Siberian Iris 'Silver Edge'

Multi Buy

Size Guide
5.5
5.5" Perennial
3 or more $14.00 ea
Regularly: $14.99 ea

Siberian Iris 'Silver Edge'

Scott's Nursery Ltd.

$14.99
Title
Introduce a cool, crisp wave of sophisticated elegance to your garden beds with this classic, award-winning masterpiece. This refined variety forms a neat, highly structural clump of upright, slender, sword-like blue-green leaves that perfectly mimic a premium architectural grass. Rising gracefully just above this dense foliage frame are large, satiny blossoms displaying a strikingly regal palette. The upright standard petals showcase a bright, clear sky-blue, while the wide, spreading lower petals flare out in a deep, velvety royal blue. Each lower petal is highlighted by a glowing canary-yellow and white throat and detailed with a breath of pure artistry—a crisp, contrasting, silken border of pure silver-white. It creates an impeccably tailored, luminous look that shines beautifully in the midday sun.
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Plant Details

Mature Size:

24-30" H x 18-24" W

Zone:

3-9

Watering:

Medium to High

Type:

Herbaceous Perennial

Growth Rate:

Moderate

Light:

Full Sun/Partial Shade

Plant Profile

Common Names:

Silver Edge Siberian Iris, Silver Edge Siberian Flag, Blue Flag Iris

Scientific Name:

Iris sibirica 'Silver Edge'

Type:

Thriller / Aquatic / New-Age Ornamental Perennial

Growth Details:

Mature Size: Height of 60–75 cm (24–30 inches) x Width of 45–60 cm (18–24 inches).

Growth Habit: Upright, clumping, and slowly expanding.

Form: Erect, fan-shaped architectural foliage topped with stiff, vertical flower stalks.

Growth Rate: Moderate; builds a solid, established clump over two to three seasons before blooming in maximum profusion.

Flowering: Highly detailed, flat-formed flag-type flowers featuring a prominent white and silver halo.

Flowering Time: Late spring to early summer (blooms reliably after tall bearded irises but right before Japanese irises).

Flower Colour: Sky-blue standards and deep royal blue falls beautifully rimmed with a distinct, clean silver-white edge.

Environmental Needs:

Exposure: Full sun to partial shade (prefers at least 6 hours of direct sunlight for maximum bloom power).

Soil Preferences: Thrives in rich, fertile, moist to wet soils that are organically heavy and moderately acidic (\(5.2 - 6.4\)).

Soil Tolerance: Highly forgiving. Easily tolerates heavy clay, wet soils, muck, and loamy conditions, but performs poorly in dry desert sand or highly alkaline limestone ground.

Watering: Moderate to high. Thrives beautifully in water-heavy margins and seasonal low spots where other perennials often drown.

Container Role: Functions as a stunning, vertical Thriller in aquatic container gardens, patio bog bowls, or damp planters.

Special Features:

Disease Resistances: Exceptionally robust; highly resistant to typical iris pests like iris borer and terrestrial crown rot.

Native Species: Derived from species native to the damp meadows and river valleys of Europe and Central Asia.

Fast Growing: Steadily doubles its crown density year after year.

Attracts: Frequently draws in butterflies, native bees, and migrating honeybees.

Uses: Unique cut flowers, rain garden structuring, pond-side accents, and low-maintenance borders.

Resistance: Notably resistant to drought (once fully established), heat, deer, rabbits, and juglone (black walnut toxicity).

Ornamental & Landscape Value

Seasonal Interest:

  • Bloom Information: Features elegantly formed flag blossoms with high, dramatic showiness and a light, delicate fragrance.
  • Fall Colour: Strap-like leaves turn a handsome copper-straw yellow in late autumn before melting back for winter dormancy.

Garden Value:

Ornamental Interest: Delivers high artistic contrast through its silver-rimmed blue blossoms against a crisp, fine-textured grass-like foliage mound.

Landscaping Uses: Perfect for sophisticated perennial borders, rain gardens, naturalized pond edges, stream margins, bioswales, and luxury cutting beds.

Garden/Landscape Benefits: Provides excellent architectural structure, naturalizes beautifully over time into larger colonies, and easily survives under Black Walnut trees since it is completely immune to juglone toxicity.

Wildlife & Human Value:

Wildlife Value: Offers an invaluable early-summer nectar source for native pollinators and provides structure for local pond-side biodiversity.

Human Value: Perfect for eco-friendly stormwater management (rain gardens) and heavy clay yards where traditional garden irises fail. The unique silver-rimmed blooms provide a sophisticated, florist-grade cut flower for home vases.

Planting & Care Guide

Planting Considerations:

Best Time To Plant: Early spring or early autumn when temperatures are cool and moisture levels are naturally high.

Spacing: Space 45–60 cm (18–24 inches) apart from the center to give the rhizomes room to safely spread and form a seamless mass.

Location Tips: Plant with the top of the rhizome resting roughly 1 to 2 inches below the soil surface. Choose damp areas, rain gardens, or shoreline zones where soil rarely dries out entirely.

Companion Plants: Pairs exquisitely in mass plantings or mixed with Caltha palustris (Marsh Marigold), Astilbes, Lobelia cardinalis (Cardinal Flower), and yellow-toned Daylilies.

Care:

Light Requirements: Thrives best in full sun to produce the maximum number of flower stalks, but easily adapts to light afternoon shade.

Moisture Requirements: Requires plenty of water throughout the active growing season; thrives in moist, wet, or boggy soils but can handle normal garden moisture if never allowed to bake completely bone-dry.

Maintenance: Low maintenance. Snip away old flower stems down to the base after the blooming period ends to keep the clump looking tidy. Leave the architectural green foliage alone until it naturally withers, then remove dead leaves in late autumn or early spring.

Fertilization: Apply a single application of balanced, organic perennial fertilizer or a light top-dressing of rich compost once per year in early spring as fresh shoots emerge.

Tolerances:

Damp soil and temporary flooding tolerant, Heavy clay soil tolerant, Black walnut tree tolerant (resists juglone), Cold and deep frost tolerant, Deer and rabbit resistant

Tips For Success:

Thinning/Pinching: Unlike bearded varieties, deadheading will not force reblooming. Leave the plant undisturbed until you notice a clear drop in bloom production (typically every 4 to 5 years), then divide the clump in early autumn.

Support/Staking: Completely unnecessary; the slender, fibrous stems are specifically bred to remain rigid and wind-resistant.

Mulching: Apply a 5 cm (2-inch) layer of shredded leaves or pine bark around the base to preserve moisture and mimic a natural damp meadow setting.

Winter Protection: Apply a fresh layer of mulch over the crown in late autumn to prevent winter frost-heaving, especially during its first season in the ground