in heat?
Painted Lady, like most heritage sweet peas, stops blooming when temperatures exceed 21–23°C, setting seed rapidly. Cut flowers daily (never allow pods to set), mulch roots, and consider a late-winter succession sowing to extend the flowering season into autumn in cool climates.
Why is my painted lady sweet pea fusarium wilt (foot rot)?
Lathyrus odoratus is susceptible to Fusarium oxysporum f.sp. pisi causing sudden wilting and root browning. Avoid growing sweet peas in the same ground two years running; practise a minimum 4-year rotation. Remove and destroy affected plants; do not compost.