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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Spotted Deadnettle or Bugleweed for Chicagoland Ground Cover

Ground cover plants can solve several landscape problems at once: they suppress weeds, soften hard edges, protect soil from erosion, and fill spaces where turf is difficult to maintain. In the Chicagoland region, however, a successful choice must handle cold winters, humid summers, clay-heavy soils, spring moisture, and periods of drought.

Spotted deadnettle and bugleweed are two widely available perennials that often appear in the same design conversations. Both spread across the soil surface, produce attractive foliage, and offer flowers in spring or early summer. Their performance differs significantly once light, drainage, vigor, and maintenance are considered.

The best selection depends less on which plant looks appealing at the garden center and more on how closely its growing conditions match your site. Regional observations from programs such as regional trial mission can help gardeners weigh those differences against local growing conditions.

Growth habit and visual character

Spotted deadnettle, usually sold under the botanical name Lamium maculatum, forms a relatively low mat of soft, often silver-marked foliage. Its stems can root where they touch the soil, allowing the plant to weave between established perennials without creating a dense, uniform carpet. Pink, purple, or white flowers appear above the leaves, commonly in late spring and intermittently afterward.

Bugleweed, or Ajuga reptans, has a more compact and assertive spreading habit. Its glossy, textured leaves form rosettes connected by runners called stolons. Depending on the cultivar, foliage may be green, burgundy, bronze, purple, or variegated. Short flower spikes in blue, purple, pink, or white rise above the foliage in spring.

The difference is especially noticeable at the edge of a planting bed. Spotted deadnettle tends to look looser and more draped, while bugleweed creates a tighter, more continuous groundcover layer. That distinction affects both appearance and how easily each plant can be kept within its intended boundaries.

Light, soil, and moisture

Spotted deadnettle is generally most dependable in part shade, especially where it receives morning sun and afternoon protection. Too much intense summer sun can scorch or bleach the foliage, while deep shade may reduce flowering and create a thinner habit. It prefers evenly moist, well-drained soil enriched with organic matter.

Bugleweed tolerates a broader range of light conditions. Many cultivars grow well in partial shade, and some handle several hours of sun when the soil does not dry excessively. It can also adapt to heavier soils, although consistently wet locations may lead to crown or root problems. Good drainage is important during Chicago-area winters, when frozen and saturated soil can damage crowns.

Neither plant should be treated as a solution for every difficult location. Dry shade beneath mature trees can challenge both, particularly during establishment. Bugleweed may spread faster in a favorable site, but rapid coverage does not mean it will remain attractive without sufficient moisture. Spotted deadnettle may need more attention in exposed or drought-prone beds.

Seasonal performance in the Midwest

In a Chicagoland garden, spotted deadnettle often provides a longer season of visual interest because its foliage can remain attractive after the primary bloom period. Silver markings brighten shaded beds, and many cultivars keep a fresh appearance through summer when moisture is adequate. Flowering may repeat if spent stems are removed and the plant avoids heat stress.

Bugleweed offers strong spring impact, particularly when a mass planting is in bloom. Its foliage can remain colorful through summer and fall, but some cultivars may develop a ragged appearance in hot, humid conditions. Light shearing after flowering can refresh the planting and remove spent flower spikes.

Winter behavior varies by cultivar and exposure. Both perennials are generally hardy in the region, yet foliage can suffer from snow cover, ice, salt spray, or alternating freeze-thaw cycles. A clean-up in early spring is often more useful than cutting plants back aggressively in autumn, when remaining foliage can provide modest protection.

