Evaluating Perennials for Chicagoland Gardens

Perennials in Focus is a plant evaluation program that examines new and underused plants for Chicagoland, the third largest metropolitan area in the country. A group of horticultural experts trials and evaluates plants at numerous locations across the region. Results help consumers, public gardens, growers, landscape designers, breeders, and other industry professionals make informed plant choices.

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Foliage First: Shade Perennials With Patterns That Rival Pulmonaria

When the sun retreats behind fences, gum trees, or the wide eaves of an Australian home, flowers often take a back seat. The real drama in a shaded bed comes from leaves, not petals. A single well-chosen clump of patterned foliage can anchor a border for months, even years, with minimal fuss and very little water once established. This shift opens up a quieter, more enduring kind of garden design.

Lungwort (Pulmonaria saccharata) has long been the benchmark for silver-spotted, shade-loving perennials, with lance-shaped leaves that brighten dim corners from late winter through summer. Yet the world of variegated and textured perennials extends well beyond this classic. For gardeners in Melbourne, Sydney, Adelaide, Brisbane, or Hobart, there is a rich palette of shade-tolerant plants offering comparable visual interest, with the added benefit of suiting local conditions and Australia's biosecurity requirements.

The plants that follow represent seven reliable groups for shaded borders. They have been chosen for distinctive leaf patterns, adaptability to Australian climates, and availability through local nurseries. Whether you are refreshing a courtyard in Brisbane or restoring a woodland planting in the Adelaide Hills, these perennials reward thoughtful placement with years of quiet, low-maintenance display.

Heuchera and heucherella: silver veins and amber tones

Heucheras, often called coral bells, have undergone a quiet revolution. Leaves now come in caramel, plum, lime, and near-black, with many showing a silver veined or marbled overlay. 'Silver Scrolls' and 'Pewter Moon' bring cool metallic tones to shaded beds, while 'Caramel' and 'Southern Comfort' glow warmly in the soft light of a verandah garden in Perth or Adelaide.

Heucherellas are hybrids between Heuchera and Tiarella, combining the best traits of both parents. Their deeply lobed leaves often carry a dark central blotch and contrasting veining, creating a stained-glass effect under filtered light. They cope well with the humidity of a Sydney summer as long as soil drainage is sharp. In cooler parts of Tasmania, they remain evergreen through winter, providing structure when many other perennials have died back.

Brunnera macrophylla: heart-shaped silver canvases

Few perennials match Brunnera for sheer leaf impact in shade. The species form has broad, heart-shaped green leaves, but selections like 'Jack Frost' and 'Looking Glass' are almost entirely silver, with only delicate green veining remaining. Planted en masse beneath deciduous trees, they create a luminous carpet that brightens the gloomiest corner of a courtyard.

In Australian gardens, Brunnera performs best in the southern states where winters are cool and summers are not excessively hot. Gardeners in Melbourne and the Adelaide Hills will find it particularly easy, provided the soil does not dry out completely. Mulch with leaf mould or composted bark to mimic the woodland conditions of its native habitat. The spring bonus is a spray of small blue flowers that resemble forget-me-nots, hovering above the foliage like a soft haze. For those planning a vase-worthy bed, guidance on cut flowers that overwinter in cooler regions offers useful starting points.

Lamium and ajuga: groundcovers with metallic sheen

When the goal is to carpet shaded ground with shimmering texture, Lamium maculatum and Ajuga reptans are hard to beat. Lamium offers scalloped leaves with silver centres and narrow green margins, while cultivars like 'White Nancy' and 'Pink Pewter' read as almost luminous in deep shade. The plant spreads by trailing stems that root as they go, filling gaps between larger perennials without becoming invasive in most Australian settings.

Ajuga, or bugleweed, brings a different mood. Its glossy rosettes can be deep bronze, near-black, or variegated with cream and pink. 'Burgundy Glow' is especially striking, its leaves shifting colour with the seasons. Both tolerate the dry shade found beneath established trees, a common challenge in older Sydney and Brisbane suburbs where old camellias and magnolias create dense canopies. They also handle occasional foot traffic from kids and pets, making them useful along shaded pathways near the back door.

Tiarella and foamflower: lace and burgundy

Tiarella, the foamflower, offers intricate leaf shapes that resemble maple or sycamore silhouettes, often with a dark central blotch and contrasting veining. In winter, the foliage of many cultivars turns bronze or burgundy, extending the season of interest well beyond the delicate white flower spikes of spring. 'Sugar and Spice' and 'Iron Butterfly' are reliable performers that bring a woodsy delicacy to shaded plantings.

Foamflowers pair beautifully with broader-leaved companions such as hostas or Brunnera, creating a tapestry of contrasting textures. In the cool, moist microclimates of a Hobart garden or a shaded courtyard in Canberra, they thrive with minimal intervention. They prefer a humus-rich soil and appreciate a yearly top-dress of compost. Once established, they are remarkably drought tolerant, an asset in regions where water restrictions are tightening. For gardeners wanting to expand their repertoire into productive plants, exploring edible perennial choices can complement a shaded ornamental border with culinary interest.

