Species

129 other cultivars

perennial

Silken Trim Iris

The Story

Plant Bio

Iris x germanica, the German iris, is an upright, clump-forming herbaceous perennial characterized by rigid, sword-shaped blue-green leaves arranged in flat, two-ranked fans. These plants spread via thick, fleshy creeping rhizomes that sit on the soil surface and require sharp drainage to prevent rot.

'Silken Trim' is a tall bearded cultivar distinguished by its large, ruffled flowers featuring wine-red standards, darker purple-red falls, a delicate caramel heart, and dark yellow beards. The blooms are carried on sturdy, double-branched stalks with double-socketed buds that reach up to 36 inches in height.

Uses & Benefits:

Produces large, ruffled, bicolored purple and wine-red flowers on tall, architectural stems above clean, blue-green foliage fans.

Provides excellent, long-lasting cut flowers and exhibits high resistance to browsing deer and rabbits.

Attracts native bees, honeybees, and other insect pollinators to the garden during its late spring bloom.

SpeciesIris x germanicaGerman Iris

Essentials

At a Glance

Plant Type

Perennial

Height

36"

Width

24"

Light

Full Sun, Partial Sun

Zones

4, 5, 6, 7, 8, 9

Water

Low

Humidity

Moderate

Lifespan

Perennial

Native To

Europe

Toxicity

Toxic to Pets

Bloom period

Late spring – Early summer

In flower about 2 months of the year

Planting

How to Grow

Select a planting site in full sun with highly well-drained, neutral to alkaline soil.
Dig a shallow hole and build a central mound of soil, then place the rhizome on top so its upper surface remains exposed.
Spread the roots down the sides of the mound, fill in with soil, and firm gently to anchor the plant.
Water thoroughly at planting, but keep subsequent watering minimal to avoid waterlogging the rhizomes.

Pro Tip

Leave the upper surface of the rhizomes exposed to the sun and air; burying them under soil or heavy organic mulch traps moisture and triggers fatal bacterial soft rot.

Keep It Thriving

Care Guide

Do

Expose the top of the rhizome to direct sunlight and air.
Trim foliage fans back to six inches in late fall to reduce wind-rock and remove overwintering pests.
Divide overgrown clumps every three to four years in mid-to-late summer.

Don't

Do not cover the rhizomes with mulch or bury them deeply in the soil.
Do not apply high-nitrogen fertilizers, which stimulate soft, rot-prone foliage at the expense of blooms.
Do not plant in heavy clay or poorly drained, waterlogged areas.

Seasonal Care Calendar

Task	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Deadhead
Divide
Fertilize
Prune
Winter Prep

Watch Out For

Pests & Diseases

Common Pests

Common Diseases

In the Garden

Landscape Uses & Companions

Landscape Uses

Cottage GardensMixed BordersCutting GardensMediterranean Gardens

Companion Plants

Salvia Nepeta Paeonia Stachys byzantina

Multiply

Propagation Methods

Good to Know

Common Questions

Silken Trim Iris questions

What zones can Silken Trim Iris grow in?

Silken Trim Iris is hardy in USDA Zones 4–9: in that range it survives winter in the ground. Warmer than Zone 9, winter isn't the problem: it prefers colder winters, and summer heat can shorten its life.

Is Silken Trim Iris deer resistant?

Yes — Silken Trim Iris is rated deer-resistant. Deer typically pass it over, though extreme hunger can override any plant's defenses.

When does Silken Trim Iris bloom?

Silken Trim Iris typically blooms from late spring to early summer. Exact timing shifts a week or two with your zone — Sow's bloom calendar maps it to your garden.

Does Silken Trim Iris need full sun?

Silken Trim Iris does best in full sun to part shade. In hot climates, afternoon shade keeps blooms fresher longer.

Is Silken Trim Iris drought tolerant?

Yes — once established (usually after the first full season), Silken Trim Iris handles dry spells with minimal watering. Water deeply its first year to build the root system that makes that possible.