Overwintering guide
How to overwinter wave petunia
Winter watering
Cut watering right back — wave petunia uses far less while growth slows, and cold, wet compost is the usual cause of winter root rot. Stop feeding until spring.
The mistake that kills wave petunia in winter
Watering on the same schedule as summer. In winter that keeps the roots sodden while the plant is barely drinking, and wave petunia rots from the base.
More wave petunia care
Overwintering wave petunia — FAQ
Does wave petunia need to come indoors for winter?
Wave Petunia is hardy to roughly USDA zone 10 — winter lows around -1°C. That means it will not survive frost and needs to come inside. Wave Petunia is frost-tender, so overwintering means bringing it inside and letting it rest rather than pushing it to grow. Move it indoors well before the first frost, give it the brightest spot you have (light levels indoors drop sharply in winter), and keep it away from both cold window glass and hot radiators — the swing between the two does more damage than the cold itself.
When should I move wave petunia for winter?
Bring indoors when nights start dropping below about 10°C, ahead of the first frost.
How often should I water wave petunia in winter?
Cut watering right back — wave petunia uses far less while growth slows, and cold, wet compost is the usual cause of winter root rot. Stop feeding until spring.
What kills wave petunia over winter?
Watering on the same schedule as summer. In winter that keeps the roots sodden while the plant is barely drinking, and wave petunia rots from the base.