Irises Planting Guide

June

Planting irises in June

Whether you're sowing, transplanting, or harvesting, irises needs the right timing. Check your zone below for exact dates.

Sun full sun

Water low

Days to harvest 60–100

Plant depth 0.5″

Spacing 18″

How to water irises
Water deeply but infrequently. irises prefers to dry out between waterings — soggy soil causes more problems than thirst.
Where to put irises
irises wants at least 6 hours of direct sun. Less than that and you'll get leggy plants with weak yields.
Check your local forecast before planting
Your zone determines the exact week to plant irises. Pick your county below and we'll line everything up against your frost dates.

Show me irises timing for my zone →

Bearded Iris (Iris germanica) are among the most regal flowers of the late-spring garden, producing elegantly ruffled blooms in virtually every color of the rainbow — often in spectacular bicolor combinations. Named for the fuzzy "beard" on the lower falls (petals), bearded irises grow from thick horizontal rhizomes that spread to form dense clumps over time. Individual blooms last only a few days, but a well-established clump produces successive flowers over 3–4 weeks. Many are intensely fragrant. Native iris species including blue flag iris (I. versicolor) and Virginia iris (I. virginica) are excellent choices for wet or native garden settings.

Iris germanica · Flower · Iridaceae family · 60–100 days to maturity

Perennial Blooms in Spring Pollinator-friendly Deer-resistant Good for cutting Fragrant

Why it matters: If you're just starting a flower garden in your area, Irises is a forgiving first pick. It tolerates imperfect soil, mild drought, and the occasional missed watering. The reward: weeks (sometimes months) of continuous color.

Get Your Personalized Irises Planting Dates

Enter your ZIP code to see exact planting dates, soil compatibility, and growing tips specific to your county.

Where Can You Grow Irises?

Zone Compatibility for Irises Zones 3a – 9b

1a 1b 2a 2b 3a 3b 4a 4b 5a 5b 6a 6b 7a 7b 8a 8b 9a 9b 10a 10b 11a 11b 12a 12b 13a 13b

Ideal (data available) Suitable Marginal Not recommended

Planting Dates by Zone

Zone	Start Indoors	Direct Sow	Transplant	Bloom
Zone 3a	—	—	May 29	Jul 24 – Aug 21
Zone 3b	—	—	May 24	Jul 19 – Aug 16
Zone 4a	—	—	May 20	Jul 15 – Aug 12
Zone 4b	—	—	May 15	Jul 10 – Aug 14
Zone 5a	—	—	May 9	Jul 4 – Aug 8
Zone 5b	—	—	May 2	Jun 27 – Aug 1
Zone 6a	—	—	Apr 17	Jun 12 – Jul 10
Zone 6b	—	—	Apr 10	Jun 5 – Jul 3
Zone 7a	—	—	Apr 1	May 20 – Jun 24
Zone 7b	—	—	Mar 25	May 13 – Jun 17
Zone 8a	—	—	Mar 8	Apr 26 – May 31
Zone 8b	—	—	Feb 18	Apr 8 – May 13
Zone 9a	—	—	Jan 27	Mar 17 – Apr 21
Zone 9b	—	—	Jan 4	Feb 22 – Mar 29

Why are some columns showing "—"?

Start Indoors shows "—" because Irises is typically direct sown outdoors rather than started indoors. It germinates quickly and doesn't transplant well.

Direct Sow shows "—" because Irises benefits from being started indoors first, then transplanted after the last frost.

How to Plant Irises

0.5"

Planting Depth

18"

Between Plants

24"

Between Rows

Growing Conditions

☀️ Sun

Full Sun (6-8+ hours)

💧 Water

Low — drought tolerant

Drought tolerant — water only when soil is dry 2" deep.

🧪 Soil pH

6.8 – 7

Prefers neutral to slightly acidic soil — ideal for most garden beds.

🗺️ Hardiness Zones

Zone 3a – 9b

📅 Days to Maturity

60–100 days

Quick-growing crop. Multiple plantings per season are possible.

👪 Plant Family

Iridaceae

Rotate with other families yearly to prevent soil-borne diseases. Don't plant in the same spot where Iridaceae family crops grew last year.

Succession Planting Irises

Irises matures in just 60–100 days, making it ideal for succession planting. In a typical 180-day growing season, you can get up to 3 successive plantings by sowing every 6.9 weeks.

Your actual succession count depends on your local frost dates. Enter your ZIP code to get personalized succession planting dates for your area.

Companion Planting for Irises

✅ Good Companions

Peonies Salvia Alliums Roses Catmint

Check more combinations with our Companion Planting Checker →

Growing Tips for Irises

Plant rhizomes in late summer to early fall (July–September) after bloom season, setting them horizontally with the top of the rhizome at or just slightly below soil surface — never deeply buried. Full sun is essential for best bloom; at least 6 hours. Well-drained soil is critical; wet rhizomes rot in winter. After bloom, remove flower stalks but leave foliage until it browns in fall. Divide every 3–5 years in late summer when clumps become congested (crowded rhizomes stop blooming). Iris borer is the primary pest — remove and destroy affected fans. Year 2+ after division delivers the most bloom; freshly divided rhizomes may have limited or no bloom in their first season.

Saving Irises Seeds

Recommended for Your Garden

🌱

Seed Starting Trays $8-20

Start seeds indoors with reusable cell trays and humidity domes.

🧪

Soil Test Kit $12-25

Test your soil pH, nitrogen, phosphorus, and potassium levels before planting.

🏷️

Garden Plant Markers $6-12

Keep your garden organized with durable, weather-resistant plant labels.

Reader favourite

Seed Saving & Storage Guide

$27 $157 value

Most saved seeds go bad before next season. This shows exactly when to pick, how to dry, and where to store seeds from 200 plants so yours don't.

200 plants, step-by-step: life cycle, pollination type, isolation
Exact temperature + humidity ranges that keep seeds viable
Bonus: searchable Google Sheets tracker + custom GPT assistant

Save a lifetime of seed money →

Irises by State

Frequently Asked Questions

How long does it take to grow Irises?

Irises (Iris germanica) takes 60 to 100 days from planting to harvest. Exact timing depends on your variety, growing conditions, and USDA zone.

What zones can Irises grow in?

Irises can be grown in USDA zones 3a through 9b. Use the planting calendar above to find the exact dates for your zone.

How much sun does Irises need?

Growing Irises requires Full Sun (6-8+ hours), Low — drought tolerant, and soil pH of 6.8 to 7.