When to plant Astilbe in Marshall County, MS
Plant Astilbe in Marshall County, between April 3 and April 17 — the only viable window. Zone 7b's short season (218 frost-free days) rules out a fall crop.
When to Plant Astilbe in Marshall County, MS
Astilbe (Astilbe x arendsii) is a premier perennial for shaded, moist gardens, producing feathery plume-like flower spikes in shades of pink, red, white, and lavender above deeply cut, ferny foliage. Originating in Asia and naturalized in shade gardens worldwide, astilbe thrives where many sun-lovers fail: under trees, beside water features, or in persistently moist woodland borders. The dried flower plumes remain attractive through fall and winter. Different cultivars extend the bloom season from early summer through early fall when several varieties are combined.
Marshall County, Mississippi is in USDA Zone 7b. The average last spring frost is March 27 and the first fall frost is October 31, giving you a growing season of approximately 218 days.
At an elevation of 255 feet, Marshall County receives approximately 52.1 inches of rainfall annually with predominantly clay loam soil. Summer highs average 93°F, providing good warmth for Astilbe during the growing season. Clay soil retains moisture well for Astilbe, but amend with compost to improve drainage and prevent root rot. Ample rainfall means less supplemental watering, but ensure good drainage to prevent Astilbe root diseases.
Marshall County Soil Profile
Soil Type
Clay Loam
Soil pH
6.0-7.0
Drainage
Well Drained
Astilbe Planting Timeline — Marshall County, MS
Astilbe Planting Calendar
| Activity | When | Date Range |
|---|---|---|
| Start Indoors | January 23 | Jan 23 – Feb 6 |
| Transplant Outdoors | April 3 | Apr 3 – Apr 17 |
| Bloom | June 12 | Jun 12 – Aug 7 |
Plant 1.5" deep · 18" apart · Rows 24" apart
Month-by-Month Timeline
| Month | Activities |
|---|---|
| January | Start Indoors |
| February | Start Indoors |
| March | — |
| April | Transplant Outdoors |
| May | — |
| June | Bloom |
| July | Bloom |
| August | Bloom |
| September | — |
| October | — |
| November | — |
| December | — |
Growing Conditions
☀️ Sun
Partial Shade (3-6 hours)
💧 Water
High — keep soil consistently moist
📅 Days to Maturity
70–100 days
🧪 Soil pH
Needs 6–8 · Your soil: N/A
🗺️ USDA Zone
Zone 7b
📆 Growing Season
218 days in Marshall County
Growing Tips for Marshall County
Plant bare-root crowns in spring as soon as the ground is workable, setting eyes 1–2 inches below soil level. Fall planting (Zones 4+) is equally effective. Consistent moisture is non-negotiable — astilbe will wilt and scorch in drought. Amend with generous compost to improve moisture retention. Partial shade (morning sun, afternoon shade) is ideal; deep shade reduces bloom but foliage remains. Fertilize lightly in spring with a balanced slow-release granular. Divide every 3–5 years in early spring as clumps become congested. Leave plumes standing through winter for ornamental interest and wildlife value. Year 2+ plants produce the fullest bloom spikes; first-year crowns may flower lightly or not at all.
Companion Planting
Good Companions
Check more plant combinations with our Companion Planting Checker →
Astilbe in Other Locations
Frequently Asked Questions
When should I plant Astilbe in Marshall County, MS?
Marshall County is in Zone 7b with an average last frost of March 27. Plan your Astilbe planting based on this frost date — see the calendar above for exact timing.
What planting zone is Marshall County, MS?
Marshall County, Mississippi is in USDA Hardiness Zone 7b. The average last spring frost is March 27 and first fall frost is October 31.
When should I plant Astilbe in Marshall County, MS?
In Marshall County, MS, plant Astilbe after the last frost (around March 27) and before the first frost (around October 31). Best results when soil holds above 50°F.
What growing zone is Marshall County, MS for Astilbe?
Marshall County sits in USDA Zone 7b. Astilbe grows reliably in zones 3a through 8b, so it's a good fit here.
Can Astilbe grow in Marshall County's climate?
Yes — Astilbe grows well in Marshall County's temperate climate. Marshall County averages a 218-day frost-free season, with last frost around March 27 and first frost around October 31.
Your Marshall County Garden Planner — Free
A 22-page printable planner built for Marshall County (Zone 7b). Planting dates, a month-by-month schedule, harvest log, seed inventory, and succession charts — all dialed in for your exact growing season.