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.
Beyond Aronia: Berried perennials for Australian winter wildlife
Aronia melanocarpa, the glossy black chokeberry, has earned a loyal following in cooler North American gardens for its clusters of late-summer fruit that cling to bare branches well into the snowy months. Australian gardeners looking for similar performance face a different climatic reality, where winters range from frosty alpine conditions in Tasmania to the mild, dry chill of Perth. The good news is that a wide palette of berried perennials, including unexpected local natives, can keep honeyeaters, silvereyes, and ringtail possums foraging through the leanest months of the year. Learn more about Can You Reuse A Mcafee Retail Card Code After A Failed Activation 9d25.
Across southern Australia, the winter berry gap often determines whether resident birds survive until the first nectar-rich banksias bloom in late winter. Strategic plantings of fruit-bearing perennials can transform a quiet garden into a reliable food source, particularly in suburban corridors where bushland remnants are fragmented. Pairing berried species with dense understorey plants also offers shelter, mimicking the layered structure that small native mammals and birds instinctively seek.
Why winter berries matter down under
In temperate regions of Australia, June through August is a notoriously lean period for natural fruit. Eucalypts may still carry gum nuts, but the soft berries that songbirds prefer are largely gone by late autumn. Filling that gap with cultivated perennials gives species like the eastern spinebill, the new holland honeyeater, and the silvereye a reliable pantry when temperatures dip. The effect is felt strongly in inner suburbs of Melbourne and Hobart, where small gardens collectively form critical refuges for wildlife displaced by urban densification.
Berry colour matters too. Dark blue and black fruit tends to attract smaller birds, while brighter red and orange berries pull in larger species such as currawongs and crimson rosellas along the ranges. For gardeners concerned with biosecurity, it's worth noting that the federal Biosecurity Act 2015 restricts the import of many fruiting plants from overseas, which is why locally grown, traceable stock from suppliers like Diggers Club or regional native-plant nurseries is the safest route.
Australian natives that outshine the imports
Several native perennials produce abundant, persistent berries without the chill-hour requirements of Aronia. Gaultheria appressa, the waxberry, forms a dense ground-hugging mat in cool-climate gardens from the Adelaide Hills to Tasmania, with white to pink fruits that remain well into spring. In warmer coastal sites, Billardiera longiflora, the climbing purple apple berry, offers purple fruits with a subtle aniseed note, much loved by satin bowerbirds in Sydney's leafy eastern suburbs.
Dianella species, often called flax lilies, deserve a place in every wildlife-focused planting. Their metallic blue berries are borne on arching stems and are stripped by honeyeaters within days of ripening. For arid-zone gardeners, the understorey shrub Eremophila maculata produces small fleshy fruits that hold through dry winters, providing sustenance for birds in inland regions where frost is rare but resources are scarce. Each of these natives thrives without supplementary irrigation once established, an important consideration in towns where permanent water restrictions still shape planting choices.
Cool-climate exotics worth trialling
In frost-prone corners of Australia, think Orange in New South Wales, Ballarat in Victoria, or the elevated parts of the Southern Tablelands, several northern-hemisphere perennials adapt well. Aronia melanocarpa itself performs reliably in these areas, provided summer moisture is consistent. Callicarpa bodinieri var. giraldii 'Profusion' offers luminous lilac berries clustered tightly along bare stems, withstanding frosts down to around minus ten degrees.
Another option is Clerodendrum trichotomum, the harlequin glory bower, whose turquoise berries cradled in maroon calyces are as ornamental as they are nourishing for birds. It tolerates Melbourne's heavy clay once established and is rarely troubled by pests. For gardeners keen to extend the visual and ecological interest of a planting, pairing these exotics with reliable reblooming perennials, including the well-documented case of trialing the reblooming habit of hemerocallis stella de oro in partial shade tips, keeps the border active across multiple seasons.
Designing for wildlife at the suburban edge
A successful wildlife planting layers structure and season. Begin with a small tree or tall shrub such as a local Hakea or a grafted weeping cherry, then descend through mid-height berried perennials to a ground layer of Gaultheria or creeping mint. In coastal suburbs where possums browse heavily, protecting juvenile plants with tree guards for the first two seasons is essential. Mulching with coarse, locally sourced eucalyptus leaf litter suppresses weeds and slowly acidifies the soil, suiting the blueberry relatives in particular.
Grouping at least three of the same species together increases the chance that birds will discover the fruit and remember the location. Bunches of five or seven Gaultheria appressa, for example, are far more effective than scattered single plants. This clumping approach also suits the smaller backyards common across Brisbane's western suburbs and Adelaide's foothills, where every square metre must earn its keep.
Sourcing, caring, and keeping records
Bare-root season is the most affordable way to acquire many of these perennials, with most Australian suppliers shipping from June through August. Buying from local growers reduces freight, supports the regional economy, and ensures the plants are already adapted to local conditions. A quick note on online transactions: keep records of every order, particularly when a retail card activation hiccup threatens to derail an otherwise smooth planting plan.
Once established, most of these species need little more than an annual tidy and a light application of composted manure in early spring. Avoid high-phosphorus fertilisers on native species, as they can damage the sensitive mycorrhizal associations these plants rely on. Light tip-pruning after fruiting encourages bushier growth and, in the case of Billardiera, a more generous crop the following year.
Documenting performance across seasons
A simple field notebook, a spreadsheet, or a dedicated garden app can transform a casual planting into a useful dataset. Recording first-flower date, peak berry colour, and the species of bird observed feeding creates a personal archive that gains value year on year. The format developed by the team at Perennials in Focus offers a useful template, and their write-up on how to extend the bloom period of your perennial border insights applies equally well to extending the berry window.
Photographing the same plant at fortnightly intervals builds a visual record that helps identify microclimates within the garden. Over time, this evidence-based approach makes it easier to recommend reliable species to neighbours, community groups, and local Landcare networks, spreading the ecological benefits well beyond a single property.
If you grow any of these plants in your own patch, consider submitting your observations to a regional trial program. Whether you're trialling Aronia in a Tassie orchard or watching wattlebirds strip your Dianella in inner Sydney, your data helps build a clearer picture of what truly performs across the diverse climates of Australia.
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.