When to Plant Echinacea (Coneflower) in Mesa, Idaho (83643)

Location

Mesa, Idaho

ZIP Code

83643

USDA Zone

Last Frost

Monday, April 20, 2026

📅 Planting Calendar

Start Seeds Indoors Monday, February 9, 2026

Transplant Outdoors Monday, May 4, 2026

Pro Tip: Start Echinacea (Coneflower) seeds indoors 10 weeks before your last frost date, then transplant outdoors around Monday, May 4, 2026.

🌿 Plant Details

Scientific Name Echinacea purpurea

Days to Maturity 365 days

Mature Height 24-48"

Spread 24"

Type Perennial

☀️ Growing Requirements

☀️

Sun

Full Sun to Partial Shade

💧

Water

Low (drought tolerant once established)

↔️

Spacing

18" apart

🌱

Planting Depth

0.25" deep

Seeds typically germinate in 14-21 days

Ready to Plant Echinacea (Coneflower) in Mesa?

Get your seeds now so they're ready by Monday, February 9, 2026.

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🤝 Good Companions

Black-eyed SusanLavenderSage

See the full companion planting guide for Echinacea (Coneflower) →

🛠️ Supplies You'll Need

🌱 Seed Starting Trays 🪴 Seed Starting Mix 💡 Grow Lights 🌡️ Heat Mat 🌍 Flower Garden Soil ✂️ Pruning Shears 🚿 Watering Can

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🌾 Seed Saving Guide

🟢 Easy

✅ Open-pollinated — seeds grow true to parent

When to Harvest Seed

Allow seed heads to dry fully on the plant through fall. Leave for birds or harvest before winter.

Processing

Wear gloves — seed heads are spiky. Rub seeds out with gloved hands, spread to dry 1 week.

Seed Viability

Up to 2 years when stored cool, dark, and dry.

Pro Tip

Cold-stratify seeds for 4–8 weeks to significantly improve germination rates.

🪴

Raised Bed Planting Guides

A 4×8 bed fits 14 plants of Echinacea (Coneflower). See plant counts, spacing grids, and companion pairings for every bed size →

Frequently Asked Questions

When should I plant Echinacea (Coneflower) in Mesa, Idaho? +

In Mesa (Zone 6a), start Echinacea (Coneflower) seeds indoors around Monday, February 9, 2026 and transplant outdoors around Monday, May 4, 2026.

What is the last frost date for Mesa, Idaho? +

The average last spring frost date for Mesa, Idaho (ZIP 83643) is around Monday, April 20, 2026. This is based on NOAA climate normals for USDA Zone 6a.

How long does Echinacea (Coneflower) take to grow? +

Echinacea (Coneflower) typically matures in about 365 days from transplanting. In Mesa, that means you can expect harvest around Monday, May 4, 2026 plus 365 days.

Should I start Echinacea (Coneflower) indoors or direct sow in Idaho? +

Echinacea (Coneflower) should be started indoors 10 weeks before your last frost date. In Mesa, that means starting around Monday, February 9, 2026.

Other Plants for Mesa

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Growing Echinacea (Coneflower) in Zone 6a

Echinacea (Coneflower) (Echinacea purpurea) is a popular garden vegetable. In Mesa, Idaho, which is in USDA Hardiness Zone 6a, you should start seeds indoors around Monday, February 9, 2026.

Your average last frost date is Monday, April 20, 2026. Plan to transplant your Echinacea (Coneflower) seedlings outdoors around Monday, May 4, 2026, about 2 weeks after your last frost date.