Iris x hollandica 'Delft Blue'
bulb corm tuber

Iris x hollandica 'Delft Blue'

Dutch Iris 'Delft Blue'

Not currently listed at our partner nurseries.

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Essentials

At a Glance

Plant Type

Bulb Corm Tuber

Height

22 inches

Width

6 inches

Light

Full Sun, Partial Sun

Zones

5, 6, 7, 8, 9

Water

Average moisture during growth; keep dry when dormant

Humidity

Prefers dry to moderate humidity

Lifespan

Perennial

Native To

Garden origin

Toxicity

All parts are toxic if ingested; can cause skin irritation.

The Story

Plant Bio

Iris x hollandica, or Dutch Iris, are bulbous perennials resulting from complex crosses of several iris species. They are prized for their elegant, orchid-like flowers on tall, slender stems, making them exceptional cut flowers. Named after the famous Dutch pottery, 'Delft Blue' features flowers with light blue standards and deep violet-blue falls, each marked with a striking yellow-orange blotch. The flowers are borne on sturdy stems, ideal for cutting.

Bloom Period:

J
F
M
A
M
J
J
A
S
O
N
D
EarlyLate

Uses & Benefits:

Ornamental UsesProvides striking blue flowers in early spring, enhancing garden aesthetics.
Practical UsesEasy to grow with minimal maintenance, suitable for naturalized areas.
Ecological BenefitsSupports pollinators like bees and butterflies during bloom.

Marketplace

Where to Buy

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Planting

How to Grow

  1. Tuck bulbs 4-6 inches deep in well-draining soil in early fall.
  2. Water thoroughly after planting to settle soil around bulbs.
  3. Thin out overcrowded clumps after foliage dies back, typically every 3-4 years.
  4. Divide and replant in late summer or early fall for best results.
  5. Mulch lightly to retain moisture and suppress weeds during growing season.
  6. Monitor for pests and diseases, and remove any affected foliage promptly.

Pro Tip

Plant in full sun for vibrant blooms and ensure excellent drainage to prevent bulb rot.

Keep It Thriving

Care Guide

Do

  • Water during dry spells in growing season 💧
  • Apply a balanced fertilizer in early spring 🌱
  • Remove spent flowers to encourage healthy foliage
  • Mulch to conserve moisture and regulate soil temperature

Don't

  • Never plant in poorly drained soil ❌
  • Avoid overwatering in winter ❌
  • Don’t ignore pest signs or disease symptoms
  • Refrain from cutting back foliage prematurely

Seasonal Care Calendar

TaskJanFebMarAprMayJunJulAugSepOctNovDec
Deadhead
Fertilize
Harvest
Plant
Spring Cleanup

Watch Out For

Pests & Diseases

Common Pests

Common Diseases

In the Garden

Landscape Uses & Companions

Landscape Uses

Violet‑flowered border with a sweet scentClumps in rock gardens for striking vertical accentsPlant along pathways for early spring color

Companion Plants

Daylilies Alliums Peonies Lavender Sedum

Multiply

Propagation Methods

Good to Know

Common Questions