Vegetative Variety

Brunnera macrophylla Frostbite

Download Plant Culture

Data is gathered from our West Grove, Pa., trials (Zone 6a). Southern growers: expect 1-2 weeks earlier finishing. Northern growers: 1 week slower. Consider summertime scheduling accurate. Dates based on a standard 72 liner size.

Notes/Pitfall Management
Requires overwintering for flowering. Does not require flowers for a very marketable container.
Week color desired
TC stick week
Liner transplant week
Early Spring
(1 ppp)
Can fill out a 2G given more time.
Week color desired
TC stick week
Liner transplant week
(1 ppp)
Provide partial shade for early summer finishing. Can fill out a 2G given more time.
Propagation Guide
Media EC/pH: EC 0.75-0.80 mmhos/pH 5.8-6.2
Soil Temperature: 68-72°F (21-22°C)
Rooting Hormone: None
Mist: Low mist or tenting
Fertilization: Balanced fertilizer 75-100 ppm
Pinching: None
Transplanting: 7-8 weeks
Comments: This is a tissue culture raised item. Please see our detailed tissue culture propagation guide at This item is generally a Summer propagated item. Excessive heat can cause losses.
Finishing Guide
Media pH: 5.8-6.2
Temperature: Nights: 50 to 55°F (10 to 13°C) Days: 60 to 65°F (16 to 18°C)
Light Level (fc): 1,500 to 2,500
Vernalization: Yes, required for flowering; however, plants sell as foliage.
Daylength: Day length neutral
Watering: Allow media to dry slightly between watering.
Fertilization: Use a balanced fertilizer at a rate of 100 to 125 ppm.
Pinch After Transplant: None
Plant Growth Regulators: PGRs generally not needed
Pests and Fungal Diseases: Pythium and rhizoctonia can result from overwatering.