Characteristic Spotted deadnettle Bugleweed
Botanical name Lamium maculatum Ajuga reptans
Typical height 4–8 inches, with trailing stems 4–8 inches, with upright flower spikes
Flower colors Pink, purple, white Blue, purple, pink, white
Best light Part shade to shade Part shade; some cultivars tolerate more sun
Foliage interest Silver markings, green, gold, or variegated forms Green, bronze, burgundy, purple, or variegated forms
Spread Moderate, often easier to weave through other plants Fast and dense under favorable conditions
Main strength Long-lasting foliage and soft texture Rapid coverage and strong spring color
Main concern Can thin in dry or hot locations Can become invasive within beds or lawns

Spread, maintenance, and control

Spotted deadnettle is often easier to manage in a mixed perennial border. Its stems spread along the ground, but the plant usually allows neighboring plants to remain visible. Trimming back wandering stems in late spring or after flowering can maintain a clean edge. Some cultivars are more vigorous than others, so labels and local trial information are worth checking.

Bugleweed is valuable when quick soil coverage is the priority, yet its stolons can travel beyond the original planting area. They may move into lawn, cracks in paving, or nearby beds. A defined border, regular edging, and prompt removal of unwanted runners can prevent a small patch from becoming a persistent maintenance issue.

Avoid planting either species where they will be difficult to monitor. A groundcover that escapes into natural areas can be challenging to remove, particularly when it competes with native woodland or prairie vegetation. Choose noninvasive alternatives for sites adjacent to sensitive habitats, and confirm how a particular cultivar behaves in local conditions rather than relying only on the species name.

Flowers, foliage, and garden design

Choose spotted deadnettle when the planting needs a cool, luminous effect beneath shrubs or along a north-facing foundation. Its foliage pairs well with ferns, hostas, heucheras, woodland phlox, and spring bulbs. White-flowered selections can brighten dim corners, while purple or pink blooms create a softer, cottage-garden appearance.

Bugleweed works well for stronger blocks of color around stepping stones, beneath trees, or between larger perennials. Burgundy and bronze cultivars contrast effectively with chartreuse foliage, while blue flower spikes complement yellow daffodils and golden groundcovers. Because its growth is dense, it can also visually unify a bed with many unrelated plants.

Consider mature spread before spacing plants. Closely planted bugleweed may fill quickly but require division or edging sooner. Spotted deadnettle can be placed to allow its stems to trail naturally, especially on slopes or over low retaining walls. In both cases, repeated small groups usually look more intentional than isolated single plants.

Which ground cover fits your site

For a shaded border that needs foliage brightness and a less forceful spread, spotted deadnettle is often the better fit. It suits gardeners who want a ground layer that blends with other perennials and can be shaped with occasional trimming. It is also a useful choice where silver or variegated leaves are more important than a solid carpet.

Bugleweed is the stronger candidate for rapid coverage, spring flowers, and bold foliage color. It can perform well in larger beds where its runners have room to expand and where the gardener can maintain a clear boundary. Its vigor becomes a liability when planted beside lawn, natural areas, or small, slow-growing perennials.

Evaluate drainage, sunlight, soil moisture, and the amount of maintenance available before deciding. A plant that performs beautifully in one Chicagoland garden may struggle or spread excessively in another. Trial results and observations from multiple gardens are especially valuable because they reveal how cultivars behave across changing seasons.

Practical recommendations for planting

  • Select spotted deadnettle for part-shaded beds with organic, evenly moist soil and a preference for silver or variegated foliage.
  • Choose bugleweed when fast coverage and colorful spring flower spikes are more important than a restrained growth habit.
  • Install a physical or regularly maintained edge around bugleweed, especially near turf, sidewalks, and naturalized plantings.
  • Water either perennial consistently during its first growing season, then adjust irrigation according to rainfall, soil, and exposure.
  • Remove damaged foliage and unwanted runners in spring, and divide overcrowded clumps before they weaken nearby plants.

A small trial planting can reveal more than a single photograph or catalog description. Observe coverage, winter survival, flowering, foliage quality, and spread through at least two growing seasons. Record which cultivars remain attractive during summer heat and which stay manageable beside other perennials.

Use those observations to choose plants that match the specific conditions of your garden rather than selecting solely by flower color. With thoughtful placement and regular monitoring, either spotted deadnettle or bugleweed can provide durable ground-level interest in the Chicagoland landscape. Review regional evaluations, compare available cultivars, and plant the option that fits both your site and your maintenance expectations.

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