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.
Perennials With Distinctive Seed Pods for Dried Flower Arrangements
Dried flower arrangements have evolved well beyond the humble lavender bunch tied with raffia. Today's designers reach for structural elements that hold their shape long after the fresh-cut season has passed, and seed pods have become one of the most sought-after materials in contemporary floral craft. From translucent discs to woody spheres and papery husks, these botanical remnants bring architectural interest that fresh blooms simply cannot replicate.
Australian gardeners are well placed to grow an extraordinary range of perennials that produce eye-catching pods. The continent spans cool temperate zones in Tasmania and Victoria, Mediterranean climates around Adelaide and Perth, and subtropical humidity along the eastern seaboard. With thoughtful plant selection, growers from Hobart to Brisbane can cultivate seed-bearing perennials that supply arrangements throughout the year, supporting more sustainable floristry practices.
The following selections highlight perennials known for pods that dry beautifully, retain their form on the stem, and bring unexpected texture to wreaths, vase arrangements, and wall hangings. Many double as attractive border specimens during the growing season, rewarding gardeners with months of ornamental value before their seed structures take centre stage.
Baptisia Australis and Its Charcoal Pods
False indigo, known botanically as Baptisia australis, produces inflated charcoal-coloured seed pods that rattle softly when dry. The plant forms a shrub-like perennial reaching 90 to 120 centimetres tall, with lupin-like blue flowers in late spring. Once the blooms fade, the developing pods swell through summer and ripen to a deep, almost black tone by autumn, providing material that lasts for years when dried.
For Australian conditions, baptisia thrives in cooler districts such as Melbourne, the Adelaide Hills, and southern New South Wales where winters are cool enough to satisfy dormancy requirements. Plants prefer full sun and well-drained soil, and once established they tolerate extended dry periods. The pods are best harvested just as they begin to dry on the stem, then conditioned in a warm, airy shed away from direct sunlight. In floral design, baptisia pods contribute linear form and a sophisticated dark hue that pairs beautifully with silvered eucalyptus foliage or the papery discs of honesty.
Lunaria and Physalis for Translucent Drama
Honesty (Lunaria annua) is technically a biennial, though it self-seeds so reliably that many gardeners treat it as a permanent perennial feature. Its flattened, papery seed pods, often called money plants, consist of translucent membranes that catch light beautifully. Strip away the outer husks and you are left with shimmering silver discs that anchor many a winter wreath.
Chinese lanterns (Physalis alkekengi) produce vivid orange-red calyces resembling small paper lanterns encasing the fruit inside. The colour holds well when dried, though the husks become brittle and benefit from a light spray of craft sealant. In parts of Australia, particularly along waterways in Victoria and New South Wales, this species shows invasive tendencies, so gardeners should monitor spread carefully. Biosecurity rules also apply when sharing plant material across state borders. Together, these two species offer exceptional versatility, working equally well in rustic farmhouse arrangements or contemporary minimal compositions.
Hellebores and Their Quiet Carpel Beauty
Hellebores offer an underrated option for the dried arranger. As the spent flowers of Helleborus orientalis drop, they reveal clusters of green carpels that gradually harden into elegant seed cases. These are subtle rather than showy, but their sculptural quality lends itself to Japanese-influenced arrangements and minimalist vase work.
Hellebores appreciate the dappled shade found beneath established trees in many older Australian suburban gardens, particularly in inner Melbourne and the Adelaide foothills. They flower through winter when little else is in bloom, providing fresh material long before their seed pods develop in late spring. Once dried, hellebore carpels take on a parchment-like quality with subtle veining. They are best displayed in smaller arrangements where their delicate form can be appreciated.
Alliums and Iris Foetidissima for Bold Form
Allium seed heads are perhaps the most widely recognised pod forms in dried floral design. Allium cristophii produces spectacular spherical heads up to 25 centimetres across, while Allium 'Globemaster' offers slightly smaller but equally impressive globes. Both dry to a parchment tone that lasts indefinitely and thrive across most Australian climate zones when planted in autumn.
Iris foetidissima earns its unfortunate common name from the smell released when its leaves are crushed, yet its autumn seed display compensates generously. When the seed capsules split open, they reveal rows of bright orange berries that persist well into winter. For readers keen to compare how these perennials perform across different trial sites, the plant evaluation snapshots provide region-specific observations on height, spread, and seed pod development across multiple seasons.
Cardoon, Eryngium, and Poppy Selections
The cardoon (Cynara cardunculus) brings bold, sculptural seed heads that dry to a silvery grey and remain attractive for years. Reaching nearly two metres tall when in flower, it commands attention in the garden and the vase alike. Its close relative the globe artichoke produces similar seed structures, and both thrive in Mediterranean-style climates of South Australia and inland Victoria.
Sea hollies (Eryngium species) produce spiky, thistle-like seed heads with a metallic sheen that intensifies as they dry. Eryngium planum and Eryngium giganteum are particularly valued by Australian growers for their tolerance of poor soils and drought. The seed heads pair naturally with native grasses such as Lomandra, reflecting the bush-friendly aesthetic popular at the Melbourne International Flower and Garden Show.
Oriental poppies (Papaver orientale) complete the selection with their iconic pepper-pot seed capsules. Once the papery petals fall, the smooth, rounded pods develop through summer and can be harvested while still green, or left to dry to a warm beige tone. Echinacea purpurea offers a smaller cone-shaped centre that dries beautifully and adds textural contrast within bouquets.
Australians have embraced dried floristry with enthusiasm, inspired by the longevity of arrangements in our warm, dry homes. Weekend markets in Sydney, Brisbane, and Fremantle regularly feature stalls selling bouquets built around pod-bearing perennials. Local herb societies often host workshops on drying techniques, and many Australian native alternatives, such as banksia and hakea species, complement traditional choices while supporting biodiversity. Always check local council guidelines before harvesting from public land, as native flora is safeguarded under state legislation including the Victorian Flora and Fauna Guarantee Act and equivalent measures elsewhere. Home growers can begin with a few reliable species and expand as confidence grows, harvesting pods on dry days and hanging stems individually in a well-ventilated space away from direct sunlight.
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.