When to plant Black-eyed Susan in Pottawattamie County County,
Pottawattamie County County's climate puts the Black-eyed Susan spring window between April 30 and May 21. time plantings around the expected last-frost window for best survival.
When to Plant Black-eyed Susan in Pottawattamie County, IA
June in the garden — Pottawattamie County, Iowa
Welcome to June in Zone 5b. These are the moves that will have the biggest impact on your growing season.
Before July arrives, get these ready
- Starting indoors: black-eyed susan
- First harvests: black-eyed susan
Rudbeckia hirta (Black-eyed Susan) is one of the most recognizable and adaptable native wildflowers in North America. Its bright golden-yellow daisy petals radiate from a dark brown central cone, providing months of color from midsummer into fall. Technically a short-lived perennial that self-seeds freely — colonies persist indefinitely in the garden — it thrives in poor soils, tolerates drought, and is irresistible to bees, butterflies, and goldfinches.
Pottawattamie County, Iowa is in USDA Zone 5b. The average last spring frost is April 30 and the first fall frost is October 3, giving you a growing season of approximately 156 days.
At an elevation of 518 feet, Pottawattamie County receives approximately 33.2 inches of rainfall annually with predominantly silt loam soil. Summer highs average 87°F, providing good warmth for Black-eyed Susan during the growing season.
Pottawattamie County Soil Profile
Soil Type
Silt Loam
Soil pH
6.1-6.9
Drainage
Well Drained
Black-eyed Susan Planting Risk Windows
Percentages indicate frost risk at transplant. The 70% safe window means there is a 30% chance of frost after transplant — suitable for cold-hardy crops or gardeners with frost protection. The 90% safe window is best for tender plants.
Soil Compatibility in Pottawattamie County
How your county's soil matches Black-eyed Susan's growing requirements.
Soil pH
Your soil pH (6.1–6.9) is within Black-eyed Susan's preferred range (6.0–7.0).
Soil Texture
The silt loam soil in Pottawattamie County is excellent for Black-eyed Susan — good drainage, moisture retention, and nutrient holding capacity.
Organic Matter
Organic matter is excellent (5.0%) — Black-eyed Susan will thrive.
How to Plant Black-eyed Susan
Succession Planting Black-eyed Susan
Sow every 6.9 weeks. Last sowing by Jul 15 to harvest before frost.
Black-eyed Susan Water Budget
Monthly Watering Guide for Black-eyed Susan
Black-eyed Susan needs approximately 0.5 inches of water per week (2.2" per month). Here's how your county's rainfall compares month by month.
| Month | Black-eyed Susan Needs | Rainfall | You Supplement | Action |
|---|---|---|---|---|
| Jan | — | 1.4" | 0" | ❄️ Dormant |
| Feb | — | 1.3" | 0" | ❄️ Dormant |
| Mar | — | 2.2" | 0" | ❄️ Dormant |
| Apr | 2.2" | 3.2" | 0" | ✅ Rainfall sufficient |
| May | 2.2" | 3.9" | 0" | ✅ Rainfall sufficient |
| Jun | 2.2" | 4.3" | 0" | ✅ Rainfall sufficient |
| Jul | 2.2" | 4" | 0" | ✅ Rainfall sufficient |
| Aug | 2.2" | 3.5" | 0" | ✅ Rainfall sufficient |
| Sep | 2.2" | 2.7" | 0" | ✅ Rainfall sufficient |
| Oct | 2.2" | 2.3" | 0" | ✅ Rainfall sufficient |
| Nov | — | 2.4" | 0" | ❄️ Dormant |
| Dec | — | 2" | 0" | ❄️ Dormant |
Water needs are for active growing months only (Apr–Oct in Pottawattamie County). Supplement amounts are based on average rainfall — actual needs vary with temperature, soil, and mulching.
Black-eyed Susan Heat Requirements (GDD)
What are Growing Degree Days (GDD)?
Growing Degree Days measure the total warmth your plants receive during the growing season. Think of it as a "heat bank" — every day above 50°F deposits warmth that helps your plants grow.
Each plant needs a certain amount of accumulated heat to mature. If your county provides more GDD than the plant needs, it's a great fit. If it's close, you may want to choose faster-maturing varieties or start seeds indoors to get a head start.
Black-eyed Susan Planting Timeline — Pottawattamie County, IA
Black-eyed Susan Planting Calendar
| Activity | When | Date Range |
|---|---|---|
| Start Indoors | February 26 | Feb 26 – Mar 12 |
| Transplant Outdoors | May 14 | May 14 – May 28 |
| Direct Sow | April 30 | Apr 30 – May 21 |
| Bloom | July 30 | Jul 30 – Nov 5 |
· 18" apart · Rows 24" apart
Month-by-Month Timeline
| Month | Activities |
|---|---|
| January | — |
| February | Start Indoors |
| March | Start Indoors |
| April | Direct Sow |
| May | Transplant Outdoors Direct Sow |
| June | — |
| July | Bloom |
| August | Bloom |
| September | Bloom |
| October | Bloom |
| November | Bloom |
| December | — |
Growing Conditions
☀️ Sun
Full Sun (6-8+ hours)
💧 Water
0.5"/week · Natural rainfall sufficient
📅 Days to Maturity
60–80 days
🧪 Soil pH
Needs 6–7 · Your soil: ideal
🗺️ USDA Zone
Zone 5b
📆 Growing Season
156 days in Pottawattamie County
Growing Tips for Black-eyed Susan in Pottawattamie County
Direct sow Black-eyed Susan outdoors after April 30 in Pottawattamie County when soil has warmed and frost danger has passed.
Common pests for Black-eyed Susan in this region include aphids and slugs. Use row covers early in the season and inspect plants weekly.
General growing tips
Start seeds indoors 8–10 weeks before last frost or direct-sow after last frost (needs light to germinate — press seeds onto soil surface, do not cover). Thrives in average to poor soil; rich soil causes floppy stems. Deadhead for extended bloom but leave some seed heads for winter wildlife interest and self-seeding. Although technically short-lived (3–5 years), prolific self-seeding maintains the colony. Year 2+ plants bloom most heavily. Divide every 3 years to maintain vigor.
Companion Planting
Good Companions
Check more plant combinations with our Companion Planting Checker →
Black-eyed Susan in Other Locations
Frequently Asked Questions
When should I plant Black-eyed Susan in Pottawattamie County, IA?
Pottawattamie County is in Zone 5b with an average last frost of April 30. Plan your Black-eyed Susan planting based on this frost date — see the calendar above for exact timing.
What planting zone is Pottawattamie County, IA?
Pottawattamie County, Iowa is in USDA Hardiness Zone 5b. The average last spring frost is April 30 and first fall frost is October 3.
When should I plant Black-eyed Susan in Pottawattamie County County, ?
In Pottawattamie County County, , plant Black-eyed Susan after the last frost (around April 30) and before the first frost (around October 3). Best results when soil holds above 50°F.
What growing zone is Pottawattamie County County, for Black-eyed Susan?
Pottawattamie County County sits in USDA Zone 5b. Black-eyed Susan grows reliably in zones 3a through 9b, so it's a good fit here.
Can Black-eyed Susan grow in Pottawattamie County County's climate?
Yes — Black-eyed Susan grows well in Pottawattamie County County's temperate climate. Pottawattamie County County averages a 156-day frost-free season, with last frost around April 30 and first frost around October 3.
Your Pottawattamie County Garden Planner — Free
A 22-page printable planner built for Pottawattamie County (Zone 5b). Planting dates, a month-by-month schedule, harvest log, seed inventory, and succession charts — all dialed in for your exact growing season.