Overwintering guide
How to overwinter thick-leaf primulina
Winter watering
Cut watering right back — thick-leaf primulina 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 thick-leaf primulina in winter
Watering on the same schedule as summer. In winter that keeps the roots sodden while the plant is barely drinking, and thick-leaf primulina rots from the base.
More thick-leaf primulina care
Overwintering thick-leaf primulina — FAQ
Does thick-leaf primulina need to come indoors for winter?
Thick-leaf Primulina is hardy to roughly USDA zone 10 — winter lows around -1°C. That means it will not survive frost and needs to come inside. Thick-leaf Primulina 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 thick-leaf primulina for winter?
Bring indoors when nights start dropping below about 10°C, ahead of the first frost.
How often should I water thick-leaf primulina in winter?
Cut watering right back — thick-leaf primulina uses far less while growth slows, and cold, wet compost is the usual cause of winter root rot. Stop feeding until spring.
What kills thick-leaf primulina over winter?
Watering on the same schedule as summer. In winter that keeps the roots sodden while the plant is barely drinking, and thick-leaf primulina rots from the base.