When to plant Irises in Daviess County, IN
Daviess County's short 190-day growing season means one Irises planting between April 21 and May 5. No fall crop in Zone 6b.
When to Plant Irises in Daviess County, IN
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.
Daviess County, Indiana is in USDA Zone 6b. The average last spring frost is April 14 and the first fall frost is October 21, giving you a growing season of approximately 190 days.
At an elevation of 806 feet, Daviess County receives approximately 32.7 inches of rainfall annually with predominantly silt loam soil. Summer highs average 88°F, providing good warmth for Irises during the growing season.
Daviess County Soil Profile
Soil Type
Silt Loam
Soil pH
6.0-7.0
Drainage
Well Drained
Irises Planting Timeline — Daviess County, IN
Irises Planting Calendar
| Activity | When | Date Range |
|---|---|---|
| Transplant Outdoors | April 21 | Apr 21 – May 5 |
| Bloom | June 16 | Jun 16 – Jul 14 |
Plant 0.5" deep · 18" apart · Rows 24" apart
Month-by-Month Timeline
| Month | Activities |
|---|---|
| January | — |
| February | — |
| March | — |
| April | Transplant Outdoors |
| May | Transplant Outdoors |
| June | Bloom |
| July | Bloom |
| August | — |
| September | — |
| October | — |
| November | — |
| December | — |
Growing Conditions
☀️ Sun
Full Sun (6-8+ hours)
💧 Water
Low — drought tolerant
📅 Days to Maturity
60–100 days
🧪 Soil pH
Needs 6.8–7 · Your soil: N/A
🗺️ USDA Zone
Zone 6b
📆 Growing Season
190 days in Daviess County
Growing Tips for Daviess County
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.
Companion Planting
Good Companions
Check more plant combinations with our Companion Planting Checker →
Irises in Other Locations
Frequently Asked Questions
When should I plant Irises in Daviess County, IN?
Daviess County is in Zone 6b with an average last frost of April 14. Plan your Irises planting based on this frost date — see the calendar above for exact timing.
What planting zone is Daviess County, IN?
Daviess County, Indiana is in USDA Hardiness Zone 6b. The average last spring frost is April 14 and first fall frost is October 21.
When should I plant Irises in Daviess County, IN?
In Daviess County, IN, plant Irises after the last frost (around April 14) and before the first frost (around October 21). Best results when soil holds above 50°F.
What growing zone is Daviess County, IN for Irises?
Daviess County sits in USDA Zone 6b. Irises grows reliably in zones 3a through 9b, so it's a good fit here.
Can Irises grow in Daviess County's climate?
Yes — Irises grows well in Daviess County's temperate climate. Daviess County averages a 190-day frost-free season, with last frost around April 14 and first frost around October 21.
Your Daviess County Garden Planner — Free
A 22-page printable planner built for Daviess County (Zone 6b). Planting dates, a month-by-month schedule, harvest log, seed inventory, and succession charts — all dialed in for your exact growing season.