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Hardy perennial
Boraginaceae
Perennials
Brunnera macrophylla 'Jack Frost'
Brunnera macrophylla
Siberian Bugloss 'Jack Frost': 40 cm high and 40 cm spread, partial shade to shade. Blue flowers in May-June. Zone 3; choose soil compatible with its moisture needs.
- Exposure
- Partial shade to shade
- Life cycle
- Hardy perennial
- Hardiness
- Zone 3
Discover the plant
Common nameBrunnera macrophylla 'Jack Frost'
FamilyBoraginaceae
GenusBrunnera
Speciesmacrophylla
CultivarJack Frost
TypeHardy perennial
Botanical nameBrunnera macrophylla
For a composition in partial to full shade, Siberian Bugloss ‘Jack Frost’ (Brunnera macrophylla ‘Jack Frost’) offers flowers in shades of blue. The foliage displays shades of green, which should be highlighted among different textures. The usual flowering period is May-June. The clump reaches approximately 40 cm in height and 40 cm in spread; use these dimensions to place the plant in partial shade beds and woodland gardens.
The success of Siberian Bugloss ‘Jack Frost’ begins with its location: partial to full shade, in suitable soil (kept moist, Clay). For Siberian Bugloss ‘Jack Frost’, regularly check the soil around the root ball: it must remain moist. Water at the base when the surface begins to dry and adjust watering according to rainfall; this exposure (partial to full shade) does not eliminate the need for water. Maintain a spacing of approximately 40 cm between plants; this helps preserve their shape and access for care. The indicated hardiness zone is 3, to be assessed according to your garden's conditions.
When planting Siberian Bugloss ‘Jack Frost’, maintain moisture around the base and remove damaged leaves to highlight new growth. The leaves of Siberian bugloss can suffer from scorching sun and root competition from large trees. For pairings, consider astilbes, tiarellas, and lungworts in varieties with similar needs. By composing around its volume of 40 cm by 40 cm, you will preserve the visibility of its bloom (May-June) and circulation between plants.
Planting guide
From planting to establishment.
Spacing / density
15.75 in
Best planting time
Spring after the thaw or early autumn, allowing time for the roots to settle before the severe cold.
Propagation
Division of clumps. Sowing does not guarantee the fidelity of a named cultivar.
Growing method
Brunnera macrophylla ‘Jack Frost’: In spring after the thaw or in early autumn, allowing the roots time to establish before the severe cold. For Brunnera macrophylla ‘Jack Frost’, regularly check the soil around the root ball: it should remain moist. Water at the base when the surface begins to dry and adjust the water supply according to rainfall; this exposure (part shade to shade) does not eliminate the need for water. Brunnera leaves can suffer from scorching sun and root competition from large trees.
Soil and care
The right care,at the right time.
Soil pH
Acid to neutral to alkaline; general indication of the botanical group
Care level
Regular maintenance
Watering
For Caucasian forget-me-not 'Jack Frost', regularly check the soil around the root ball: it must remain moist. Water at the base when the surface starts to dry, and adjust watering based on rainfall; this exposure (partial to full shade) does not eliminate the need for water.
Soil type
Kept moist, Clayey
Fertilization
Fertilizer for flowering
Moisture
Regular watering during growth
Seasonal care
Brunnera macrophylla 'Jack Frost': keep the soil around the base cool and remove damaged leaves to highlight new growth. During its flowering period (May-June), also look out for damaged stems and neighboring plants that might obscure the clump.
Container growing
A garden,within reach.
Recommended pot size
Stable and perforated container, significantly wider than the root ball; size to be adapted to the format sold and to adult development.
To try Caucasian Forget-Me-Not 'Jack Frost' in a container, choose a stable pot with drainage holes, suitable for the root ball and its future spread (40 cm). The substrate must remain moist; it will dry out more quickly than in open ground. Plan to protect the container in winter depending on your climate.
Bloom and dimensions
Its place,in your garden.
Mature height
16 inches (40.5 cm)
Width / spread
16 inches (40.5 cm)
Flower color
Blue
Foliage color
Green
Growth rate
Moderate
Growth habit
In rosette
Fragrance
Undocumented for this selection
Bloom period
May-June
Garden associations
In goodcompany.
Companion plants
Consider these associations for Brunnera macrophylla 'Jack Frost': astilbes, tiarella, lungworts. Choose varieties that tolerate part-shade to full shade and comparable moisture; allow enough space for each clump to reach its mature size.
Plants to avoid
Around Brunnera macrophylla 'Jack Frost', definitely avoid neighbors that would cover its leaves or strongly compete with its root ball. Compatibility in terms of light, water, and spread takes precedence over a list of so-called enemy plants.
Frequently asked questions
Your questions,answered.
Where to plant Brunnera macrophylla ‘Jack Frost’?
Expect partial shade to full shade and suitable soil (kept moist, clayey). Caucasian forget-me-not leaves can suffer from scorching sun and root competition from large trees.
Where should I plant Caucasian Forget-me-not 'Jack Frost'?
Expect a height and spread of around 40 cm at maturity. Allow approximately 40 cm between centers, to be adjusted according to the actual development of the clump. This size is suitable for use in semi-shaded borders and woodland gardens.
When does Brunnera macrophylla ‘Jack Frost’ bloom?
The indicated period is May-June. The flower color palette is blue. The exact date and duration depend on the climate, season, and plant establishment.
How to water and care for Siberian bugloss ‘Jack Frost’?
For Caucasian Forget-Me-Nots 'Jack Frost', regularly check the soil around the root ball: it should remain moist. Water at the base when the surface begins to dry, and adjust watering based on rainfall; this exposure (partial shade to shade) does not eliminate the need for water. Keep the area around the base moist and remove damaged leaves to highlight new growth.
Can Caucasian Forget-Me-Not 'Jack Frost' be grown in a pot?
To try Caucasian Forget-me-not 'Jack Frost' in a container, choose a stable pot with drainage holes, suitable for the root ball and its future size (40 cm). The substrate must remain moist; it will dry out faster than in the ground. Plan to protect the container in winter depending on your climate.
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