Holes in Jack Frost brunnera. ... Solves problems by covering weed producing ground beneath large shrubs that have lost their skirt foliage. With its ease of production, desirable attributes, and garden performance brunnera âJack Frostâ was named the 2012 Perennial Plant of the [â¦] I heard you can root these in water and was wondering if this is accurate. I was wondering if it multiplies well. âJack Frostâ leaves are a distinctive silvery white with green primary and secondary veins and a thin green rim around the leaf edges. The question. Brunnera is an ideal plant to choose if youâre looking for something a little more unusual for the spring garden. Mark unread; Skip to new; Mark unread Print Skip to new. I have this Brunnera "Jack Frost" and was wondering how to propagate it. I've seen pictures and it looks like it becomes a large plant. The black areas are very thin and crumbly. Clump-forming, this deciduous perennial remains attractive during the entire growing season. had a problem with brunneras being nibbled from either above or below - have 2 large patches - one is Jack Frost and the other is Looking Glass (?). Genus Brunnera are rhizomatous herbaceous perennials with large, ovate or heart-shaped basal leaves and sprays of small bright blue flowers in spring Details 'Jack Frost' is a perennial grown for its large, heart-shaped silver leaves edged and veined with green, and sprays of small blue flowers in spring Q: My 'Jack Frost' brunnera leaves have a strange pattern on them, and after looking around on the Internet, I wonder if the problem is from foliar nematodes. The only info I find tells me to divide in winter.I live in Rochester,NY and the ground is frozen here in ⦠Although its clouds of bright blue flowers add cool and striking color to the landscape in spring, award-winner Brunnera Macrophilla 'Jack Frost' is mostly valued for its beautiful foliage which creates a lush carpet of large, heart-shaped silver leaves edged and veined with green. Throughout April and May, Brunnera âJack Frostâ is covered with lots of small, bright blue flowers which look rather like forget-me-nots. 1alh1 Sidney, OH(Zone 6a) Jun 02, 2012. I have 3 very large Jack Frost Brunnera and I would like to divide them. My beautiful Jack Frost brunneras are being attacked by something chewing perfectly round holes in the upper leaves. Never (touch wood!) Brunnera macrophylla (common form) has large, dull-green heart-shaped leaves, topped with clusters of tiny bright blue flowers in spring. More. Watch Reply. Lovely plants - look like forget me nots right now but a lovely patch of variegated foliage for the rest of the year. Now it has black spots and black edging on the leaves. Thanks for any info you can provide. Jack Frost Brunnera Brunnera macrophylla 'Jack Frost' Plant Patent #13,859. U.S. Plant Patent PP13,859 issued June 3, 2003. It is a sport of non-patented Brunnera marcrophylla âLangtreesâ. I'm having problems with my Brunnera 'Jack Frost' - the leaves become covered with brown spots in July and August when the weather is hot and humid. Particularly lovely in speckled shade beneath white lattice arbors and structures. Height to 1.5ft (45cm), spread to 2ft (60cm) or more. Sku #3538. Brunnera macrophylla 'Jack Frost' has attractive heart-shaped silver leaves, veined with green and a metallic sheen. We have had a lot of rain in NYC this summer and it seems to have affected my Brunnera 'Jack Frost' which was looking very good at the beginning of the summer. 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