When to Plant Ageratum in Moncton, NB
Ageratum (Ageratum houstonianum), the floss flower, produces clusters of fluffy, powder-puff blooms in the rare sky-blue and lavender tones difficult to find among warm-season annuals. Compact mounding habit makes it ideal as a front-of-border edging plant. Blooms from early summer through fall with minimal deadheading; heat and humidity tolerant once established.
Moncton, New Brunswick is in USDA Zone 6a. The average last spring frost is April 21 and the first fall frost is October 18, giving you a growing season of approximately 180 days.
At an elevation of 32 feet, Moncton receives approximately 38.1 inches of rainfall annually with predominantly gray-brown podzol soil. Summer highs average 81°F, so choose short-season varieties of Ageratum to ensure they mature before fall.
Moncton Soil Profile
Soil Type
Gray-Brown Podzol
Soil pH
6.0-7.0
Drainage
Well Drained
Ageratum Planting Timeline — Moncton, NB
Ageratum Planting Calendar
| Activity | When | Date Range |
|---|---|---|
| Start Indoors | March 3 | Mar 3 – Mar 17 |
| Transplant Outdoors | April 21 | Apr 21 – May 5 |
| Direct Sow | April 21 | Apr 21 – May 12 |
| Bloom | June 16 | Jun 16 – Sep 22 |
· 8" apart · Rows 10" apart
Month-by-Month Timeline
| Month | Activities |
|---|---|
| January | — |
| February | — |
| March | Start Indoors |
| April | Transplant Outdoors Direct Sow |
| May | Transplant Outdoors Direct Sow |
| June | Bloom |
| July | Bloom |
| August | Bloom |
| September | Bloom |
| October | — |
| November | — |
| December | — |
Growing Conditions
☀️ Sun
Full Sun (6-8+ hours)
💧 Water
Moderate — regular watering
📅 Days to Maturity
60–75 days
🧪 Soil pH
Needs 6–7 · Your soil: N/A
🗺️ USDA Zone
Zone 6a
📆 Growing Season
180 days in Moncton
Growing Tips for Moncton
Start seeds indoors 6–8 weeks before last frost — do not cover seed; it needs light to germinate. Can be direct-sown after last frost once soil warms to 60°F. Transplant or thin to proper spacing after frost danger passes. Deadheading isn't strictly required but tidying spent clusters improves appearance. Provide consistent moisture; drought causes premature setting. Avoid deep shade — blooms best in full sun to light afternoon shade.
Companion Planting
Good Companions
Check more plant combinations with our Companion Planting Checker →
Ageratum in Other Locations
Frequently Asked Questions
When should I plant Ageratum in Moncton, NB?
Moncton is in Zone 6a with an average last frost of April 21. Plan your Ageratum planting based on this frost date — see the calendar above for exact timing.
What planting zone is Moncton, NB?
Moncton, New Brunswick is in USDA Hardiness Zone 6a. The average last spring frost is April 21 and first fall frost is October 18.
Your Moncton Garden Planner — Free
A 22-page printable planner built for Moncton (Zone 6a). Planting dates, a month-by-month schedule, harvest log, seed inventory, and succession charts — all dialed in for your exact growing season.