Brunnera macrophylla Jack of Diamonds - Siberian Bugloss
Brunnera macrophylla Jack of Diamonds - Siberian Bugloss
Brunnera macrophylla Jack of Diamonds
Siberian bugloss, Great Forget-me-not
Bought in early September 2025 and put straight into the ground. The plant had 3 large leaves before the winter. Everything wilted and died over the winter. At least, that’s what I thought until the end of February 2026: the young plant has spread out really well and goes beautifully with my pink and orange tulips (as advised in one of the tulip descriptions). Thank you for the plant pairing advice!
Natacha, 13/03/2026
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Description
Brunnera macrophylla 'Jack of Diamonds' is a giant version of the famous cultivar 'Jack Frost'. This Great Forget-me-not has particularly large leaves, measuring up to 25 cm (10in) long at maturity. It is a cultivar with exceptional ornamental qualities. Its beautiful, very bright leaves, are heart-shaped and a medium green shade covered with a silvery hue. They are finely veined with dark green. The plant is adorned in spring with truly blue flowers, as light as those of forget-me-nots, perfectly matching the silvery foliage. Without a doubt, it is a plant that attracts attention and creates a dramatic effect in a shade or semi-shade bed. A superb groundcover to be planted under trees and deciduous shrubs, in a bed, in a pot, or in a slightly neglected area of the garden.
Brunnera macrophylla, also known as Siberian Bugloss, is a perennial belonging to the Boraginaceae family, like forget-me-nots and borage. It grows in the forests of Eastern Europe and Northwestern Asia, on humus-rich soils. It is grown for its light blue flowers reminiscent of forget-me-nots and its groundcover habit, forming a thick carpet from spring to autumn. 'Jack of Diamonds' is a recent introduction from the United States. Its foliage is very oval, silver, veined with green, and marked with cream white. It forms a mound of overlapping leaves, giving a very circular impression to the plant. At maturity, this Brunnera reaches 40 cm (16in) in height and spreads over 75 cm (30in). In April and May, numerous small, very blue flowers appear in light panicles (in conical clusters). If care is taken to remove this first bloom when it fades, there may be a second bloom in autumn. The clumps spread slowly through their rhizomatous roots, but also self-seed quite easily, although the new plants are not always true to the mother plant. The deciduous vegetation dries up in winter.
Very hardy, to -20°C (1°F), the Great forget-me-not 'Jack of Diamonds' is a charming and robust groundcover, to be planted under deciduous trees and shrubs, on the edge of a woodland, or even on the banks of a pond. Its foliage illuminates dark areas and is very decorative in pots and shaded flower beds. It is also a good border plant that works wonders in wild gardens or fairly informal perennial beds. Plant it with Lamiums, blue Hostas, Purple Heucheras, Bleeding Hearts, Polychrome Spurge, or Columbines. It pairs well with spring-flowering bulbs, especially tulips.
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Brunnera macrophylla Jack of Diamonds - Siberian Bugloss in pictures
Flowering
Foliage
Plant habit
Botanical data
Brunnera
macrophylla
Jack of Diamonds
Boraginaceae
Siberian bugloss, Great Forget-me-not
Cultivar or hybrid
Planting and care
Plant Brunnera macrophylla Jack of Diamonds in moist, humus-rich and well-drained soil. Place it in dappled sunlight or partial shade. Shelter it from excessive sunlight and protect it from strong winds. Brunnera is resistant to most diseases and parasites. This perennial needs time to grow and become spectacular. New foliage appears in March-April, just before flowering, and then the leaves grow larger.
This plant offers 2 to 3 months of flowers, and a small second flowering in autumn if it is watered during the hottest months. After spring flowering, remove faded flower stems so that the foliage remains dense. If you want the plant to self-seed, allow a few flowers to produce seeds. In autumn, leave the blackened and dried foliage in place. It will provide the plant with protection against winter cold.
Planting period
Intended location
Care
Planting & care advice
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Hardiness is the lowest winter temperature a plant can endure without suffering serious damage or even dying. However, hardiness is affected by location (a sheltered area, such as a patio), protection (winter cover) and soil type (hardiness is improved by well-drained soil).
In temperate climates, pruning of spring-flowering shrubs (forsythia, spireas, etc.) should be done just after flowering.
Pruning of summer-flowering shrubs (Indian Lilac, Perovskia, etc.) can be done in winter or spring.
In cold regions as well as with frost-sensitive plants, avoid pruning too early when severe frosts may still occur.
The harvesting period indicated on our website applies to countries and regions in USDA zone 8 (France, England, Ireland, the Netherlands).
In colder areas (Scandinavia, Poland, Austria...) fruit and vegetable harvests are likely to be delayed by 3-4 weeks.
In warmer areas (Italy, Spain, Greece, etc.), harvesting will probably take place earlier, depending on weather conditions.
The sowing periods indicated on our website apply to countries and regions within USDA Zone 8 (France, UK, Ireland, Netherlands).
In colder areas (Scandinavia, Poland, Austria...), delay any outdoor sowing by 3-4 weeks, or sow under glass.
In warmer climes (Italy, Spain, Greece, etc.), bring outdoor sowing forward by a few weeks.
The planting period indicated on our website applies to regions in USDA Zone 9a (East Coast and Midlands: Dublin, Wexford, Waterford, Kilkenny, Portlaoise). It will vary depending on where you live:
- On the west coast and in the north-west (Galway, Limerick, Sligo, Donegal, Westport), delay planting by 1 to 2 weeks in spring and bring it forward by 1 to 2 weeks in autumn compared to the dates given, preferably choosing periods without strong winds.
- In the inland hills and plateaus (Wicklow Mountains, Macgillycuddy’s Reeks, Connemara, Killarney), it is best to plant in spring (April–May) or autumn (September–October), avoiding periods of waterlogged soil in winter and strong winds, which pose the main risk to newly planted trees in these areas.
The flowering period indicated on our website applies to regions in USDA Zone 9a, such as the East Coast and Midlands, including Dublin, Wexford, Waterford, Kilkenny and Portlaoise.
This will vary depending on where you live:
- On the west coast and in the northwest (Galway, Limerick, Sligo, Donegal and Westport), it will be delayed by one to two weeks compared to the given dates, due to stronger Atlantic winds and less spring sunshine.
- In the inland hills and plateaus (the Wicklow Mountains, the Macgillycuddy's Reeks, Connemara and Killarney), flowering will be delayed by two to three weeks. Flowering mainly occurs between May and July, with the limiting factors being less frost and more of the excessive humidity, strong winds and lack of sunshine that are characteristic of these areas.
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