Polygonatum and Solomon's seal: architectural simplicity

For vertical interest in shade, Polygonatum, commonly known as Solomon's seal, is hard to match. Its arching stems carry pairs of bell-shaped flowers in late spring, but the real show is the clean, geometric arrangement of oval leaves along graceful stalks. The variegated form, Polygonatum x hybridum 'Variegatum', adds creamy white leaf margins that brighten shady corners from Canberra to Katoomba.

Solomon's seal grows from rhizomes that slowly expand into generous clumps. It appreciates the same woodland conditions that suit Brunnera and Tiarella, and it pairs well with native groundcovers such as Plectranthus species, which offer a local alternative for shaded Australian gardens. All parts of Polygonatum are toxic if ingested, so site it thoughtfully where toddlers play. The plant is otherwise remarkably trouble-free, tolerating frost and dry periods once settled in.

Hostas with variegation: beyond the ordinary

Hostas are the undisputed champions of shade foliage in temperate gardens, and modern breeding has produced a dazzling range of variegated forms. 'Patriot' and 'Minuteman' carry crisp white margins, while 'June' offers a chartreuse centre with blue-green edges. Their bold, ribbed leaves contrast beautifully with the finer textures of ferns and Tiarella.

The main challenge in Australia is slug and snail damage, particularly in the humid coastal gardens of Brisbane and Sydney. Copper rings, pet-safe baits, and encouraging natural predators such as blue-tongue lizards can help. In drier inland areas, hostas need regular watering and deep mulch to prevent leaf scorch. A well-grown hosta remains a showpiece that anchors a shade border for decades.

Designing with patterned foliage in Australian shade

Creating a successful shade border is about layering textures, colours, and leaf sizes. Start with the largest foliage plants at the back, such as variegated Solomon's seal or large hostas. Mid-border, place Brunnera and Heuchera in groups of three or five for visual rhythm. At the front, use Lamium, Ajuga, or Tiarella to soften edges and tie the composition together.

Australian gardeners should also consider local alternatives. Plectranthus 'Mona Lavender' offers patterned leaves and lavender flowers for shaded patios, while native violets and hardenbergias can complement a more indigenous planting. Check state biosecurity regulations before ordering plants from interstate or overseas, as the Biosecurity Act 2015 restricts which species are permitted. Sourcing from local nurseries or visiting a weekend market run by the Australian Plants Society helps ensure plants are disease-free and acclimatised. When designing the adjacent entertaining area, choosing flooring for high traffic helps create a seamless transition between house and garden.

Get involved with collaborative plant evaluation programs by submitting observations, hosting trial plants in your garden, or reading published findings. Your input helps build a clearer picture of what thrives in real-world conditions across the country. Foliage perennials like these reward patient observation, offering seasons of structure long after the last flower has faded.

In the Garden

Evaluator gardens are located across the Chicagoland area, representing a range of growing conditions. Visit our retail and wholesale partners to find trialled perennials for your own garden.

Retail & Wholesale: Hinsdale Nurseries (Willowbrook, IL), Mariani Nurseries (Kenosha, WI & Garden Prairie, IL), Northwind Perennials (Burlington, WI), The Growing Place (Aurora, IL).

Wholesale Only: Hinsdale Nurseries (Plano, IL), Intrinsic Perennial Gardens (Hebron, IL).

Our Evaluation Program

The 2017–2020 evaluation cycle included Agastache 'Blue Boa', Allium senescens 'Blue Eddy', Amsonia ciliata var. filifolia 'Georgia Pancake', Astilbe 'Chocolate Shogun', Boltonia astroides 'James Crocket', Brunnera 'Alexander's Great', and Geranium cinereum 'Jolly Jewel Purple'. Completed evaluations include Amsonia 'Blue Ice' (2004–07).

On April 10, 2020, the program published snapshot profiles for Vernonia lettermanii 'Iron Butterfly', Stokesia laevis 'Elf', Stachys officinalis 'Pink Cotton Candy', Lobelia 'Monet Moment', Helleborus 'Winter Thrillers', Geum 'Mai Tai', Geranium soboliferum 'Butterfly Kisses', Gentiana x intermedia 'True Blue', Eurybia divaricata, Asparagus 'Purple Passion', and Agastache 'Bolero'.

Browse the full collection of snapshots organized alphabetically — from A–D, E–H, I–Q, and R–Z — to find detailed performance data on perennials trialled across Chicagoland.

Close-up of drooping orange and yellow spurred flowers with slender petals
Cluster of light purple daisy-like flowers with yellow centers
Tall spike of orange-yellow tubular foxglove flowers against blurred green
Cluster of small tubular orange-red flowers among green leaves